Triangle Perimeter Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the three sides.
- Press Calculate.
How it works
Perimeter = the sum of the three sides.
Worked example
3, 4, 5 m. = 12 m.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.