Heart Rate Calculator
Calculate maximum heart rate and the five training zones for fat burn, endurance and VO2 max work.
Inputs
Formula
- MHR = 220 − age
- Zone = ((MHR − resting) × %) + resting (Karvonen)
The Karvonen method uses your heart-rate reserve, so it adapts to fitness: a fitter heart with a low resting rate gets higher zone numbers. Zone 2 builds the aerobic base, zone 4 raises threshold pace.
Step-by-step calculation
- 1
Max HR
220 − age
190 bpm
- 2
Reserve
MHR − resting
125 bpm
Frequently asked questions
What does the Heart Rate Calculator do?
Calculate maximum heart rate and the five training zones for fat burn, endurance and VO2 max work. The Heart Rate Calculator on OneCalcApp returns the result instantly as you type, together with the formula and the substituted values.
How do I use the Heart Rate Calculator?
Enter your values in the input fields, choose the relevant units or options, and the Heart Rate Calculator recalculates automatically. You can copy, print or export the result.
Is the Heart Rate Calculator free to use?
Yes. The Heart Rate Calculator is completely free, needs no sign-up and has no usage limit on OneCalcApp.
How accurate is the Heart Rate Calculator?
It uses the standard formula MHR = 220 − age and full double-precision arithmetic, so results match a manual calculation to the displayed number of digits.
Does the Heart Rate Calculator work on mobile and offline?
Yes. The Heart Rate Calculator runs entirely in your browser on phones, tablets and desktops, and your inputs never leave your device.
Where can I find related tools?
OneCalcApp hosts 300+ calculators and converters, including the full Health collection. Related tools are linked at the bottom of every page.
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