Heart Rate Calculator

CARDIO FITNESS HEALTH
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By Checked against sources by , Founder & Architect, RECATOOLS Published Updated Last reviewed

Find your max heart rate + 5 training zones (recovery, aerobic, threshold, VO₂max). Tanaka & Karvonen formulas.

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Heart Rate Calculator

⚠ Disclaimer: FOR FITNESS AND EDUCATIONAL PURPOSES ONLY. NOT MEDICAL ADVICE. These calculations are based on population-average formulas and may not reflect your individual physiology. Consult a physician before beginning any exercise programme, especially if you have cardiovascular conditions, pregnancy, or other medical concerns. Heart rate, body composition, and metabolic estimates from this tool are not substitutes for direct medical measurement.
For information only. Calculated zones are estimates based on population formulas. They are not a substitute for medical advice or a clinical exercise test. Consult a doctor before starting a new exercise programme, especially if you have cardiovascular risk factors.

Measure first thing in the morning, sitting still, count for 60 seconds.

Estimated max heart rate
— bpm
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How to use the heart rate calculator

Enter your age

Age is the main input. In Tanaka's 2001 equation, maximum heart rate falls by 0.7 bpm for each year of age. Ages from 10 to 100 are accepted.

Add your resting HR (optional)

If you know your resting heart rate — measured first thing in the morning, sitting still for 60 seconds — enter it. The tool will use the Karvonen heart-rate reserve method for more personalised zones.

Pick a formula (or trust auto)

"Auto" uses Tanaka 2001 for men and Gulati 2010 for women. Tanaka found that 220 minus age underestimates older adults, and Gulati found that it overestimates women. Pick a specific formula if your training plan is written around one.

Read the 5 zones

Zone 1 (recovery) to Zone 5 (VO₂max), each with a bpm range and a short description. The five-zone ladder is a coaching convention, so treat the boundaries as a starting point and adjust them to how the effort feels.

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Heart rate training zones — what the science actually says

Heart-rate zones divide exercise intensity into bands so you can train easy days easy and hard days hard. Every zone is a share of your maximum heart rate, or of your heart-rate reserve if you give a resting rate, so the estimate of your maximum is what everything rests on. The equations this tool offers are population averages, and individuals differ from them a good deal: the largest direct study, Nes 2013, reports a standard error of 10.8 bpm.

Why 220 minus age is being replaced

"220 minus age" appeared in a 1971 review by Fox, Naughton and Haskell, not in a study designed to measure maximum heart rate. The researchers who replaced it wrote that it "was not derived from original research". Tanaka and colleagues (Tanaka et al., 2001) pooled averages from 351 studies and 18,712 people, fitted 208 − 0.7 × age, and confirmed it in 514 people tested in a laboratory. They found that 220 minus age underestimates maximum heart rate in older adults, and that the line was the same for men and women and was not changed by habitual activity. Gulati and colleagues (Gulati et al., 2010) studied 5,437 women and found 206 − 0.88 × age, concluding that the traditional calculation overestimates the maximum for women. Nes and colleagues (Nes et al., 2013) tested 3,320 healthy adults with verified maximal efforts and found 211 − 0.64 × age.

Karvonen or straight percentage

Karvonen's method sets zones as a share of heart-rate reserve, maximum minus resting. Take two 30-year-olds with a maximum of about 190: a runner resting at 45 has a reserve of 145, a desk worker resting at 75 a reserve of 115. At 65% of reserve, the runner's target is 139 bpm and the desk worker's 150 bpm. Straight percentage of maximum would give them both the same number. This tool uses reserve-based zones when you enter a resting rate and falls back to percentage of maximum when you do not; the two methods give quite different zones, so the page says which one it used.

Resting heart rate

Your resting rate is worth measuring for its own sake. Take it in the morning before you get up, over a full minute, and average several days, because single readings are noisy. It tends to fall as aerobic fitness improves. A reading well above your usual one can be a sign of poor sleep, illness or incomplete recovery, and is a reason to take an easy day.

