Tools & Calculators
Practical online tools built for trade professionals and DIYers. All calculators run directly in your browser - no sign-ups, no ads, no data selling.
All Tools
Air Compressor Leak Calculator
Find out how much compressed air leaks cost your facility per year. Enter leak count, system pressure, and electricity rate to see CFM losses, kW waste, and annual dollars wasted.
Can I Run This On That?
Check if your circuit breaker and wiring can handle a specific appliance. Enter breaker size, wire gauge, and load wattage for a pass/fail verdict based on NEC standards.
Wire Sizing Calculator
Find the right AWG wire gauge for any electrical run. Enter amps, distance, and voltage to get NEC-compliant sizing with derating, voltage drop, and copper vs aluminum cost comparison.
Generator Sizing Calculator
What size generator do you need? Add your appliances and loads to calculate total running watts and starting surge. Get a recommended generator size with built-in headroom.
Lockout/Tagout Permit Manager
Create OSHA-compliant LOTO permits for equipment energy isolation. Track electrical, pneumatic, hydraulic, and thermal energy sources with lock assignments and zero-energy verification.
Local SEO Foundry
Plan and track your local SEO strategy. Manage business citations, review profiles, NAP consistency, and Google Business Profile optimization for contractors and local service businesses.
DIY Project Plan Builder
Step-by-step build plans for mini-split installs, generator setups, shop heaters, outbuilding wiring, and water heater replacements. Get sized tool and material lists based on your calculator results.
Shift Schedule Generator
Generate DuPont, Pitman, 4-on-4-off, and Continental shift calendars with built-in pay and overtime calculator. See your gross earnings per pay period, customize crew colors, download printable PDF schedules, and export ICS calendar files.
Crew Rotation Visualizer
See all crews on one timeline. Visualize multi-crew shift coverage across days, weeks, and months. Spot handoff gaps, compare rotation patterns, export PDF timelines, and download ICS calendar files. Built for operations managers and plant schedulers.
Mini-Split Efficiency & Cost Calculator
Is your mini-split cheaper than propane right now? Enter your electric rate and fuel prices to find the exact outdoor temperature where your heat pump stops saving money and your backup heat wins.
Heat Load from Bills Calculator
What size furnace or heat pump do you actually need? Skip the $300 Manual J - estimate your home's BTU/hr heat load from your gas, propane, or electric bills. See how your home compares by age and climate zone.
Heating Bill ROI Calculator
Will a heat pump pay for itself? Enter 12 months of heating bills to see payback period, annual savings, and NPV analysis. Uses HDD regression and real COP curves for accurate projections.
HVAC System Analyzer
6 HVAC calculators in one tool: cost per BTU, heat load, ventilation/ACH, switchover temp, duct sizing, and room CFM balancing. Built for technicians, contractors, and serious DIYers.
Energy Efficiency Calculator
Compare heat pump vs propane, gas, and oil costs at every temperature. Full bilingual English/Spanish mini-split cost calculator. Tambien disponible en espanol.
Compressed Air System Sizing & Cost Calculator
Size your shop air compressor based on real tool CFM demand with duty cycles. Get HP recommendations, pipe sizing, receiver tank sizing, and true 5-year operating cost comparison.
Concrete Volume Calculator
Calculate how many cubic yards of concrete to order. Accounts for overdig, pour-specific waste factors, and short load fees. Supports slabs, footings, walls, columns, and steps.
Panel Load Study
Do you actually need a panel upgrade? Walk your breaker panel with NEC Article 220 demand factors. See connected load vs. calculated demand and test whether an EV charger, heat pump, or hot tub fits.
Grain Bin Capacity Calculator
Calculate bushel capacity for flat-bottom and hopper-bottom grain bins. Enter diameter, eave height, and commodity to get level fill, peaked fill, and partial fill volumes with weight estimates.
Grain Moisture Shrink Calculator
Calculate physical grain shrink from drying vs. elevator-applied shrink. See the hidden margin in your elevator's shrink factor and the dollar impact at current commodity prices.
