Arc Length Calculator

Find the arc length of a circle from radius and angle.

Arc Length & Sector Area Calculator

Fill in the fields below to calculate

Radius (r)

Central Angle (θ)

Enter your values above to see the result.

Your Results

Arc Length

Sector Area

Chord Length

Segment Area

Angle

Formula

L = (θ/360) × 2πr

s = arc length
r = radius
θ = central angle (radians)
A = ½r²θ (sector area)
c = 2r×sin(θ/2) (chord)

Related Calculators

Pro Tips

Sector is the "pizza slice" — sector area minus the triangle area gives the circular segment.

A full circle arc = circumference (2πr), achieved when θ = 2π radians (360°).