Where each maximum-heart-rate equation came from

01

"220 minus age" traces to a 1971 review by Fox, Naughton and Haskell, not a study designed to measure maximum heart rate.

02

Tanaka 2001 pooled 18,712 people from 351 studies and fitted 208 − 0.7 × age.

03

Tanaka confirmed the equation in 514 people tested in a laboratory, who gave a near-identical line, 209 − 0.7 × age.

04

Tanaka found the line did not differ between men and women and was not changed by habitual physical activity.

05

Gulati 2010 studied 5,437 women and found 206 − 0.88 × age, lower than the traditional formula for women.

06

In Gulati's cohort, each extra beat of peak heart rate went with a 3% lower risk of death after adjustment.

07

Nes 2013 tested 3,320 healthy adults in Norway and found 211 − 0.64 × age, with a standard error of 10.8 bpm.

08

Nes found earlier equations underestimated maximum heart rate above age 30.

09

In Tanaka's equation, maximum heart rate falls by 0.7 bpm a year; in Gulati's, by 0.88 bpm a year.

10

Karvonen zones are a share of maximum minus resting, so your resting rate moves every zone.

Frequently asked questions

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They are only as good as the maximum they start from. Nes 2013 reports a standard error of 10.8 bpm for its equation, so an individual can easily be 10 bpm or more away from the prediction, and every zone boundary moves with it. For general training that is acceptable. If you need precise zones, a supervised maximal test gives your own figure.
Tanaka. It was fitted to far more data, and Tanaka found that 220 minus age underestimates maximum heart rate in older adults. The two equations agree at age 40 and move apart from there. Fox is offered because many training plans still quote it.
It uses your own resting rate. Two people of the same age have the same predicted maximum, but a fit person with a low resting rate has a wider working range. Karvonen zones take that into account; straight percentage of maximum does not. The cost is one extra number to measure.
In the morning, before you get up, count your pulse at the wrist or neck for a full 60 seconds, or read it from a tracker you wore overnight. Do this on several mornings and use the average, because single readings vary.
Yes. These are population averages, and individuals differ from them. If you have a heart condition or high blood pressure, take medication that affects heart rate, or are starting exercise after a long break, check with a doctor before training by heart rate.
You can, but expect your heart rate at a given effort to differ between sports, so zones from a running-based maximum may feel different in the pool or on the bike. Many cyclists train by power rather than heart rate for that reason.
A device figure is often the highest heart rate it has recorded during your workouts. If you have done genuinely all-out efforts with a reliable sensor, that observed figure may be closer to your true maximum than any equation. If you have not, the equation is the better guide. Wrist sensors can also misread during hard efforts.
The zones are the same; the way you use them differs. Steady sessions stay in one zone for a long time. Intervals push briefly into the top zones with recovery between, and because heart rate takes time to rise, a short interval may end before your heart rate reaches the zone at all.
Caffeine can change how your heart rate responds to exercise, and the effect varies from person to person. If you train after coffee or a pre-workout drink, compare your heart rate against sessions without it before treating a high reading as a sign of fatigue.
Both push your heart rate up at a given pace. In the heat your body sends more blood to the skin to cool you, so the same run in a Singapore or Kuala Lumpur afternoon will read higher than in air-conditioning. Slow down to stay in the zone you planned, and allow time to acclimatise.

Method & sources

What this tool implements

  • The equation label called Nes 2013 'active adults'. The HUNT cohort was 3,320 healthy adults and the paper reports no interaction with physical activity or VO2max; Tanaka likewise found activity did not change the line. The label now carries a cohort note only for Gulati's women-only fit.
  • Removed as unsourced: an 'APAC fitness culture' section with HR-monitor adoption percentages, a 'Polar Club' deployment at the Singapore Sports Hub with '~50,000 users', a 26 bpm resting-rate record, Tabata heart-rate, Heart Foundation Walking and Borg RPE claims, and numeric caffeine, heat and altitude shifts.
  • Karvonen worked example checked: max ~190, resting 45 vs 75, 65% of reserve = 139 vs 150 bpm.

Sources

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