Volume Calculator
Calculate the volume of 3D shapes including cubes, cylinders, spheres, cones, and more. Includes unit conversions for gallons and liters.
A volume calculator computes the volume of common 3D shapes such as cubes, cylinders, spheres, and cones, with built-in unit conversions for gallons and liters.
Examples
Swimming Pool Volume
Frequently Asked Questions
What is the formula for the volume of a cylinder?
Quick Tips
- •Convert units to the same system before entering values.
- •Double-check your inputs — small errors in dimensions are amplified in volume calculations (cubic scaling).
- •Use the unit conversion output to quickly compare volumes in gallons, liters, or cubic units.
A volume calculator computes the volume of common 3D shapes such as cubes, cylinders, spheres, and cones, with built-in unit conversions for gallons and liters.
How to Use This Calculator
Select the 3D shape (e.g. cube, rectangular prism, cylinder, sphere, cone) from the dropdown. Choose your units for input and output. Enter the required dimensions (e.g. side length, radius, height) as prompted. Click Calculate to see the volume, the formula used, and conversions to other units such as gallons or liters.
Understanding the Formula
Cube: side³. Rectangular Prism: l × w × h. Cylinder: πr²h. Sphere: (4/3)πr³.
Examples
Swimming Pool Volume
A 20ft × 10ft × 5ft rectangular pool has a volume of 1,000 ft³, which is approximately 7,480 gallons.
Frequently Asked Questions
What is the formula for the volume of a cylinder?
The volume of a cylinder is V = πr²h, where r is the radius of the base and h is the height.
Assumptions & Limitations
- Assumes exact input dimensions — rounding errors in measurements will propagate to the result.
- All shapes are treated as ideal geometric solids; real-world irregularities are not accounted for.
- Unit conversions use standard definitions (e.g., 1 US gallon = 231 cubic inches).