32 · Calculators

Volume Calculator

Choose a shape and enter its dimensions to get the volume, plus how many litres or gallons it holds.

Volume

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How to use the volume calculator

  1. Choose a shape.
  2. Choose the unit you measured in.
  3. Enter the dimensions shown for that shape.

Volume formulas

  • Box: length × width × height
  • Cylinder: π × radius² × height
  • Sphere: 4/3 × π × radius³
  • Cone: π × radius² × height ÷ 3
  • Square pyramid: base² × height ÷ 3

Capacity

One litre is 1,000 cm³, and one US gallon is about 3.785 litres. That makes it easy to size fish tanks, planters, water butts and moving boxes.

Examples

Box, 30 × 20 × 15 cm

9,000 cm³ · 9 litres

Cylinder, radius 5 cm, height 15 cm

1,178.0972 cm³ · 1.178 litres

Questions

Should I use radius or diameter?

Radius, which is half the diameter.

Does it account for wall thickness?

No. Measure the inside dimensions to get the capacity of a container.

Are gallons US or UK?

US gallons. One UK gallon is about 1.2 US gallons.