A familiar situation
Estimate how much water a cylindrical planter or storage container can hold.
How to use this calculator
- Enter solid, length / radius / side, width / height and the remaining inputs.
- Select Calculate to see the answer and its breakdown.
- Keep a scenario, change an input and compare the results.
Use consistent units and check the assumptions below before applying the result.
How volume is calculated
The selected solid uses its standard geometric volume rule: for example cylinder πr²h, sphere 4πr³/3, cone πr²h/3, or prism base area multiplied by length. A cylinder with radius 3 cm and height 8 cm has volume π × 3² × 8 ≈ 226.19 cm³.
Cube a³; box lwh; cylinder πr²h; sphere 4πr³/3; cone πr²h/3; triangular prism (bh/2)L.A cylinder with radius 3 cm and height 8 cm has volume π × 3² × 8 ≈ 226.19 cm³.
Assumptions & useful context
The result depends on the values you enter and the method described above. Displayed numbers may be rounded; calculations use the unrounded values. Check that this model matches your situation before relying on it.
Frequently asked questions
Should radius or diameter be entered?
Enter radius for circular shapes; if you know diameter, divide it by two first.
What assumptions apply to a triangular prism?
Its base is a triangle with the two supplied perpendicular legs.