How to calculate a trailer load
Utility and dump trailers carry larger loads than pickups, and the weight rating decides what you can haul.
- Measure the inside length and width of the trailer, and the side height.
- Read the volume in cubic yards.
- Pick your material to see the weight.
- Compare with the trailer and tow vehicle ratings.
Worked example
For a typical trailer load with length 12 ft, width 6 ft, depth 2 ft, the volume is 144.00 cubic feet. Divide by 27 for 5.33 cubic yards. With a 10 percent allowance, plan for 5.87 cubic yards.
Trailer Load sizes and quantities
These common sizes are calculated with the same formula as the tool above, so you can find your number quickly.
| Size | Cubic feet | Cubic yards | With 10 percent extra |
|---|---|---|---|
| 8 by 5 ft, 1.5 ft high | 60.00 | 2.22 | 2.44 |
| 12 by 6 ft, 2 ft high | 144.00 | 5.33 | 5.87 |
| 14 by 7 ft, 3 ft high | 294.00 | 10.89 | 11.98 |
| 16 by 7 ft, 4 ft high | 448.00 | 16.59 | 18.25 |
Tips
- Spread heavy loads over the axle, with some weight on the tongue.
- Dump trailers have a low weight rating compared with their volume.
- Check the tires and brakes before a heavy haul.
Common mistakes to avoid
- Ignoring the gross vehicle weight rating.
- Loading everything behind the axle.
- Hauling wet material and forgetting its extra weight.
Frequently asked questions
How many cubic yards do I need for a trailer load?
Multiply the dimensions in feet and divide by 27. The example above, length 12 ft, width 6 ft, depth 2 ft, needs 5.33 cubic yards before waste.
How much extra should I order?
Add 5 to 10 percent for waste. Add more if the ground is uneven or the material is loose.
Can I enter inches and feet together?
Yes. Each box has its own unit selector, so you can mix feet and inches.
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