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Triangle Perimeter Calculator

Find the perimeter of a triangle with this Triangle Perimeter Calculator.

Side 1 Length:
Side 2 Length:
Side 3 Length:
Fill in side lengths of the triangle to find the perimeter.

How do you find the perimeter of a triangle?

To find the perimeter, use this triangle perimeter formula:
Perimeter = Length of Side 1 + Length of Side 2 + Length of Side 3

Example: The perimeter of a triangle with side lengths of 3 inches, 4
inches and 5 inches:

Triangle Perimeter = 3 + 4 + 5

Calculated out this gives a perimeter of 12 Inches.