Grain Drying Cost Estimator
Calculate on-farm grain drying cost per bushel including fuel, shrink, and labor. Compare against elevator docking charges to find the cheaper option for your operation.
Auger & Conveyor Sizing Calculator
Find the right auger diameter for your target bushels per hour. See capacity derating by angle and commodity, HP requirements, and time to fill a bin.
Fertilizer Blend & Cost Calculator
Compare fertilizer products by cost per pound of actual nutrient delivered. Build custom blends, see excess nutrient waste, and generate printable blend tickets for dealer negotiation.
Field Operation Cost-Per-Acre Calculator
Calculate the true cost per acre for any field operation. Compare owning equipment vs. custom hiring with breakeven analysis. Includes fuel, labor, wear parts, and depreciation.
Irrigation Pump & Pipe Sizing Calculator
Size irrigation pumps and pipes using Hazen-Williams friction loss calculations. Get total dynamic head, required pump HP, flow velocity checks, and energy cost estimates.
PTO & Drawbar Power Budget Calculator
Calculate available PTO and drawbar horsepower for your tractor-implement combination. See the chain of efficiency losses from engine to ground and get a clear pass/fail match verdict.
Bulk Fuel Storage & Consumption Planner
Size your on-farm fuel tanks based on peak seasonal consumption. Get reorder points, delivery schedules, DEF requirements, and annual fuel cost projections for your equipment fleet.
Electrical Load Panel Planner - Farm/Ag
Size electrical service for farm shops, grain handling, and livestock buildings using NEC Article 220 demand factors. Includes motor FLA lookup, conductor sizing, and transformer kVA recommendation.
Chemical Dosing Calculator
Calculate gallons per day or pounds per day of chemical feed for any water or wastewater treatment process. Supports chlorine, alum, ferric chloride, polymer, lime, caustic, permanganate, and fluoride with automatic unit conversions and metering pump settings.
Detention Time Calculator
Calculate hydraulic detention time for any basin, tank, or lagoon and check against regulatory minimums. Supports rectangular and circular tanks with dead zone correction for actual vs theoretical retention time.
Disinfection CT Value Calculator
Calculate CT values for chlorine disinfection and verify EPA Surface Water Treatment Rule compliance. Check Giardia and virus log inactivation credits based on residual, contact time, temperature, and pH.
Water Tower Storage Sizing Calculator
Size elevated water storage based on fire protection, peak demand, and emergency reserve requirements. Follows AWWA guidelines for small water systems and rural water districts with standard tank size recommendations.
Pump Energy Cost Calculator
Calculate actual operating cost for any water or wastewater pump based on flow, head, efficiency, and runtime. Includes VFD retrofit savings analysis with simple payback and 10-year projection.
Clarifier Loading Rate Calculator
Calculate surface overflow rate, solids loading rate, and weir overflow rate for primary and secondary clarifiers. Check against design standards and model one-out-of-service scenarios.
Aeration Energy Cost Calculator
Calculate blower energy consumption and annual operating cost for wastewater aeration basins. Compare blower technologies and estimate savings from DO control optimization and VFD retrofits.
Lift Station Runtime & Backup Power Calculator
Calculate pump cycles, runtime hours, backup generator sizing, and time to overflow for any lift station. Size generators for emergency power and estimate fuel consumption during outages.
Sludge Production & Disposal Cost Calculator
Estimate daily sludge production, dewatered volume, and annual disposal cost for any wastewater treatment plant. Compare disposal methods including land application, landfill, and incineration.
Lagoon & Stabilization Pond Sizing Calculator
Size facultative and aerated lagoons based on organic loading, climate zone, and detention time requirements. Includes earthwork estimates, aeration power requirements, and design standard compliance checks.
