How Much #57 Stone for 400 Square Feet?
How much #57 stone for 400 square feet depends on depth. At 4 inches you need about 4.94 cubic yards, roughly 6.7 tons at 1.35 tons per yard. Going to 6 inches raises it to 10.0 tons.
Volume and tonnage calculator →#57 stone for 400 sq ft by depth
| Depth | Cubic yards | Tons | Tons +10% |
|---|---|---|---|
| 2 in | 2.47 | 3.3 | 3.7 |
| 3 in | 3.70 | 5.0 | 5.5 |
| 4 in | 4.94 | 6.7 | 7.3 |
| 6 in | 7.41 | 10.0 | 11.0 |
Working it out
- 400 sq ft × (4 ÷ 12) ft = 133.3 cubic feet.
- ÷ 27 = 4.94 cubic yards.
- × 1.35 tons per yard = 6.7 tons.
About #57 stone
#57 stone is a clean crushed stone in roughly the 1/2 to 1 inch range with very few fines. It drains fast, which suits drainage layers and the top of a gravel drive, but it does not pack into a hard crust by itself. Expect the weight to fall in the range of 1.3 to 1.45 tons per yard.
Ordering checklist
- Measure odd shapes in pieces. Split curves and L-shapes into rectangles and add them.
- Add a margin. About 10 percent covers compaction and low spots.
- Bulk or bags. Bulk delivery is the practical choice here.
- Prep first. Remove sod, compact the subgrade and set edging before the stone arrives.
Use the volume and tonnage calculator for any other size.
Good and poor uses for #57 stone
Best suited to:
- French drains and drainage layers
- The top course of a gravel driveway
- Under sheds where water needs to drain away
Less suited to:
- A standalone base, since it does not pack hard without fines
- Paver setting beds
- Walk paths meant for strollers or wheelchairs
Quick reference numbers
- Per inch over 100 sq ft: about 0.42 tons of #57 stone (0.31 cubic yards).
- Per inch over 1,000 sq ft: about 4.2 tons.
- Another size for comparison: a 12x24 area at 4 inches takes about 4.8 tons.
- Weight used here: about 1.35 tons per cubic yard.
Common estimating mistakes
- Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
- Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.
- Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
- Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
Questions people ask
How many tons of #57 stone for 400 square feet?
About 6.7 tons at 4 inches deep.
How many cubic yards of #57 stone for 400 square feet?
About 4.94 yards at 4 inches.
How much #57 stone for 400 square feet at 2 inches?
About 3.3 tons, or 2.47 cubic yards.
How much does a yard of #57 stone weigh?
About 1.3 to 1.45 tons.
Should I add extra?
Yes, about 10 percent is a common allowance.
Related guides
- Number 57 Stone: Size, Weight, Uses, and Coverage
- Tons to Cubic Yards for Gravel: Conversion Chart
- How Much Does a Ton of Gravel Cover? Depth Chart
- How Much #57 Stone for 250 Square Feet?
- How Much #57 Stone for 300 Square Feet?
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