Target Heart Rate Zones

Target Heart Rate Zones. Fat burn, cardio, and peak zones. Fast, accurate, private.

Age

Resting HR (bpm)

Estimated max HR

190 bpm

Karvonen zones from 220 − age.

Zone 1 (recovery)125–138 bpm

Zone 2 (fat burn)138–151 bpm

Zone 3 (aerobic)151–164 bpm

Zone 4 (threshold)164–177 bpm

Zone 5 (max)177–190 bpm

Steps

Calculate target heart rate training zones — warm-up, fat burn, cardio, and peak by age.

Are results official?

No — quick estimates only. Confirm with your bank or provider.

Is data saved?

No. Calculations run in your browser.

Where is the full tool?

Each satellite links back to the main hub calculator.