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Instant result
Enter the data and press the button to do the calculation.
Online Calculator
Rectangular prism calculator
Enter length, width, and height to calculate a rectangular prism’s main properties.
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Local processing
The values are processed directly in your browser.
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Free
No registration, external API or subscription required.
Frequently asked questions
How is the volume calculated?
Volume = length × width × height.
How is the surface area calculated?
Area = 2(length×width + length×height + width×height).
What is the spatial diagonal?
It's the distance between two opposite vertices of the prism.
Can I choose units?
Yes. You can work in millimeters, centimeters, or meters.