Volume Calculator

Multiply the dimensions using the shape's formula: a box is length × width × height, a cylinder is π × radius² × height, and a sphere is 4⁄3 × π × radius³. Keep all measurements in the same unit — the answer is in that unit cubed.

1 litre = 1,000 cm³, so divide cm³ by 1,000. A 10 × 10 × 10 cm box holds exactly 1 litre. 1 m³ = 1,000 litres.

One cubic foot holds about 7.48 US gallons (28.32 litres). One US gallon is 231 cubic inches, or 3.785 litres; a UK (imperial) gallon is 4.546 litres.

Measure the inside radius (half the diameter) and height, then V = π r² h. A tank 1 m across and 1.5 m tall holds π × 0.5² × 1.5 ≈ 1.178 m³, or 1,178 litres.

Volume is the space inside a shape (units³, like litres); surface area is the total area of its outside (units², like paint coverage).

Split it into simple shapes and add their volumes, or submerge it in water and measure how much the water level rises (1 ml of water displaced = 1 cm³).