6XC

Perimeter Calculator

Calculate the perimeter of a square, rectangle, triangle or the circumference of a circle.

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Perimeter Formulas

Perimeter is the total boundary length: square 4a, rectangle 2(a+b), triangle a+b+c, and a circle's circumference 2πr. The result is in the same unit you enter — handy for fencing, skirting boards, picture frames and running tracks.

Frequently Asked Questions

How much fencing for a 20×30 m garden?

2 × (20 + 30) = 100 m, plus a few percent for gates and overlaps.

What is the circumference of a 5 m radius circle?

2 × π × 5 ≈ 31.42 m. From diameter instead: C = π × d.

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