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Chord Length Calculator
Length of a chord from the circle radius and central angle, or from the distance to the centre.
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Chord
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Length of a chord from the circle radius and central angle, or from the distance to the centre.
Chord Length Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: c = 2 r sin(theta/2).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Chord Quick Guide
Typical values for reference.
| Radius | Angle | Radius | Chord |
|---|---|---|---|
| 10 | 30 | 10 | 5.1764 |
| 10 | 60 | 10 | 10.0000 |
| 10 | 90 | 10 | 14.1421 |
| 10 | 180 | 10 | 20.0000 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Chord Length Calculator FAQ
Answers to common questions about this calculator.
A straight line joining two points on a circle.
The diameter.
c = 2 r sin(theta/2).
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.