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 measure volume — length, width, and depth Length Width Depth
Measure length, width, and depth (thickness).

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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