Heart Rate Zones Calculator

Formula

Percentages of maximum heart rate

Worked example

Max HR 200 — Zone 2 starts at 120 bpm

Quick answer

What does the Heart Rate Zones Calculator do?

Estimate five training zones from a supplied maximum heart rate.

What is the Heart Rate Zones Calculator?

Estimate five training zones from a supplied maximum heart rate. Use it when you have the required inputs and want a deterministic, repeatable result with the calculation method visible.

How to use this calculator

Enter the values requested by the tool, keep units and time periods consistent, resolve any validation message, calculate, then review the primary answer together with the displayed formula and supporting values.

Formula and method

This calculator uses the deterministic formula Percentages of maximum heart rate. Enter the required values, then review the displayed substitution and result breakdown to verify the calculation.

Worked example

Max HR 200 Zone 2 starts at 120 bpm

Common mistakes to avoid

Check units, decimal points, percentages, signs, date/time order, selector choices, and rounding. For important decisions, verify the result against an independent source or qualified professional when appropriate.