Which formula should I use?

Tanaka's 208 − 0.7×age formula is generally considered more accurate across a wider age range, based on a 2001 meta-analysis of over 18,000 subjects that found 220-minus-age systematically overestimates max HR in older adults and underestimates it slightly in younger ones. It's the default here for that reason.

Why do gym heart-rate charts still use 220-minus-age?

It's older (Fox et al., 1971), simpler to compute in your head, and became the default embedded in decades of gym equipment and fitness charts before Tanaka's research was published — inertia, not accuracy, is why it's still common.

How accurate is any age-based formula?

Both are population averages with a real individual error margin — commonly cited at roughly ±10–12 beats per minute for any one person. A supervised lab or field max-HR test gives a more personally accurate number than either formula.

Max Heart Rate Calculator

Estimate your maximum heart rate with a toggle between the Tanaka (2001) formula and the traditional 220-minus-age formula, shown side by side.

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Formula: Tanaka: 208 − 0.7 × age; Fox (220-minus-age): 220 − age

Worked examples

25-year-old, Tanaka formula
At younger ages the two formulas stay fairly close together — a 4 bpm gap here.
60-year-old, Tanaka formula
By age 60 the formulas diverge by 6 bpm, illustrating why Tanaka's research flagged 220-minus-age as increasingly inaccurate with age.
45-year-old, Fox (220-minus-age) formula
Selecting the traditional 220-minus-age formula, still the version many gym charts and older fitness trackers default to.

What this calculator does

Estimated maximum heart rate is the reference point most heart-rate training zones — including the Karvonen-method zone calculator elsewhere in this hub — use to set training intensity targets. This tool calculates it from your age using a toggle between two published formulas, shown side by side so you can see how much they diverge for your specific age.

The two formulas

The traditional formula, from Fox, Naughton & Haskell (1971), is simply 220 minus your age — easy to compute in your head, and for decades the default embedded in gym charts, older fitness trackers and training books. The Tanaka formula, from Tanaka, Monahan & Seals' 2001 meta-analysis of over 18,000 subjects, is 208 minus 0.7 times your age. Tanaka's research specifically set out to test whether 220-minus-age held up across a large combined dataset, and found it systematically overestimates true max heart rate in older adults while slightly underestimating it in younger people — which is why Tanaka is the default formula in this tool.

Why the formulas diverge with age

At age 20, the two formulas differ by less than a beat per minute. By age 60, they diverge by roughly 6 bpm, and the gap keeps widening with age — a direct consequence of the different coefficients each formula applies to age (a full 1.0 bpm per year for Fox versus 0.7 bpm per year for Tanaka). This growing gap is exactly what Tanaka's research identified as a systematic bias in the older formula for older populations.

How accurate is either formula?

Both are population averages fit to different reference datasets, and neither predicts any single individual's true max heart rate precisely — a commonly cited individual error margin for age-based formulas is roughly ±10 to 12 beats per minute. Genetics, training history and even measurement conditions all cause real max heart rate to vary meaningfully from either formula's prediction. A supervised lab or field max-heart-rate test (pushing to true exhaustion under professional guidance) gives a more personally accurate number than any age-based formula.

What to do with the result

Whichever formula you use, the resulting number feeds directly into heart-rate training zone calculations — a higher or lower estimated max HR shifts every training zone's bpm boundaries proportionally. If you already know your actual measured max heart rate from a supervised test, use that number directly in the heart-rate zone calculator instead of either formula here.

Not medical advice

This tool gives a general fitness estimate from published research formulas. It is not a substitute for a supervised cardiovascular fitness assessment, and anyone with a heart condition or new to vigorous exercise should consult a qualified healthcare provider before training near estimated maximum heart rate.

Frequently asked questions

Which formula should I use?: Tanaka's 208 − 0.7×age formula is generally considered more accurate across a wider age range, based on a 2001 meta-analysis of over 18,000 subjects that found 220-minus-age systematically overestimates max HR in older adults and underestimates it slightly in younger ones. It's the default here for that reason.
Why do gym heart-rate charts still use 220-minus-age?: It's older (Fox et al., 1971), simpler to compute in your head, and became the default embedded in decades of gym equipment and fitness charts before Tanaka's research was published — inertia, not accuracy, is why it's still common.
How accurate is any age-based formula?: Both are population averages with a real individual error margin — commonly cited at roughly ±10–12 beats per minute for any one person. A supervised lab or field max-HR test gives a more personally accurate number than either formula.
What is max heart rate used for?: It's the reference point most heart-rate training zone calculators (including the Karvonen-method zone calculator elsewhere in this hub) use to set intensity targets — a higher or lower estimated max HR shifts every training zone's bpm range.

These calculators give general estimates from published formulas. They are not medical advice and do not account for your individual health; talk to a qualified professional before changing your diet or training.