Arc Length & Sector Area Calculator
Math ToolsArc length, sector area and chord from radius and angle
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History
All history →Arc Length & Sector Area Calculator — at a glance
Measure part of a circle from the radius and angle.
Radius 10
Angle 60°
Calculate
Arc length
Sector area
How to use it — step by step
The radius and the central angle.
1
Enter your values
Fill in the fields. Default numbers are shown so you can see how it works.
2
Press Calculate
The answer appears at once as large result cards.
3
Copy or share
Copy the result, or share a link that opens with your numbers filled in.
Pro tips
Small things that make the result better.
✦A full circle is 360° or 2π radians.
✦Arc length = radius × angle in radians.
✦Use the same unit for radius and results.
Quick facts
Freeno signup
Privateruns in your browser
Instantresult in a second
No limituse it as often as you like
Frequently Asked Questions
What is a sector?+
A pie-slice shaped part of a circle between two radii.
What is a segment?+
The area between a chord and its arc.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.
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