Chipper Throughput & Truck Capacity Calculator

Free chipper throughput calculator for tree service companies, land clearing contractors, and arborist crew leaders who need to estimate how long it will take to process a job's brush and log material and how many chip truck loads will be generated. Enter the chipper type (drum or disc), maximum diameter capacity, estimated feed rate, and the volume of material to process. The calculator returns the throughput in cubic yards of chips per hour, the time to fill a chip truck, and the total number of truck loads for the job.

Chipper throughput directly affects crew productivity and job profitability. A 12-inch capacity disc chipper processing limb wood at a steady feed produces about 15-25 cubic yards of chips per hour. An 18-inch drum chipper on a land-clearing job can produce 40-80 cubic yards per hour. But the actual throughput depends heavily on the feed rate (how fast the crew can feed material), the species and diameter mix (large logs chip faster per volume than small brush), and downtime for repositioning, refueling, and knife sharpening. This calculator applies realistic production factors based on industry data from TCIA (Tree Care Industry Association) benchmarks.

The output includes the estimated chip volume in cubic yards, the number of standard chip truck loads (typically 12-15 loose cubic yards for a single-axle, 20-25 for a tandem), the estimated processing time, and the fuel consumption of the chipper. This helps crew leaders plan truck logistics — having a truck ready when the current one fills avoids idle time for the chipper crew.

Pro Tip: Sharp chipper knives are the single biggest factor in maintaining rated throughput. Dull knives reduce throughput by 30-50%, increase fuel consumption, produce stringy chips that don't pack well in the truck, and put excessive strain on the feed system. Most commercial chippers need knife sharpening or rotation every 4-8 hours of active chipping. Schedule knife service based on operating hours, not calendar time.

Estimate the green weight of logs before chipping

Green Log Weight Estimator →

Calculate rigging shock loads for tree removal operations

Dynamic Rigging Shock Load Calculator →

Estimate fuel combustion emissions from chipper operations

Fuel Combustion Emissions Calculator →

How It Works

Select Chipper Type and Capacity

Choose drum chipper or disc chipper and enter the maximum diameter capacity in inches. Drum chippers typically offer higher throughput for large-diameter material, while disc chippers produce more uniform chip size and are more common in the 6-18 inch capacity range.
Enter Material Estimates

Estimate the total volume of brush and log material to be chipped. Enter the mix of material sizes: small brush (under 4 inches), medium limbs (4-8 inches), and large logs (over 8 inches). The size mix affects throughput because large-diameter material chips faster per cubic yard than small brush.
Set Production Factors

Enter the crew feed rate efficiency (how consistently material is being fed), expected downtime for repositioning and refueling, and the knife condition factor. Default values are provided based on TCIA industry averages.
Review Throughput and Truck Logistics

Check the estimated cubic yards per hour, time to fill each truck, total truck loads, total processing time, and fuel consumption. Use the truck fill time to schedule truck swaps so the chipper crew is never waiting for an empty truck.

Built For

Tree service crew leaders planning truck logistics for large removal jobs with multiple chip truck loads
Land clearing contractors estimating chipper production rates for bid preparation
Arborist company owners comparing the productivity of different chipper sizes for fleet purchasing decisions
Municipal tree departments planning annual brush collection programs and estimating chip volumes for composting or mulch distribution

Features & Capabilities

Drum and Disc Chipper Models

Includes production rate models for both drum and disc chippers from 6-inch through 21-inch capacity, based on industry data from chipper manufacturers and TCIA benchmarks. Each model accounts for the chipper's rated throughput and typical real-world efficiency.

Material Size Mix

Adjusts throughput based on the proportion of small brush versus large-diameter material being processed. Small brush (under 4 inches) reduces throughput because it is harder to feed consistently, while large logs at or near the chipper capacity produce the highest volume per hour.

Truck Load Calculator

Estimates the number of chip truck loads based on the total chip volume and selectable truck size: single-axle (12-15 CY), tandem-axle (20-25 CY), or trailer chip box (25-35 CY). Shows the time to fill each truck for logistics planning.

Fuel Consumption Estimate

Estimates the chipper fuel consumption in gallons per hour based on the chipper engine size and load factor. Typical fuel consumption ranges from 3-5 GPH for a 6-inch chipper to 10-18 GPH for a 21-inch whole-tree chipper.

Frequently Asked Questions

How many cubic yards of chips does a tree produce?

A rough rule of thumb is that a tree produces about 1 cubic yard of chips per 6-8 inches of trunk diameter (DBH) for a typical shade tree with a full crown. A 24-inch DBH oak might produce 3-4 cubic yards of chips from the brush and limbs (the trunk sections are usually too large to chip and go to the log pile). A 12-inch DBH tree typically produces 1.5-2 cubic yards. These are very rough estimates — actual volume varies enormously with crown density, species, and how much of the tree is chipped versus logged.

How long does it take to fill a chip truck?

With a 12-inch disc chipper running at a steady feed rate on limb wood, a 20-cubic-yard tandem chip truck typically fills in 45-75 minutes. With an 18-inch drum chipper on a land-clearing job, the same truck can fill in 20-30 minutes. The actual time depends on crew efficiency, material diameter, species hardness, and knife condition. The goal is to have the next truck arriving as the current one fills so the chipper never waits for an empty truck.

What affects chipper throughput the most?

In order of impact: (1) knife sharpness — dull knives reduce throughput by 30-50%; (2) material feed rate — gaps between pieces mean the chipper is running empty; (3) material diameter relative to chipper capacity — operating near maximum capacity slows the feed system; (4) species hardness — hard species like oak and hickory chip slower than soft species like pine and poplar; (5) chipper engine power — an underpowered chipper bogs down on large-diameter material and has to slow the feed.

Learn More

Arboriculture

Chipper Production & Chip Volume Estimation

How to estimate wood chip volume from tree removal operations using DBH, expansion factors, and truck capacity planning.

Read Guide →

Related Tools

Arboriculture Live

Green Log Weight Estimator

Estimate green wood weight by species, diameter, and length with crane/loader WLL capacity check.

Launch Tool →