Fuel Combustion Emissions Calculator
Calculate CO2, NOx, SOx, and PM emissions from fuel combustion using EPA AP-42 emission factors. Supports natural gas, propane, diesel, fuel oil, and coal with annual emissions totals and cost-per-ton estimates.
Refrigerant Leak CO2 Equivalent Calculator
Calculate CO2 equivalent emissions from refrigerant leaks using EPA GWP values. Supports R-410A, R-134a, R-22, R-404A, R-407C, R-32, R-1234yf, and more. See annual GHG inventory impact in metric tons CO2e.
Boiler Efficiency & Stack Loss Calculator
Calculate boiler combustion efficiency from stack temperature and flue gas analysis. See stack heat loss, excess air percentage, and annual fuel savings from tuning. Supports natural gas and oil-fired boilers.
Natural Gas vs Propane Emissions Calculator
Compare CO2, NOx, and total emissions between natural gas and propane for heating and process applications. See emissions per MMBtu delivered and annual totals based on your usage.
Title V Permit Fee Calculator
Estimate annual Title V air permit fees based on actual pollutant emissions. Enter tons per year of each regulated pollutant to calculate state permit fees with major source threshold checks.
VOC Emissions from Coating Calculator
Calculate VOC emissions from paint, primer, and coating operations. Accounts for transfer efficiency, capture systems, and control devices. Supports conventional spray, HVLP, electrostatic, and dip applications.
Stack Opacity to PM Estimator
Estimate particulate matter emissions from visible stack opacity readings. Convert Method 9 opacity observations to approximate PM emission rates using EPA correlation methods.
Diesel Fuel Sulfur & Emissions Calculator
Calculate SOx emissions from diesel fuel based on sulfur content. Compare ULSD, off-road, and heating oil grades. See annual sulfur dioxide emissions and fleet-level environmental impact.
Concrete Batch Plant Dust Emissions Calculator
Estimate particulate matter emissions from concrete batch plant operations using EPA AP-42 Chapter 11.12 factors. Calculate PM10 and PM2.5 from material handling, truck loading, and storage piles with control efficiency.
Emergency Generator Emissions Calculator
Calculate emissions from emergency and standby diesel generators. Check RICE NESHAP compliance with runtime hour tracking, non-emergency use limits, and annual emissions totals for permit applications.
Shop Heater BTU Sizing Calculator
Calculate the exact BTU output your shop or garage heater needs. Factors in wall R-values, ceiling insulation, slab edge loss, overhead door infiltration, and air changes per hour to size propane, natural gas, and electric heaters correctly.
Overhead Door Infiltration Loss Calculator
Calculate heat loss through overhead doors in shops, garages, and warehouses. Compares open-door vs closed-door losses, seal condition impact, and annual cost of infiltration with payback on door seals and high-speed doors.
Long-Run Voltage Drop Calculator
Calculate voltage drop for long wire runs to detached shops, barns, garages, and outbuildings. Compares copper vs aluminum, shows motor starting voltage impact, and recommends the right wire size for your distance and load.
Well Pump Electrical & Sizing Calculator
Size your well pump system including total dynamic head, wire gauge for the pump run, breaker sizing per NEC 430, and pressure tank selection. Calculates annual energy cost and shows wire schedule for deep well installations.
Concrete Slab Heat Loss Calculator
Calculate heat loss through concrete slab-on-grade floors. Uses edge loss and full-slab methods with perimeter F-factors, insulation R-values, and heating degree days to estimate annual cost and insulation payback.
Shop Air Compressor Sizing Calculator
Size your shop air compressor based on actual tool usage. Enter your air tools, duty cycles, and simultaneous usage to get required CFM, tank size, and compressor type recommendation. Compares reciprocating vs rotary screw options.
Pole Barn Snow Load Calculator
Calculate roof snow loads for pole barns, post-frame buildings, and metal buildings using ASCE 7 methods. Accounts for ground snow load, exposure, thermal factor, roof slope reduction, and leeward drift loads.
