Use this circumference calculator to quickly calculate circumference of circle using its radius. Perfect for circle circumference formula tasks.
C = circumference of the circle
r = radius of the circle
π ≈ 3.14159
| Radius | Circumference |
|---|---|
| 1 | 6.283185 |
| 2 | 12.566371 |
| 3 | 18.849556 |
| 5 | 31.415927 |
| 10 | 62.831853 |
1. Measure the radius of the circle.
2. Multiply the radius by 2.
3. Multiply the result by π.
This circumference calculator automatically computes results with up to six decimal places. Useful for students, engineers, and designers who need precise calculate circumference of circle results.
• Circumference is the perimeter of a circle.
• Ancient civilizations approximated π for calculations.
• The formula is used in engineering and architecture.
• Wheels, gears, and circular tracks rely on accurate circumference.
• Learning circumference helps understand circle geometry fundamentals.