Calculate polygon perimeter or circle circumference from the entered measurements.
Last updated: June 2026 | By Patchworkr Team
Perimeter is the total distance around a shape.
1. Choose polygon or circle.
2. Enter the side lengths or radius.
3. Read the live perimeter or circumference result.
For side lengths 4, 6, 4, 6:
perimeter = 4 + 6 + 4 + 6 = 20
No. Spaces or commas both work.
The tool rejects it because a polygon needs at least three sides.
Yes, as long as the radius is a positive real number.
Yes. For circles, the perimeter is called circumference.
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