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Circle Center Calculator
Centre and radius of a circle through three points, or from the general equation.
ruler Free Online Tool
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Centre
Compare Your Options And Get Clear Answers
Centre and radius of a circle through three points, or from the general equation.
Circle Center Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Solve the perpendicular bisectors of two chords.
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
Circle Quick Guide
Typical values for reference.
| P1 | P2 | P3 | Centre |
|---|---|---|---|
| 2,8 | 7,3 | 2,-2 | (2, 3) r 5 |
| 0,0 | 4,0 | 0,3 | (2, 1.5) r 2.5 |
| 1,0 | 0,1 | -1,0 | (0, 0) r 1 |
| 2,2 | 6,2 | 4,6 | (4, 3.5) r 2.5 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Circle Center Calculator FAQ
Answers to common questions about this calculator.
Intersect the perpendicular bisectors of two chords.
No circle exists.
Solve the perpendicular bisectors of two chords.
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.