Gravel Calculator

Find out how much gravel you need for a driveway, path, or drainage layer — in tons, cubic yards, and bags — plus an estimate of the cost.

How to calculate gravel

Start with the volume, then convert to weight since gravel is usually sold by the ton:

Cubic yards = area (sq ft) × depth (ft) ÷ 27, then tons = cubic yards × 1.4

Depth is normally measured in inches, so divide it by 12 first. The 1.4 figure is the typical weight of crushed gravel per cubic yard; it varies a little by stone type and moisture, so confirm with your supplier.

Recommended depths

UseRecommended depth
Topping up an existing path1–2 in
New garden path2–3 in
Driveway surface layer3–4 in
Driveway / patio base4–6 in (compacted)

Tips

  • Order by the ton for big jobs. Bulk delivery is far cheaper than bags once you need more than about a cubic yard.
  • Use landscape fabric. It stops gravel sinking into the soil and suppresses weeds.
  • Compact in layers. Deep driveways should be laid and tamped in stages.

Frequently asked questions

How much gravel for a 200 sq ft path?
At 2 inches deep that's about 1.23 cubic yards, or roughly 1.7 tons of typical crushed gravel.
How many tons in a cubic yard?
About 1.4 tons for typical gravel, ranging from roughly 1.3 to 1.5 depending on the stone and moisture.
How deep should the gravel be?
2 inches for paths, 4 inches or more for driveways — usually over a deeper compacted base.
Should I buy by ton or by bag?
Bulk by the ton is cheaper for large areas; bags suit small top-ups. The calculator shows both.

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