Stone calculator
Stone Fill Calculator
Filling a low spot, a washout or a crawl space? Enter the footprint and the average fill depth for tonnage and truckloads.
Your project
Use the average depth across the whole area, not the deepest point.
Crews typically order 5-10% extra to cover compaction, spillage and uneven subgrade.
Delivered stone fill typically runs $18-$40 per ton.
Stone fill needed
13.86
US tons · includes 5% waste
- Area
- 480 sq ft
- Volume
- 9.33 cubic yards
- Volume (cubic feet)
- 252 cu ft
- Total weight
- 27,720 lb
- Density used
- 110 lb per cu ft (1.49 tons/yd³)
- Truckloads (15-ton)
- 1
- Estimated delivered cost
- $402
Quarry densities vary by source and moisture. Confirm tons per cubic yard with your supplier before placing a bulk order — a 10% density difference is a whole extra load on a big job.
The shareable link reopens this calculator with your exact inputs.
What stone fill is
Fill stone is whatever cheap, angular, well-graded rock the quarry sells for bulk void filling — usually crusher run, #3 rock, or recycled crushed concrete. It is bought on price per ton and placed to volume, not to a finish spec.
At 110 lb per cubic foot, one cubic yard weighs about 1.49 US tons, and one ton spread 2" deep covers roughly 109 square feet.
How to install it
Fill in lifts and compact each one. A 3 foot deep hole filled in one pour will settle for years; the same hole filled in six 6 inch compacted lifts is done settling the day you finish.
The mistake that costs the most
Measuring only the deepest point. Voids are bowl-shaped, so the average depth is typically half to two-thirds of the maximum. Overestimating here is the most common cause of a leftover pile nobody wants.
The math behind the calculator
Square feet × (depth in inches ÷ 12) = cubic feet. Cubic feet ÷ 27 = cubic yards. Cubic feet × 110 ÷ 2,000 = US tons. The waste allowance is applied to the volume before the weight conversion, which is how suppliers quote it.
Stone fill needed per 100 square feet
At 110 lb per cubic foot, before waste.
| Depth | Cubic feet | Cubic yards | Tons |
|---|---|---|---|
| 1" | 8.3 | 0.31 | 0.46 |
| 2" | 16.7 | 0.62 | 0.92 |
| 3" | 25 | 0.93 | 1.38 |
| 4" | 33.3 | 1.23 | 1.83 |
| 6" | 50 | 1.85 | 2.75 |
| 12" | 100 | 3.7 | 5.5 |
Recommended depth by application
| Application | Depth |
|---|---|
| Driveway washout repair | 4-8" average |
| Low spot regrading | 3-6" average |
| Crawl space vapour layer | 4" |
| Trench backfill | full trench depth |
Frequently asked questions
+How many tons of stone fill do I need?
Multiply square feet by depth in feet to get cubic feet, then multiply by 110 and divide by 2,000. A 500 sq ft area at 6" needs about 13.75 tons before waste.
+How many tons of stone fill are in a cubic yard?
Roughly 1.49 tons at 110 lb per cubic foot. Wet material weighs 5-10% more, which matters when you are buying by the ton and measuring by the yard.
+How deep should stone fill be?
Driveway washout repair: 4-8" average. Low spot regrading: 3-6" average. Crawl space vapour layer: 4". Trench backfill: full trench depth.
+What does stone fill cost?
$18 – $40 per ton delivered in most US markets, before the haul fee. Short loads carry a minimum charge, so half a load often costs nearly as much as a full one.