Triangle Calculator
Solve any triangle from sides or angles — get area, perimeter and the missing side or angle.
- Runs in your browser
- No upload on server
- Free, forever
- Enter values
- See result
- Copy or share
Enter any 3 values (at least one side). Leave the rest blank.
Sides: 3.000, 4.000, 5.000 Angles: 36.87°, 53.13°, 90.00° Perimeter: 12.000 Area: 6.000
Uses law of sines & cosines.
How this works — and why it's private
- Fill in any three parts — at least one must be a side.
- The rest of the triangle solves automatically.
- Copy the full breakdown with one tap.
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