Prism Volume Calculator
Volume and surface area for rectangular and triangular prisms.
Enter your values
ⓘ Live results
Results
- Volume
- 120 cubic units
- Cross-section area
- 12 sq units
- If units are feet
- 4.4444 cubic yards
- If units are inches
- 0.519 US gallons
- If units are cm
- 0.12 litres
- Prism length
- 10
Quick answer
Every prism's volume is the cross-section area multiplied by its length: V = A × L, no matter the shape of the end face.
V = cross-section area × length
How to use the Prism Volume Calculator
- 1Choose the shape of the end face.
- 2Enter its dimensions, then the length of the prism.
- 3Read the volume plus the handy unit conversions underneath.
Worked example
Using the values the calculator loads with:
Inputs
- Cross-sectionRectangle
- Width / base4 units
- Height of the cross-section3 units
- Second parallel side (trapezoid only)6 units
- Prism length10 units
Results
- Volume120 cubic units
- Cross-section area12 sq units
- If units are feet4.4444 cubic yards
- If units are inches0.519 US gallons
- If units are cm0.12 litres
- Prism length10
Frequently asked questions
Does the prism have to be upright?
No. As long as the cross-section is constant along the length, the formula holds however it leans.
What about a cylinder?
A cylinder is a prism with a circular cross-section — use πr² as the area.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.