Introducing the Heart Rate Zones Calculator — Train Smarter

Training by feel often means going too hard on easy days and not hard enough on hard ones. The new Heart Rate Zones calculator turns your age — and optionally your resting heart rate — into five target ranges you can train by.

What it does

• Max heart rate: Tanaka, Fox, or a custom measured value.
• Karvonen method: add a resting heart rate to personalise the zones.
• Five zones: from recovery to maximum effort, as bpm ranges.
• Clear intensities: each zone shows its percentage band and purpose.
• Client-side: nothing is uploaded.

Why it matters

Zones turn vague effort into a number you can target, so easy sessions stay easy and intervals hit the right intensity. That makes a training plan measurable instead of guesswork.

A note on safety

These are estimates for general fitness, not medical advice. If you have a heart condition or take medication that affects heart rate, talk to a doctor first.

Learn more

Want the reasoning behind the zones? Our heart rate zones guide explains max HR, the Karvonen method, and how to train by each zone — then try the Heart Rate Zones calculator.