Math Calculators

Arc Length Calculator

Calculate the length of a circular arc from its radius and central angle, in the unit of your choice.

Arc length —

About the Arc Length Calculator

Arc length is the distance along the curved edge of a circle between two points, determined by the radius and the central angle in radians. The radius and the arc length result each have their own unit selector, so you can mix units freely — the calculator converts everything automatically.

Formula: Arc Length = r × θ (θ in radians) = r × (angle in degrees × π ÷ 180)