Arc Length Calculator
Calculate the length of a curved arc from a circle's radius and angle.
Calculate
Enter your values below.
Result
Arc length
0
Formula used
Arc length = 2πr × (angle ÷ 360)
Example: Radius 10, angle 90° → arc length ≈ 15.71.
How to use this calculator
- Enter Radius, Angle (degrees).
- Press Calculate to see your result instantly.
FAQ
Frequently asked questions
What is arc length?
The distance measured along the curved part of a circle between two points.
What if the angle is 360°?
The arc length equals the full circumference.
Can I use radians?
This calculator expects degrees — convert radians by multiplying by 180/π first.
How does radius affect arc length?
Arc length scales directly with radius for the same angle.