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Heart Rate Zone Calculator

Calculate the five heart rate training zones based on your age-predicted maximum.

About this calculator

The Heart Rate Zone Calculator on NumberCals is a free, mobile-friendly tool for anyone needing to calculate the five heart rate training zones based on your age-predicted maximum. Enter your values in the form below and the result is computed instantly — no sign-up, no installation, no waiting.

Formula used

Max HR ≈ 220 − age; Zones = % of Max

What you'll need

  • Age (e.g. 30)

What you'll get

  • Max Heart Rate (bpm)
  • Training Zones
Formula
Max HR ≈ 220 − age; Zones = % of Max

Frequently Asked Questions

Is 220 − age accurate? +

It's a population average. Individual max HR can vary by ±10–20 bpm — a treadmill test or chest-strap monitor will give a more personal number.

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