Rectangular Prism Calculator
Calculate the volume, surface area, and diagonal of a rectangular prism (box) given its length, width, and height.
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isCalculator Editorial Team
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How to use this tool?
How to Use the Rectangular Prism Calculator
This calculator computes the volume, surface area, and space diagonal of a rectangular prism (box).
- Enter dimensions: Input positive numbers for Length, Width, and Height in any consistent unit (e.g., cm, inches).
- Click "Calculate": Press the blue button to compute results.
- Read results: The output shows:
- Volume in cubic units (l × w × h)
- Surface Area in square units (2(lw + lh + wh))
- Space Diagonal in linear units (√(l² + w² + h²))
- Fix errors: If a field turns red, enter a positive number (e.g., 5, 2.5).
Tip: Use any unit system (metric or imperial) as long as all three inputs share the same unit.
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Frequently Asked Questions
A rectangular prism is a 3D shape with six rectangular faces, also known as a box or cuboid.
Volume = length × width × height.
Surface Area = 2(lw + lh + wh).
