Use the formula: Circumference = π × Diameter
Multiply the diameter by 3.14159
Example: if the diameter is 10, the circumference is 31.4159
If needed, use C = πd
Use the formula: Circumference = π × Diameter
Multiply the diameter by 3.14159
Example: if the diameter is 10, the circumference is 31.4159
If needed, use C = πd