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Heart Rate calculator

Heart Rate Zone
Calculator

Calculate personalized training zones with heart-rate reserve. Enter age, resting heart rate, and intensity for personalized heart-rate guidance.

Start Heart Zones Explore Heart Rate
100% privateInstant resultsNo sign-up
1Enter your details

Calculate your result

Use realistic, recent measurements for the most useful estimate.

100% privateInputs stay in this browserInstant resultsCalculated in real timeNo sign-upFree to use
2Your result
Heart ZonesREADYStart with the form

Your result will appear here

Complete the form and select “Calculate result.” Your measurements never leave this page.

Educational estimate only—not medical advice.
Understand your result

How your Heart Zones estimate is created

A transparent overview of the inputs, method, and appropriate interpretation.

Evidence-informed Browser based
How it works

About this Heart Zones estimate

It estimates maximum heart rate, subtracts resting heart rate to find reserve, then applies the chosen intensity to create a personalized training target.

Karvonen heart-rate-reserve method
Age + resting HR→Heart-rate reserve=Estimated Heart Zones
  1. 01Enter details
  2. 02Review inputs
  3. 03Use the estimate
Private by designNo account requiredInputs are not stored
Common questions

Heart Rate Zone Calculator FAQ

Clear answers to help you understand and use your estimate.

01Is the Heart Rate Zone Calculator free and private?

Yes. It is free, runs in your browser, requires no account, and does not store the measurements you enter.

02Can I use this result as medical advice?

No. This result is an educational estimate, not a diagnosis or treatment recommendation. A qualified professional can interpret it within your complete health and training context.

03Why might my Heart Zones result differ from a real-world result?

Medication, heat, hydration, stress, sleep, illness, and the age-based maximum-heart-rate equation can shift an appropriate training zone.

04How often should I recalculate Heart Zones?

Recalculate when age, resting heart rate, or selected intensity changes. If medication or health status changes, ask a qualified clinician whether formula-based targets are appropriate.

Read our calculation methodology →Still have questions? Explore the guides ↗