Generator Backfeed Safety Checker
Check if your generator setup is safe from backfeed risk. This decision-tree tool evaluates your transfer switch, connection method, and safety equipment against NEC Article 702 requirements and flags dangerous configurations.
Livestock Barn Ventilation Calculator
Calculate ventilation rates for livestock barns by animal type and season. Covers dairy, beef, swine, and poultry with CFM per head, fan sizing at actual static pressure, and multi-stage ventilation planning from winter minimum to summer tunnel mode.
Machine Shop Power Budget Calculator
Calculate total connected load and demand for your machine shop. Enter lathes, mills, welders, grinders, plasma tables, and compressors to determine service size, panel capacity, and whether you need single-phase or three-phase power.
Speeds & Feeds Calculator
Calculate optimal RPM and feed rate for milling and drilling operations. Select material and tool diameter to get recommended cutting speeds, chip load, and material removal rate with risk tier classification.
Weld Heat Input Calculator
Calculate weld heat input per AWS D1.1 and ASME Section IX. Enter amperage, voltage, and travel speed to get kJ/in and kJ/mm with process efficiency correction and risk tier classification by material type.
Drill & Tap Calculator
Two-in-one drill and tap calculator. Get drilling RPM and feed rates for any drill size, plus tap drill sizes with thread percentage for UNC, UNF, and Metric threads. Includes comprehensive thread data tables.
Fillet Weld Strength Calculator
Check fillet weld adequacy per AWS D1.1 structural welding code. Enter weld size, length, electrode class, and applied load to verify utilization ratio, minimum/maximum weld sizes, and safety margin.
MIG/TIG Gas Consumption Estimator
Estimate shielding gas consumption for MIG and TIG welding. Calculate cylinder life, cost per shift, and bulk vs cylinder savings based on flow rate, arc-on time, and pre/post flow waste.
Lathe Turning Calculator
Calculate RPM, feed rate, cutting time, and surface finish for lathe turning operations. Supports OD turning, facing, boring, and parting with material-specific SFM data and horsepower estimation.
Metal Removal Rate Calculator
Calculate metal removal rate, machining time, and horsepower requirements for milling, turning, and drilling. Estimate job time and machine utilization with material-specific cutting energy data.
Bolt Torque Calculator
Calculate recommended torque values for bolts by size, grade, and lubrication. Covers SAE Grade 2/5/8, ASTM A325/A490, and Metric 8.8/10.9/12.9 with adjustable clamp load percentage and quick reference table.
Bearing Speed Limit Checker
Check bearing speed against conservative ndm limits by bearing type and lubrication method. Get OK/CAUTION/HIGH risk classification with maximum safe RPM for your configuration.
Basic L10 Bearing Life Calculator
Calculate L10 bearing life in hours and years from dynamic load rating C and equivalent load P. Includes reliability-adjusted L10a for 95% and 99% confidence levels.
Equivalent Dynamic Load Calculator
Calculate equivalent dynamic bearing load P from radial and axial forces. Supports deep groove, angular contact, cylindrical roller, self-aligning, and spherical roller bearings with correct X and Y factors.
Bearing Grease Speed Factor Guide
Check grease suitability for bearing speed and temperature. Get regreasing interval estimates based on ndm speed factor, NLGI grade, base oil viscosity, and operating environment.
Press Fit / Clearance Checker
Verify shaft-to-bore fit against ISO/ANSI tolerance classes. Enter measured shaft and bore diameters to check interference, clearance, and assembly method recommendations.
Thermal Growth Fit Impact Calculator
Calculate thermal expansion of shafts and housings and see the impact on bearing fit. Enter material, dimensions, and temperature change to see dimensional growth and resulting hot-running fit.
Bearing Puller Force Estimator
Rule-of-thumb estimator for bearing removal and installation press force. Enter bearing size, fit tightness, and engagement length to get force estimate with tool recommendations.
Bearing Failure Symptom Triage
Diagnose bearing problems from observed symptoms, noise, vibration data, and visual inspection. Rule-based diagnostic tool that identifies likely causes and recommends corrective actions.
