How Much Gravel for 100 Square Feet?
How much gravel for 100 square feet depends on depth. At 4 inches you need about 1.23 cubic yards, roughly 1.7 tons at 1.4 tons per yard. Going to 6 inches raises it to 2.6 tons.
Volume and tonnage calculator →Gravel for 100 sq ft by depth
| Depth | Cubic yards | Tons | Tons +10% |
|---|---|---|---|
| 2 in | 0.62 | 0.9 | 1.0 |
| 3 in | 0.93 | 1.3 | 1.4 |
| 4 in | 1.23 | 1.7 | 1.9 |
| 6 in | 1.85 | 2.6 | 2.9 |
Working it out
- 100 sq ft × (4 ÷ 12) ft = 33.3 cubic feet.
- ÷ 27 = 1.23 cubic yards.
- × 1.4 tons per yard = 1.7 tons.
About gravel
Because ’gravel’ covers so many products, the weight per yard moves with stone size and how much fine material is in the pile. Rounded stone with no fines rolls under tires; crushed stone with fines locks together. Expect the weight to fall in the range of 1.3 to 1.5 tons per yard.
Getting the order right
- 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.
When to choose gravel
Best suited to:
- Rural driveways and lanes where low upfront cost matters
- Drainage areas and around downspouts
- Temporary access while a site is under construction
Poor fit for:
- Steep slopes, where loose stone washes downhill
- Spots plowed often, since plows push gravel into the lawn
- Areas next to doors, because stone tracks inside
Quick reference numbers
- Per inch over 100 sq ft: about 0.43 tons of gravel (0.31 cubic yards).
- Per inch over 1,000 sq ft: about 4.3 tons.
- Another size for comparison: a 14x28 area at 4 inches takes about 6.8 tons.
- Weight used here: about 1.4 tons per cubic yard.
Where estimates go wrong
- Assuming every supplier uses the same weight. Two yards selling the same product name can quote different tons per yard.
- Measuring only the main rectangle. Aprons, turnouts and curved edges add real square footage.
- Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
- Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.
Questions people ask
How many tons of gravel for 100 square feet?
About 1.7 tons at 4 inches deep.
How many cubic yards of gravel for 100 square feet?
About 1.23 yards at 4 inches.
How much gravel for 100 square feet at 2 inches?
About 0.9 tons, or 0.62 cubic yards.
How much does a yard of gravel weigh?
About 1.3 to 1.5 tons.
Should I add extra?
Yes, about 10 percent is a common allowance.
Related guides
- How Much Does a Ton of Gravel Cover? Depth Chart
- Tons to Cubic Yards for Gravel: Conversion Chart
- How Much Does a Ton of Gravel Cover? Depth Chart
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