Karvonen Heart Rate 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 your age, resting heart rate and intensity.
- Press Calculate.
How it works
Target heart rate = ((220 − age) − resting) × intensity% + resting. It uses your heart-rate reserve for more personalised zones.
Worked example
Age 40, resting 60, 70%. = 144 bpm.
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.