Free Circle Circumference Calculator
Calculate the circumference (perimeter) of a circle from its radius. Also shows the area and diameter.
Circumference
43.9823
Area153.9380
Diameter14.0000
How to Calculate the Circumference of a Circle
Formula
C = 2 × π × r
Or equivalently: C = π × d (where d is the diameter)
Where:
Example Calculation
Find the circumference of a circle with radius 7.
- 01C = 2 × π × 7
- 02= 14π
- 03= 14 × 3.14159
- 04≈ 43.9823
Frequently Asked Questions
Learn More
How to Calculate Percentages - Complete Guide
Learn how to calculate percentages step by step. Covers finding a percentage of a number, percentage change, reverse percentages, and real-world applications.