How to use this calculator
Five zones span 50–60%, 60–70%, 70–80%, 80–90%, and 90–100% of the selected scale. Choose an age-based estimate or enter a maximum already established for you. The tool does not measure maximum heart rate or tell you to perform a maximal-effort test.
- Enter calculate, maximum heart rate, adult age and review the remaining options.
- Select Calculate or change a value to update the result. Read the result label and units before copying.
- Use Reset to restore the worked starting values.
Formula and method
Population estimate only; medication, health conditions, and individual variation affect heart rate. Seek qualified guidance for training decisions.
Worked example
At age 30, estimated maximum heart rate is 187 bpm.
Questions about heart rate zones calculator
Are age-based maximum heart rates exact?
No. Select a disclosed age-based formula or enter a known maximum. Percentage and heart-rate reserve methods use that maximum; individual variation and medication affect interpretation. Custom intensity ranges and illustrative effort mappings are estimates, not personalized exercise clearance.
What assumptions should I check?
Population estimate only; medication, health conditions, and individual variation affect heart rate. Seek qualified guidance for training decisions.
Are my inputs saved?
Calculations run in your browser. We store only tool IDs for favorites and recent tools. Sharing inputs in links is disabled for this category.
Health tools provide general estimates, not diagnoses or personal medical advice. BMI offers a labeled CDC child/teen reference; adult screening bands must not be applied to children. Discuss health and exercise decisions with a qualified professional. Read the tool-specific sources below for background on the method.