How Much Limestone for a 20×40 Driveway?
A 20 × 40 ft driveway (800 ft²) at 4″ deep needs 15.8 tons of crushed limestone — 9.88 yd³ net plus 10% waste. Order 16.00 t — quarries sell by the ton; a tri-axle carries about 20 tons per load.
20×40 at other depths
| Depth | Volume | Order (tons) | 50 lb bag (0.5 ft³) |
|---|---|---|---|
| 2″ | 4.94 yd³ | 7.9 tons | 294 |
| 4″ (this page) | 9.88 yd³ | 15.8 tons | 587 |
| 6″ | 14.81 yd³ | 23.6 tons | 880 |
Other driveway sizes
Order 16.00 t — quarries sell by the ton; a tri-axle carries about 20 tons per load.
- Area
- 800 ft²
- Volume (266.7 ft³)
- 9.88 yd³
- Net weight @ 1.45 t/yd³
- 28,642 lb · 14.32 t
- Waste / settling 10%
- + 1.43 t
- Order quantity
- 15.75 tons
- Truckloads
- 1 × tri-axle dump (≈20 t)
- Metric
- 7.55 m³ · 14.29 tonnes
- 50 lb bag (0.5 ft³)
- 587 bags
- Materials + delivery$25–$55 / ton · Sep 2026
- $485 – $965
- Installed (with labor)typ. $1,087
- $721 – $1,595
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Different size or depth?
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How to calculate crushed limestone by hand
Tons = Length (ft) × Width (ft) × Depth (in) ÷ 12 ÷ 27 × 1.45 t/yd³
Worked example
- Area: 50 ft × 12 ft = 600 ft².
- Volume: 600 ft² × (4 in ÷ 12) = 200 ft³ = 7.41 yd³.
- Weight: 7.41 yd³ × 1.45 t/yd³ = 10.7 tons.
- Compaction and waste 10%: 10.7 × 1.10 = 11.8 tons → order 12 tons, one tri-axle load.
- 1 ton #57 limestone at 4″
- ≈ 56 ft²
- 1 ton #57 limestone at 2″
- ≈ 112 ft²
- 1 yd³ crushed limestone
- ≈ 2,900 lb · 1.45 t
- Tri-axle dump
- ≈ 20 tons
Questions crews ask
How much limestone do I need for a driveway?
Square feet × depth in inches ÷ 324 gives cubic yards; × 1.45 gives tons. A 12 × 50 ft driveway at 4″ of #57 is 7.4 yd³ ≈ 10.7 tons; order 12 with compaction. For a new driveway lay 4–6″ of ¾″ minus first, then 2″ of #57.
How much does a ton of limestone cover?
About 56 ft² at 4″ deep, 75 ft² at 3″ and 112 ft² at 2″ for #57. Limestone is a little denser than granite gravel, so a ton covers slightly less than the 1.4 t/yd³ figures used for generic gravel.
What is #57 limestone used for?
#57 is ¾″ washed stone with no fines: driveway top course, drainage around pipes and foundations, under slabs and in French drains. It stays loose and drains. For a base that locks together use ¾″ minus or screenings.