Belt Drive & Sheave Calculator
Calculate belt drive speed ratios, sheave diameters, belt speed in FPM, and approximate belt length. Includes V-belt cross-section reference with minimum sheave diameters.
Pump Affinity Laws Calculator
Calculate the effect of speed changes or impeller trim on pump flow, head, and power using the affinity laws. Includes energy cost savings for VFD applications.
Motor Slip & RPM Calculator
Calculate motor slip percentage, synchronous speed, and actual RPM from nameplate data. Includes NEMA design letter reference and RPM vs load table.
Pipe Pressure Drop Calculator
Calculate pressure drop in pipes using Darcy-Weisbach equation with Swamee-Jain friction factor. Supports steel, copper, PVC, and stainless pipe with fitting equivalent lengths.
Heat Exchanger Duty Calculator
Calculate heat exchanger duty (Q), LMTD, and required UA value. Supports counterflow and parallel flow with water and glycol fluids.
Material Hardness Converter
Convert between Rockwell C (HRC), Rockwell B (HRB), Brinell (HB), Vickers (HV), and approximate tensile strength using ASTM E140 conversion data.
Pipe Schedule Quick Reference
Searchable pipe dimension reference table for NPS 1/2" through 12". Schedule 10, 40, 80, and 160 with OD, wall, ID, flow area, and weight per foot.
Motor Nameplate Decoder
Decode every field on an electric motor nameplate. Verify FLA against HP and voltage, look up NEMA frame dimensions, get wire sizing per NEC 430.
Bolt Torque-Tension Calculator
Calculate bolt preload from applied torque using K-factor method. Covers lubricated, dry, and anti-seize conditions.
Vibration Severity Checker
Assess machine vibration severity per ISO 10816. Enter velocity readings and get zone classification with maintenance recommendations.
Coupling Alignment Calculator
Look up offset and angularity tolerances by coupling type. Covers jaw, gear, disc, grid, and elastomeric couplings.
Lubrication Interval Calculator
Calculate bearing regreasing intervals using SKF method. Accounts for speed, temperature, contamination, and bearing type.
Motor Efficiency & Loading Calculator
Assess motor loading percentage, efficiency at actual load, and annual energy savings from right-sizing or upgrading.
Flange Bolt Pattern Reference
ASME B16.5 flange bolt count, diameter, and torque reference by pipe size and pressure class.
Relief Valve Sizing Calculator
Size pressure relief valves per API 520. Calculate required orifice area for gas, steam, and liquid service.
Crane & Rigging Calculator
Calculate sling tension, angle factors, and working load limits for multi-leg rigging configurations.
NEC Conduit Fill Calculator
Calculate NEC Chapter 9 conduit fill for mixed conductor types. Check percent fill against code limits, get violation flags, and find the next size up recommendation.
Electrical Service & Transformer Sizing Calculator
Size transformers using NEC Article 220 demand factors. Enter your load inventory to calculate demand kVA and select the standard transformer size for single-phase or three-phase service.
Hydraulic Cylinder Force & Speed Calculator
Calculate hydraulic cylinder extend and retract force, speed, GPM requirements, and Euler rod buckling safety factor for any bore, rod, pressure, and flow combination.
Compressed Gas Cylinder Duration Calculator
Calculate how long a compressed gas cylinder will last at a given flow rate. Covers standard sizes (R, K, T, S), common gases, and multi-cylinder job planning.
Pipe Heat Trace Calculator
Calculate heat loss per foot from pipe geometry and insulation, determine watts per foot required, total wattage, and breaker sizing for self-regulating or constant-watt heat trace cable.
Mechanical Insulation Thickness Calculator
ASTM C680 method for pipe and equipment insulation. Calculate thickness, heat loss BTU/hr, surface temperature, and condensation risk for various insulation types.
