Tools & Calculators
A catalog of trade calculators for field checks, shop math, and planning estimates. Search by work, material, standard, or category.
Electrical
35 live toolsBranch-circuit and feeder screening against NEC table data: wire sizing, panel load studies, generator sizing, and code translators.
Showing Electrical tools. 35 shown.
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35 toolsABB ACS Drive Type-Code Decoder
Decode an ABB ACS drive type designation (ACS180, ACS355, ACS380, ACS480, ACS580, ACS880) into output current I2N, max current Imax, Normal-Duty and Heavy-Duty motor power (kW and HP), frame size, voltage class, enclosure, and +options. Reads the rating from ABB's published tables and flags when a current code does not exist at the entered voltage.
Available Fault Current Estimator
Calculate available fault current at any point in an electrical system. Point-to-point method for breaker AIC rating using transformer kVA, impedance, and wire run length.
Battery Energy Storage System (BESS) Sizing Calculator
Size commercial battery storage for peak shaving, TOU arbitrage, solar self-consumption, and backup with degradation modeling, IRA ITC analysis, and LCOS.
Cable Tray Fill Calculator (NEC 392)
Calculate cable tray fill per NEC Article 392 for ladder, ventilated trough, solid bottom, and channel trays. Multi-conductor and single-conductor rules.
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.
Conduit Bending Calculator
Conduit bending calculator for EMT and rigid conduit. Benfield method for offsets, saddles, stub-ups, and back-to-back 90s. Shrink, multipliers, and marks.
Danfoss VLT Drive Decoder
Decode a Danfoss VLT FC type code (FC 301/302 AutomationDrive, FC 102 HVAC, FC 202 AQUA, FC 51 Micro Drive) into motor kW/HP, captured output currents, voltage class, and frame size. FC 102 current coverage is incomplete and flagged in the result. The power code is a kW key (PK75 = 0.75 kW, P11K = 11 kW), not a current, and the decoder rejects power/voltage combinations that are not cataloged instead of fabricating a number.
Data Center Power & Cooling Load Calculator
Calculate electrical power requirements and cooling loads for data center spaces with PUE estimation, redundancy planning, and carbon footprint analysis.
EV Charger Load & Panel Fit Check
Determine if your electrical panel can support an EV charger installation. Calculates NEC demand load, continuous load 125% sizing, wire sizing with voltage drop, and shows panel pass/marginal/fail with upgrade options including NEC 625.42 energy management.
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.
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.
Grounding Electrode System Calculator
Calculate ground resistance for single rods, parallel rods, ground rings, and ground grids using Dwight's formulas per IEEE 142. Includes soil resistivity reference and NEC 250 pass/fail check.
Hazardous Area Code Translator
Decode a NEC Class/Division marking, an IEC/IECEx Ex string, or an ATEX marking, and translate between the systems. Surfaces the reversed gas-group lettering (NEC Group A is IEC IIC) and the lossy or ambiguous hops most cross-references hide.
Hazardous Location Classification Guide
Interactive decision-tree for NEC Article 500 (Class/Division) and Article 505 (Class/Zone) hazardous location classification. Identifies Group, T-code, and equipment requirements from the material present.
Junction Box Fill Calculator
NEC 314.16 junction box fill calculator. Count conductors, devices, and clamps to check cubic inch capacity. Avoid failed rough-in inspections.
Lighting Design / Foot-Candle Calculator
Calculate fixture count using the IES lumen method with Room Cavity Ratio, Coefficient of Utilization, and light loss factors. Includes IES illuminance targets for 15 space types, LED retrofit comparison, and IECC energy code compliance checks.
Motor FLA Lookup (NEC 430)
NEC Table 430.248 and 430.250 motor full-load current lookup with overload sizing, breaker/fuse sizing per 430.52, and wire sizing per 310.16.
Motor Starting Current / Code Letter Calculator
Convert NEC code letters (A through V) to locked-rotor starting amps. Starting-to-running ratio and starter recommendation for any motor.
