Gravel Calculator
Work out how many tonnes and cubic metres of gravel or crushed stone you need for a driveway or path, plus the cost — from the area and depth. Free, instant, no sign-up.
Area & depth
Price
Your gravel estimate
Area15,0 m²
Volume0,75 m³
Gravel needed1,13 t
≈ bulk bags (1 t)2 bags
Estimated gravel costR 394
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Create a free account →How the gravel calculation works
volume (m³) = length × width × (depth_mm ÷ 1000) gravel (tonnes) = volume × 1.5 (t/m³) bulk bags = ⌈tonnes⌉ (1-tonne bags) gravel cost = tonnes × price per tonne
FAQ
- How do I calculate how much gravel I need?
- Multiply the area by the depth to get the volume in cubic metres, then multiply by the gravel density (about 1.5 tonnes per m³) to get the weight. This calculator does it and estimates the cost.
- How many tonnes of gravel are in a cubic metre?
- Crushed stone and gravel weigh roughly 1.5 tonnes per cubic metre, so 1 m³ ≈ 1.5 t. Wet or fine material weighs a little more.
- How deep should a gravel driveway be?
- A gravel top layer is usually 40–60 mm over a compacted sub-base. Deeper for heavy vehicles or soft ground.
- Does this include the sub-base?
- This estimates the gravel layer you enter. Create a free BuilderBuddi account to build the full driveway estimate with sub-base, edging, and labour.
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