Multiply square feet by depth in feet to get cubic feet, divide by 27, then multiply by density: 500 sq ft at 3 inches deep needs 4.63 cubic yards, which is about 6.9 tons of crushed stone.
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Order – tons (includes your waste allowance) so compaction and spillage don’t leave you short.
Square Feet to Tons Calculator Guide
Most projects don’t start as a volume — they start as a footprint. A patio drawn on graph paper, a driveway measured off a satellite photo, a “roughly 600 square feet” from a landscaper’s walkthrough. Area-first estimating takes that footprint straight to an order weight in two moves: multiply the square feet by the depth in feet to get cubic feet, then divide by 27 and multiply by density. 500 sq ft at 3 inches is 500 × 0.25 = 125 ft³ = 4.63 yd³, which at crushed stone’s 1.5 tons per yard comes to about 6.9 tons.
Because area is fixed early and depth is a design decision, the most useful mental unit is tons per 100 square feet. Learn that ladder once and you can price-check any bid at the kitchen table — every extra inch of depth costs about 0.46 tons per 100 square feet in crushed stone.
How Many Tons per 100 Square Feet?
| Depth | Crushed stone (1.5 t/yd³) | Gravel (1.4 t/yd³) | Typical application |
|---|---|---|---|
| 1 in | 0.46 tons | 0.43 tons | Refresh over existing stone |
| 2 in | 0.93 tons | 0.86 tons | Decorative beds, walkway top course |
| 3 in | 1.39 tons | 1.30 tons | Paths, patio base layer |
| 4 in | 1.85 tons | 1.73 tons | Driveway base, shed pads |
| 6 in | 2.78 tons | 2.59 tons | Heavy vehicles, French drains |
Scaling is linear in both directions: a 250 sq ft patio base at 3 inches needs 1.39 × 2.5 = 3.5 tons; a 1,200 sq ft driveway at 4 inches needs 1.85 × 12 = 22.2 tons — which, at 13–15 tons per tandem truck, is a two-delivery order. The table is also a bid-reading tool: if a contractor quotes 30 tons for that driveway, they’re either planning 5–6 inches of depth or padding the material line.
Getting the Area Number Right
- Depth is where area estimates die. The footprint is easy to measure; the layer thickness is a choice, and choosing 2 inches when the job needs 4 halves the order. Decide the application first, then read the depth off the table.
- Satellite measurements run generous. Online map tools trace to the visual edge, including overhangs and shadow; knock 5% off a satellite-measured footprint or, better, spot-check it with a tape.
- Square yards sneak into quotes. Paving trades sometimes price per square yard — 9 square feet. A “200 square yard” driveway is 1,800 square feet, not a small job.
- Add waste after converting. A 10% allowance on the tonnage covers compaction and edge feathering; put it on at the end so it doesn’t compound with rounded-up dimensions.
When you’d rather think in coverage than weight — “how far will this stone spread” — the stone coverage calculator answers the inverse question. And once a supplier responds with a tonnage quote, sanity-check the volume behind it with the tons to cubic yards calculator.
Frequently Asked Questions
How many tons do I need for 1,000 square feet?
At 2 inches deep, about 9.3 tons of crushed stone; at 3 inches, 13.9 tons; at 4 inches, 18.5 tons. Depth is the multiplier people forget — the area alone can’t give a tonnage.
How do I measure square footage for an irregular area?
Break the space into rectangles and triangles, calculate each, and add them up. For gentle curves, average the widest and narrowest widths and multiply by the length — landscape estimating doesn’t need survey precision, it needs honest averages.
Does the material change the tons per square foot?
Yes, in proportion to density. The same 500 sq ft at 3 inches needs 6.9 tons of crushed stone (1.5 t/yd³) but only 6.2 tons of pea gravel (1.35 t/yd³). Pick your actual material in the calculator.
Square feet or square yards — which do suppliers use?
Landscape plans usually speak square feet, but bulk pricing is per ton or per cubic yard. One square yard is 9 square feet; this calculator accepts both so you can enter whichever your plan shows.