Motor Starting Voltage Drop Calculator
Screen motor-start terminal voltage drop with local code-letter, transformer, and cable rows plus IEEE 3002.7, NEC/NEMA, utility, AHJ, and safe-work review boundaries.
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.
NEMA Plug & Receptacle Reference
Interactive source-aware screen for common local NEMA plug and receptacle rows. Filter by voltage, amperage, grounding, and locking style while keeping WD 6, UL/listing, NEC, and AHJ gaps visible.
Ohm's Law / Power Wheel Calculator
All 12 Ohm's Law and Watt's Law relationships for DC, single-phase AC, and three-phase AC. Power triangle visualization with kW, kVA, kVAR, and power factor.
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.
Power Factor Correction Calculator
Calculate capacitor bank sizing for power factor correction with cost savings analysis.
PowerFlex Drive Decoder
Decode an Allen-Bradley / Rockwell PowerFlex catalog number into output current, Normal-Duty motor HP/kW, voltage class, frame, enclosure, and options. Handles both the dash-delimited 520-series (523 = 25A, 525 = 25B) and the fixed 18-character 750-series (753 = 20F, 755 = 20G, 755 with Options = 21G), and flags when a code, voltage, or frame combination is not a real drive.
Residential Electrical Load Calculator (NEC 220)
Calculate residential electrical service size using NEC 220.82 (new construction) and 220.83 (existing dwelling additions). Step-by-step demand breakdown with HVAC exclusive rule, EV charger loads, conductor sizing for copper and aluminum.
Square D Breaker Decoder
Decode a Square D QO / QOB / Homeline circuit-breaker catalog number (QO120, QO230, HOM250) into poles, amperage, voltage, and interrupting rating (AIC). The AIC is read from the Schneider interrupting-rating matrix on the full code: standard QO/QOB/HOM = 10 kA, QO-VH = 22 kA, QOH = 42 kA, QH = 65 kA, and a lone H on a 2-pole QO is a 240 Vac common-trip device that is still 10 kA. A combination not in the matrix is flagged needs-source, never guessed; PowerPacT/I-Line are out of scope. Always verify against the breaker label.
Torque to Horsepower Converter
Convert between torque and horsepower (or kW). HP = (T x RPM) / 5252. Includes efficiency chain, gearbox ratios, and quick reference table.
Transformer Fault Current Calculator
Available fault current at transformer secondary and downstream points. Point-to-point method with AIC rating recommendation.
Transformer Loss Evaluation (TOC) Calculator
Calculate total owning cost of transformers using the A and B factor method per IEEE C57.120. Compare up to 3 units with DOE 2016 efficiency checks.
Transformer Protection Calculator
Size transformer overcurrent protection per NEC 450.3. Primary and secondary fuse or breaker sizing for single-phase and three-phase transformers up to 1000V.
VFD Cross-Reference
Cross-reference a variable frequency drive across ABB ACS, Allen-Bradley PowerFlex, Yaskawa, and Danfoss VLT. Enter one drive by model code or by parameters (phase, voltage, motor kW/HP, duty, optional current) and get the closest equivalents in the other brands, matched on the electrical envelope with every difference shown. A sourcing starting point, not a certified drop-in: it does not verify dimensions, wiring, controls, safety, firmware, or approvals.
Wire & Cable Type Decoder
Decode a wire or cable marking (THWN-2, XHHW-2, SOOW, MC, NM-B, TC-ER, USE-2) into temperature ratings, ampacity basis, permitted locations, construction, and the governing UL standard. Built around the "-2" wet-rating trap and the NEC 110.14(C) termination ampacity gap.
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.
Yaskawa Drive Decoder
Decode a Yaskawa AC drive code into Heavy-Duty and Normal-Duty output current, motor HP/kW, voltage class, EMC filter, and enclosure. Full 7-position decode for GA500 (CIPR-GA50U...) and GA800 (CIPR-GA80U...); legacy A1000 (CIMR-A...) and V1000 (CIMR-V...) are recognized and their ratings returned. Ratings are keyed on family plus model because the same model token (e.g. 2030) carries a different kW on the GA500 than on the GA800.
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