How Much Fill Dirt Do I Need?
Free Calculator & Guide
Estimating fill dirt is one of the most common questions we get. Or skip it — call 510-393-0881 with your dimensions and we'll work it out with you.
The Basic Formula
Fill dirt is sold in cubic yards. One cubic yard = 3 ft × 3 ft × 3 ft = 27 cubic feet.
(Length ft × Width ft × Depth ft) ÷ 27 = Cubic yards
Fill Dirt Calculator
Enter a positive number for each dimension.
Delivery volume: Over 5 cubic yards. Estimates include a 10% allowance and round up to the next half yard.
Example Project Volumes
These are geometric volumes before the calculator’s 10% allowance and rounding. Examples below the delivery minimum are not available as small loads.
| Project | Dimensions | Yards |
|---|---|---|
| Small backyard low spot | 10×10 ft, 6 in deep | 1.85 yd (below 5-yd min; no small-load delivery) |
| Medium yard leveling | 20×20 ft, 1 ft deep | 14.8 yd |
| Large backyard regrade | 50×30 ft, 4 in deep | 18.5 yd |
| Paver patio base | 15×20 ft, 4 in deep | 3.7 yd (below 5-yd min; no small-load delivery) |
| Driveway slab base | 20×40 ft, 6 in deep | 14.8 yd |
| Filling a former pool | 15×30 ft, 5 ft avg | 83 yd (multiple loads) |
| ADU pad prep | 25×30 ft, 8 in deep | 18.5 yd |
Tips for Ordering the Right Amount
- Our calculator adds a 10% planning allowance. Actual compaction requirements depend on the material and project specifications.
- Confirm the estimated total and available load sizes before scheduling. Delivery requires more than 5 cubic yards.
- Measure depth at several points on uneven ground and use the average for each section.
- For variable-depth holes or pools, measure several sections and use their volumes rather than one deepest measurement.
- Account for slope — the low side needs more fill.
- Plan how material will move from the truck drop area to the project. Truck access and on-site spreading are separate considerations.