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Clinical & CardioGenerated accuracy model review: 2026-05-06
Target Heart Rate accuracy and testing
This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.
Formula source
- Max HR = 220 - Age
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- Age: 30 years
Expected outputs
- Max Heart Rate: 190 bpm
- Moderate (60-70%): 114 - 133 bpm
- Vigorous (80-90%): 152 - 171 bpm
Known limitations
- The '220 - Age' formula is a general estimate. Actual max heart rate varies significantly by individual. Consult a doctor before starting an exercise program.
Assumptions
- The result uses the 220-minus-age rule, which is a population estimate rather than a personalized physiologic test.
- Training zones are approximate and can differ with medications, conditioning, and measured max heart rate.
- This tool supports exercise planning but does not determine whether exercise is safe for a given person.
Unit handling
- Age accepts values in years.
- Max Heart Rate is displayed in bpm.
Rounding rules
- Number displays use up to 2 decimal places in the calculator UI.
Version history
1.0.0 - 2026-05-06
Generated accuracy and testing page from the current target-heart-rate-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Target Heart Rate.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.