Maximum Heart Rate: Why 220 Minus Age Is Only a Rough Guide
220 minus your age gives an estimate of the average maximum heart rate for people your age, not a measurement of yours. Real maximum heart rates vary widely between individuals of the same age, so the formula can be out by a margin of 10 to 20 beats per minute in either direction. That is enough to make heart rate zones built on it too easy for some people and too hard for others. Use it as a starting point, then refine with how the effort feels, a talk test, or your own observed heart rate in hard sessions. Your maximum heart rate is not a measure of fitness, and a higher or lower number is not better or worse.
Here is why the formula is so rough, what the alternatives are, and how to set training intensity in a way that actually fits you.
Where 220 minus age came from
The formula is usually traced to work published in the early 1970s that pulled together data from earlier studies and drew a simple line through it. It was never intended as a precise individual prediction. It caught on because it is easy to remember and easy to put into exercise equipment, and it has been printed on gym posters and built into fitness watches ever since.
Later research produced alternatives. The best known is the Tanaka formula, published in 2001: 208 minus 0.7 times your age. It gives slightly higher estimates for older adults than 220 minus age does. It is also an average, and has the same basic limitation.
How the formulas compare
| Age | 220 minus age | 208 minus 0.7 x age |
|---|---|---|
| 30 | 190 | 187 |
| 40 | 180 | 180 |
| 50 | 170 | 173 |
| 60 | 160 | 166 |
| 70 | 150 | 159 |
The difference between the formulas is small in middle age. The difference between the formula and a real person can be far bigger.
Why your number can be well off
Individual variation is large
Two healthy 45-year-olds can have maximum heart rates 20 or more beats apart. Neither is fitter because of it. Maximum heart rate is largely set by your genetics and declines gradually with age; training does not raise it in any meaningful way.
Some medicines change heart rate
Certain medicines, including some prescribed for blood pressure and heart conditions, lower heart rate during exercise. If you take regular medication, ask your GP or pharmacist whether it affects your heart rate before you rely on heart rate targets. Do not change any medication to suit training.
Context changes the reading
Heat, dehydration, poor sleep, stress, caffeine and illness all push heart rate up at a given effort. The type of exercise matters too. Many people see a lower peak on a bike than when running, because less muscle mass is working.
Why it matters for heart rate zones
Most watches and apps set your training zones as percentages of maximum heart rate. If the formula overestimates your maximum, every zone is set too high, and your “easy” sessions are actually moderately hard. If it underestimates, your hard sessions are not hard. Our guide to zone 2 cardio explains why getting the easy zone right matters so much.
Better ways to judge intensity
The talk test
The NHS describes moderate activity as raising your heart rate and breathing so you can still talk but not sing, and vigorous activity as being unable to say more than a few words without pausing for breath. It is simple and surprisingly reliable. See the NHS physical activity guidelines.
Rate of perceived exertion
Rate the effort from 1 to 10. Easy aerobic work sits around 3 to 4, steady work around 5 to 6, hard intervals 8 to 9. With a little practice, this tracks your real effort better than a formula.
Your own observed peak
The highest heart rate you see near the end of genuinely hard efforts, such as the last of several hard intervals, gives a more personal figure than any formula. It may still be a little below your true maximum. That is fine for setting zones.
A sensible way to set your zones
- Start with a formula to get a rough number.
- Over two to three weeks, note the highest heart rate you see in your hardest sessions.
- Check your easy sessions with the talk test. If you cannot talk comfortably, slow down regardless of what the watch says.
- Adjust your zones on your watch using your observed peak.
- Recheck occasionally, particularly if your training changes a lot.
Do not try to hit your maximum on purpose to “test” it unless you are healthy, already training hard, and comfortable doing so. A formal maximal test is best done with supervision.
Safety first
If you have a heart condition, high blood pressure, take medication that affects heart rate, are pregnant, or are returning to exercise after a long break, check with your GP first before using heart rate targets or doing hard sessions. Stop exercising and get medical help if you have chest pain, unusual breathlessness, dizziness or palpitations.
How we use heart rate in the studio
Heart rate is one tool among several. On the air bike, a mix of heart rate, how the effort feels and how quickly you recover between rounds gives a better picture than any single number. Our post on resting heart rate and fitness covers the more useful number to watch over time. In 1-1 personal training in Highgate, conditioning targets are set from how you respond, not from your date of birth.
Questions we get asked
Is 220 minus age accurate?
It is accurate as an average for a group, not for an individual. Your true figure may be noticeably higher or lower.
Does a higher max heart rate mean I am fitter?
No. Maximum heart rate is mostly genetic and falls gradually with age. Fitness shows more in how hard you can work and how quickly you recover.
Is it dangerous to go over my calculated max?
Seeing a number above the formula’s estimate is common, because the formula may simply underestimate you. If you feel unwell, though, stop.
Which formula should I use?
Either is a reasonable start. Then refine with your own data and how the effort feels.
See how conditioning fits a full training plan on the personal training page, or start at The Highgate House homepage.
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