Scaffold Load & Tie Calculator
OSHA 1926.451 scaffold loading calculator. Determine platform capacity, leg loads, mudsill sizing, and tie spacing for light, medium, and heavy-duty scaffolding.
Storm Drain Pipe Sizing Calculator
Size storm drain pipes using the Rational Method (Q=CiA) and Manning's equation. Calculate required pipe diameter, flow velocity, and pipe capacity for stormwater drainage.
Roof Drainage & Gutter Sizing Calculator
Size gutters and downspouts based on roof area, pitch, and rainfall intensity. Calculate required gutter size, downspout count, and maximum run length per IPC/UPC methods.
Fleet PM Cost Calculator
Calculate preventive maintenance costs for your fleet. Enter vehicle types and usage to see PM intervals, service costs, and compare in-house vs outsourced maintenance.
Concrete Mix Design Calculator
ACI 211.1 concrete mix design step by step. Enter target strength, exposure class, and aggregate properties to get w/c ratio, mix proportions per cubic yard, and batch weights.
Fire Sprinkler Hydraulic Calculator
NFPA 13 sprinkler hydraulic calculator. Compute flow using K-factor, Hazen-Williams friction loss in piping, and total system demand at the riser with hose stream allowance.
4-20 mA Signal Helper
Convert between 4-20 mA signals and process values. Build scaling tables, check for loop faults, and verify transmitter calibration.
I/P Converter Sanity Checker
Verify I/P converter output against expected values. Check mA input vs PSI output, diagnose drift, and flag high-deviation converters.
Pneumatic Cylinder Force Calculator
Calculate extend and retract force for pneumatic cylinders. Includes practical force with friction factor, differential area, and air consumption in SCFM.
Instrument Air Line Sizing Calculator
Size instrument air tubing and piping using Harris formula. Compare copper, black iron, and stainless options with pressure drop and velocity checks.
Control Valve Cv / Flow Estimator
Calculate required valve Cv for liquid, gas, and steam service. Detect choked flow conditions and estimate valve size from standard Cv tables.
Valve Stroke Time Calculator
Calculate pneumatic valve stroke time from actuator volume, supply pressure, and system Cv. Identifies undersized tubing and slow-stroking valves.
Valve Actuator Sizing Check
Verify actuator torque or thrust against valve requirements. Covers butterfly, ball, globe, and plug valves with safety factor and fail-safe spring check.
Instrument Air Cost & Leak Impact
Calculate the cost of compressed air leaks and their impact on instrument air reliability. Prioritize leak repairs by annual savings and reliability risk.
Pneumatic Troubleshooter Assistant
Diagnose pneumatic control valve and actuator problems from observed symptoms. Rule-based diagnostic engine with severity-ranked results and field check recommendations.
PID Loop Quick Visualizer
Simulate PID controller step response with adjustable tuning parameters. Visualize overshoot, settling time, and stability with real-time Canvas-based charts.
Gas Pipe Sizing Calculator
Size natural gas piping per IFGC/IRC using the Spitzglass formula. Select appliances, pipe material, and run length to find minimum pipe diameter.
Water Heater Sizing Calculator
Size residential and light-commercial water heaters. Calculate first-hour rating, recovery rate, tank size, and compare energy costs across fuel types.
Fixture Unit Calculator
Calculate water supply fixture units (WSFU) per IPC/UPC and convert to peak GPM demand using Hunter's Curve. Determine minimum pipe size for water supply systems.
PM Interval Optimizer
Optimize preventive maintenance frequency using Weibull reliability analysis and cost-risk modeling. Find the interval that minimizes total maintenance cost.
Spare Parts Reorder Calculator
Calculate reorder points, safety stock, and economic order quantities for MRO spare parts. Uses Poisson distribution for slow-moving items and normal distribution for fast-movers.
Trades Unit Converter
Purpose-built unit converter for trades and industrial workers. Convert pressure, flow, temperature, torque, length, water chemistry, and electrical units including niche conversions like inWC to PSI and grains/gallon to ppm.
