Calculate the volume and weight of crushed stone needed for driveways, paths and drainage.
This crushed stone calculator works out how much crushed stone you need for a driveway, path, drainage trench or sub-base, in cubic yards, cubic metres and tonnes/tons. Crushed stone is angular rock from a quarry – sold in the US by grade numbers (e.g. #57, #411) and in the UK as MOT Type 1, scalpings or graded chippings.
| Grade (US / UK) | Typical use |
|---|---|
| #57 stone / 20 mm clean | Drainage, driveway top, concrete |
| #411 / MOT Type 1 | Compactable driveway sub-base |
| Crusher run / scalpings | General fill and base |
A driveway base 6 m × 3 m at 100 mm = 18 m² × 0.1 m = 1.8 m³. Crushed stone is about 1.6 t/m³ (1.35 US tons per cubic yard), so roughly 2.9 tonnes – about 3–4 bulk bags.
Crushed stone weighs about 1.6 tonnes per cubic metre, or roughly 1.35 tons per cubic yard, depending on the stone size.
Multiply length × width × depth to get the volume, then multiply by the density to get the weight. This calculator does both for you.
For driveways allow 100–150 mm (4–6 in). For a decorative top layer 50 mm (2 in) is usually enough over a compacted sub-base.
Crushed stone is mechanically crushed rock with angular, interlocking edges that compact firmly, while gravel is naturally rounded. Crushed stone is better for sub-bases and driveways; rounded gravel suits drainage and decorative use.
A 20 mm graded crushed stone or MOT Type 1 makes a good compacting sub-base; smaller decorative stone is better as a top dressing.
