Triangular Prism Surface Area Calculator

Calculate the total surface area and volume of a triangular prism from its three triangle sides and prism length.

Last updated: June 2026 | By Patchworkr Team

Triangle and Prism Inputs

Side A

Side B

Side C

Prism Length

Side A is required.

Surface area = perimeter x prism length + 2 x triangle area. Triangle area is computed with Heron's formula from the three sides.

Live Results

Enter valid triangle sides and prism length to see results.

Formulas

Triangle area: A = sqrt(s(s-a)(s-b)(s-c)), where s = (a+b+c)/2

Surface area: SA = perimeter x length + 2A

Volume: V = A x length

Example: triangle sides 3, 4, 5; prism length 10

Triangle area: 6

Perimeter: 12

Surface area: 12 x 10 + 2 x 6 = 132

Volume: 6 x 10 = 60

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