What Is a Dozer Blade Capacity Calculator?
Blade capacity tells you how much material a dozer can push in front of its blade in a single heaped load. This calculator uses the SAE J1265 straight-blade capacity formula — the industry-standard method manufacturers use to publish blade ratings — based on blade width, blade height, and how steeply the material piles up (its angle of repose).
It also estimates the weight of that load using a material density you provide, which is useful for gauging traction and horsepower requirements on a push.
How to Read Your Results
Heaped Blade Capacity
The volume of material, in loose cubic yards (LCY), the blade can carry heaped above its top edge, using the SAE J1265 formula.
Capacity (Cubic Feet)
The same capacity before converting to cubic yards, useful for cross-checking against manufacturer spec sheets that sometimes list blade capacity in cubic feet.
Estimated Material Weight
The approximate weight of a full heaped blade load, calculated from the volume and the material density you entered — helpful for judging pushing effort and traction needs.
Angle of Repose Used
The material angle applied in the calculation, so you can quickly confirm it matches the material you're actually pushing.
Real-World Example
A straight dozer blade measuring 12 feet wide and 3.5 feet tall, pushing material with a 35-degree angle of repose and a density of 2,500 lb per cubic yard:
| Input | Value |
|---|---|
| Blade width × height | 12 ft × 3.5 ft |
| Angle of repose | 35° |
| Blade capacity | ≈3.89 cu yd |
| Estimated weight | ≈4.86 tons |
That capacity is in line with the roughly 3.8–4.6 LCY heaped capacity published for similarly sized mid-size dozer blades, confirming the formula lines up with real spec-sheet figures.
Tips for Estimating Blade Capacity
- Looser, drier material spreads out more (lower angle of repose) and reduces heaped capacity versus cohesive material.
- Taller blades gain capacity faster than wider ones since height is squared in the formula — a small height increase adds more volume than the same increase in width.
- Use manufacturer-rated blade dimensions for the most accurate comparison against published spec-sheet capacities.
- Weight estimates depend heavily on moisture content, so re-check density figures after rain or in wet ground conditions.
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Last updated: August 2026 · Reviewed by: Simple Calculator Tools Editorial Team