Chip Load Calculator
Calculate chip load per tooth for milling, drilling, and turning. Forward and reverse modes with material-specific recommendations, chip thinning factor, and MRR. Metal and wood modes.
Thread Pitch Identifier
Identify unknown threads from caliper measurements. Cross-references UNC, UNF, Metric ISO, NPT, BSP, and ACME thread standards with tolerance matching and confidence scoring.
Tolerance & Fit Calculator
ISO 286 tolerance zone calculator for shaft/hole fits. Calculates clearance, transition, and interference fits with visual tolerance zone diagram and common fit presets (H7/g6, H7/h6, H7/p6, etc.).
Material Weight Calculator
Calculate weight of metal stock in 9 shapes: round bar, tube, square, hex, sheet, angle iron, and more. 16 materials with cut list builder and cost estimator.
Taper & Angle Calculator
Calculate tapers, sine bar heights, tailstock offsets, and angle conversions. Includes Morse taper and Brown & Sharpe reference tables with full DMS angle output.
Bolt Circle Calculator
Generate X/Y hole coordinates for bolt circle patterns. DRO-ready output with multiple pattern support, interactive SVG diagram, incremental coordinates, and G-code generation.
Wood Speeds & Feeds Calculator
CNC router speeds and feeds calculator for wood, plywood, MDF, acrylic, and composites. Router presets (DeWalt 611, Makita), tool type selection, burn/chip-out warnings, and DOC recommendations.
Board Foot Calculator
Calculate board feet for rough and surfaced lumber. Quarter-thickness presets (4/4-16/4), cut list builder, species pricing reference, waste factor, and weight estimation for 10 hardwood and softwood species.
Solar Array Sizing Calculator
Size your solar panel array from daily kWh load, peak sun hours by region, system losses, and tilt derating. Grid-tied and off-grid modes with monthly production estimates.
Battery Bank Sizing Calculator
Size lead-acid or LiFePO4 battery banks for off-grid and backup solar systems. Accounts for depth of discharge, days of autonomy, temperature derating, and battery configuration.
DC Wire Sizing Calculator
Calculate wire gauge and voltage drop for 12V, 24V, and 48V DC circuits. Solar PV, RV, marine, and automotive applications with NEC ampacity verification and cost estimates.
Charge Controller Sizing Calculator
Size MPPT and PWM solar charge controllers per NEC 690.7. Cold-weather Voc correction, string configuration, and common controller size recommendations.
Inverter Sizing Calculator
Match inverter capacity to your load and battery system. Appliance load builder with surge ratings, DC current draw, efficiency curves, and battery drain estimation.
Solar ROI & Payback Calculator
Calculate solar payback period, NPV, IRR, and lifetime savings. Includes federal ITC, rate escalation, panel degradation, financing options, and 25-year cash flow analysis.
Superheat & Subcooling Calculator
Calculate superheat and subcooling for HVAC/R system diagnostics. Supports R-410A, R-22, R-134a, R-404A, R-407C, R-32, and R-290 refrigerants with saturation temperature lookup from measured pressures.
Psychrometric Calculator
Calculate psychrometric properties from any two known values. Dry bulb, wet bulb, dew point, relative humidity, humidity ratio, enthalpy, and specific volume. ASHRAE standard correlations.
Duct Sizing Calculator
Size round and rectangular ductwork from CFM airflow and friction rate. Equal friction method with Darcy-Weisbach pressure drop. Round-to-rectangular equivalent calculations.
Horizontal Tank Volume Calculator
Calculate liquid volume in horizontal cylindrical tanks from fluid depth (dipstick reading). Supports flat, ellipsoidal, and hemispherical heads. Gallon and liter output.
Steam Properties Calculator
Look up saturated and superheated steam properties. Temperature, pressure, specific volume, enthalpy, entropy for water and steam. IAPWS-IF97 polynomial approximations.
