You need to measure it with something flexible, like a string.
If you know for sure it is a circle, it would be easier to measure the diameter, then multiply by pi.
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Given the diameter of the circle, multiply it by π (approx 3.14159).
The circumference of a circle measures the distance around the circle.
There is no such specific unit of measure as a circumference - a circumference is merely the distance around something.
Circumference is a linear measure and has no volume - just as a straight line has no volume.
The circumference is the distance around a circle and it is measured by:- Circumference of a circle = 2*pi*radius or pi*diameter