Geometry & Measurement Calculators
Arc Length Calculator
Find the length of a circular arc from its radius and central angle.
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What is Arc Length?
An arc is a portion of a circle's circumference. Its length is the same fraction of 2πr as the central angle is of 360°.
How it works
We scale the circumference by θ/360 for the arc length, and derive the sector area and chord for the same slice.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Realistic sample
Type or paste any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
Nothing is uploaded — every tool in this category runs entirely in your browser.