The Gravel Calculator estimates volume from footprint and depth, then estimates weight using bulk density. Results separate base volume, extra material and the total with allowance. Cubic metres, cubic yards, metric tonnes and US short tons are shown; an optional unit price adds a material cost estimate.
Use it for an initial material estimate for paths, landscaping beds and other uniform-depth gravel layers. It does not choose a suitable depth, design drainage or determine structural load capacity. Select the depth required for your project and confirm density and material condition with the supplier.
| Input | Meaning |
|---|---|
| Shape | Rectangle takes length and width; Circle takes diameter; Known area takes your measured total |
| Units | Metric uses metres, m², centimetres and kg/m³; US customary uses feet, ft², inches and lb/ft³ |
| Depth | Uniform layer thickness greater than zero; use centimetres or inches as labeled |
| Bulk density | Mass per volume of the piled material, including voids between particles; match its state to the volume being estimated |
| Extra material | 0–100%; enter 0 for no allowance rather than leaving it blank |
| Material price | Optional, non-negative price per metric tonne, US short ton, m³ or yd³ |
| Currency | USD, CNY, EUR, GBP, JPY or RUB; labels the entered price and output without conversion |
The starting density of 1600 kg/m³ is an editable example, not a specification for every gravel. Use a decimal point or comma without grouping separators. For example, 1,600 means 1.6 here: enter sixteen hundred as 1600. Scientific notation and text containing unit suffixes are not accepted.
Changing the unit system converts valid dimensions, depth and density while retaining the price and its explicitly selected basis. Editing a field clears the previous result until you calculate again. Reset restores metric units, 5 cm depth, 1600 kg/m³ example density, zero allowance, empty dimensions and price, a per-tonne price basis and USD. Inputs are not saved in the URL or browser storage.
Convert measurements to metres: centimetres ÷ 100, feet × 0.3048 and inches × 0.0254.
It depends on bulk density. At the editable example density of 1600 kg/m³, one cubic metre weighs 1.6 metric tonnes. Use supplier data for your material's grading, moisture and packing state.
No. A metric tonne is 1000 kg. A US short ton is 2000 lb, or 907.18474 kg. Both are labeled separately in the results and pricing options.
No. A 10% allowance multiplies the base volume by 1.10 without changing density. Compaction needs a density and specification matched to the material's actual state.
No. It is the allowance-adjusted quantity multiplied by the price you enter. Delivery, tax, labor and equipment are excluded. Currency is a label, not an exchange-rate conversion.
Divide it into measurable shapes, add their areas and use Known area. Calculate separate sections individually when their depths or material densities differ.
砂利の体積、重量、材料費を見積もります。