Rectangular Prism Calculator

Calculate volume, surface area, diagonal, and face areas for a rectangular prism.

Last updated: June 2026 | By Patchworkr Team

Prism Dimensions

Length

Width

Height

Length is required.

Volume = l x w x h. Surface area = 2(lw + lh + wh). The space diagonal is the straight-line distance through the solid.

Live Results

Enter valid dimensions to see results.

Formulas

Volume: V = l x w x h

Surface area: SA = 2(lw + lh + wh)

Space diagonal: d = sqrt(l^2 + w^2 + h^2)

Example: l = 10, w = 6, h = 4

Volume: 10 x 6 x 4 = 240

Surface area: 2(60 + 40 + 24) = 248

Space diagonal: sqrt(10^2 + 6^2 + 4^2) = sqrt(152) about 12.32882801

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