Stair Stringer Calculator
Calculate riser height, tread depth, stringer length, and layout dimensions per IRC R311.7 code requirements. Includes stringer cut diagram and material list.
Markup vs Margin Calculator
Convert between markup percentage and profit margin. Calculate selling price from cost and desired markup or margin. Includes breakeven analysis and pricing tables.
Hourly Burden Rate Calculator
Calculate true hourly labor cost including wages, benefits, payroll taxes, insurance, overhead, and utilization rate. Essential for job costing and bid pricing in the trades.
Bend Deduction & K-Factor Calculator
Calculate bend allowance, bend deduction, K-factor, and flat pattern length for sheet metal bending. Supports air bending, bottoming, and coining with common materials.
Sheet Metal Weight & Cost Calculator
Calculate sheet metal weight from gauge thickness, dimensions, and material type. Supports steel, stainless, aluminum, brass, and copper with gauge-to-thickness conversion tables.
Asphalt Tonnage Calculator
Calculate tons of hot mix asphalt from paving area, lift thickness, and mix density. Includes waste factor, truck load planning, and cost estimation.
Concrete Rebar Spacing Calculator
Calculate rebar count, spacing, lap splice length, and development length per ACI 318. Supports #3 through #11 bars with clear cover requirements.
Weld Joint Prep Calculator
AWS D1.1 prequalified groove weld joint dimensions. Bevel angle, root opening, root face, groove angle, and effective throat for V, bevel, J, and U groove joints.
Pipe Thread Sealant Guide
Select the correct pipe thread sealant based on thread type, pipe material, fluid service, pressure, and temperature. Covers Teflon tape, pipe dope, anaerobic compounds, and PTFE paste.
Advanced Tap Drill Calculator
Calculate tap drill sizes for any thread engagement percentage (50-85%) with full drill cross-reference in fractional, number, letter, and metric systems. UNC, UNF, and Metric threads.
Counterbore & Clearance Hole Calculator
Calculate clearance hole, counterbore, and countersink dimensions for socket head and hex cap screws. ASME B18.2, ISO 273, close/normal/loose fit. Inch and metric.
Clamping Force Calculator
Calculate workpiece clamping force from bolt torque, stud size, and friction coefficient. Yield strength safety check with visual warning system. SAE and metric bolt grades.
Smart Drill Size Finder
Find any drill size instantly. Convert between fractional, letter, number, and metric drill sizes. Shows nearest alternatives in every system with tolerance from exact.
Surface Finish (Ra) Calculator
Calculate theoretical surface finish Ra from feed rate and tool nose radius. Forward and reverse modes with standard callout comparison chart. Turning, milling, and boring.
AISI/SAE Steel Grade Decoder
Decode AISI/SAE steel grades instantly. Alloy composition, machinability rating, heat treatment notes, weldability, and typical applications for 40 common carbon, alloy, and tool steels.
Machinability Comparison Tool
Compare machinability ratings, SFM ranges, and chip loads for 30+ metals. Filter by material category, operation type, and tooling. Interactive sortable reference.
Pipe Thread Dimension Calculator
Calculate NPT, NPTF, BSPT, and BSPP pipe thread dimensions. Tap drill sizes, taper rates, effective thread length, and pitch diameters for 1/8 through 4 inch pipe.
GD&T Quick Reference
Interactive GD&T reference for all 14 geometric tolerances per ASME Y14.5. Plain-English explanations, feature control frames, inspection methods, and common mistakes.
CNC G-Code Quick Reference
Searchable CNC G-code and M-code reference. Generic descriptions, syntax examples, and mill vs lathe applicability for 70+ codes. Controller-agnostic per ISO 6983.
Job Setup Sheet Generator
Generate CNC job setup sheets with automatic speed, feed, and MRR calculations. Printable shop floor documents with chipload verification, workholding, and coolant notes.
Shop Math Worksheet
Combine tap drill, counterbore, material grade, and hardness calculations into one printable machine shop worksheet. All math free — professional PDF export.
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