How this calculator works
Maximum heart rate (HRmax) is the fastest your heart can beat during maximal exertion, and it is the reference point used to set training zones and gauge cardiovascular intensity. Since directly testing HRmax requires a supervised maximal exercise test, most people rely on age-based prediction formulas instead.
The original 220-minus-age formula has been in use since the 1970s and remains the most widely recognized, but it was never derived from a single rigorous study and carries a reported standard deviation of roughly 12-15 beats per minute. Later research produced alternative formulas — Tanaka's from a large meta-analysis, Gulati's specifically from a female population, and Nes's from a large Norwegian fitness study — each with somewhat smaller reported error, though still substantial. This calculator shows all four so you can see how much they actually differ for your age.
Every formula here is a population average, not medical advice, and a person's true HRmax can differ from any of them by more than 10 bpm. Anyone starting a new exercise programme — especially with a heart condition or other cardiovascular risk factor — should check with a doctor before using an estimated HRmax to set training intensity.
The formulas
Classic (Haskell & Fox, 1970): HRmax = 220 − ageTanaka, Monahan & Seals (2001): HRmax = 208 − 0.7 × ageGulati et al. (2010, women): HRmax = 206 − 0.88 × ageNes et al. (2013, HUNT Fitness Study): HRmax = 211 − 0.64 × ageReported standard deviations: roughly 12-15 bpm for the classic formula, ~10 bpm for Tanaka, ~11.8 bpm for Gulati, and ~10.8 bpm for Nes. Any of these formulas can be off by more than 10 beats per minute for a given individual.
Worked example: age 40
- Classic: 220 − 40 = 180 bpm.
- Tanaka: 208 − 0.7×40 = 208 − 28 = 180 bpm.
- Gulati: 206 − 0.88×40 = 206 − 35.2 = 170.8 bpm.
- Nes: 211 − 0.64×40 = 211 − 25.6 = 185.4 bpm — a spread of nearly 15 bpm across the four formulas at the same age.
Frequently asked questions
Should I trust one max heart rate formula over the other three?
None is precise for a specific individual — they are all population averages with substantial reported error (commonly 10-15 bpm). Tanaka and Nes are generally considered modest refinements over the original 220-minus-age rule for general populations; Gulati was derived specifically from women and is often recommended for that group.
Why is there a separate formula for women?
Gulati et al. (2010) derived their formula from a large sample of women (the St. James Women Take Heart Project), since most earlier HRmax research was done predominantly on men and may not generalize as well to women.
Can I just measure my actual max heart rate?
A supervised, medically screened maximal exercise test gives your true HRmax and is more accurate than any formula, but it requires professional supervision and is not something to attempt alone, especially if you have any cardiovascular risk factors.
How do I use max heart rate for training zones?
Training zones are usually set as percentages of HRmax (or, more precisely, of heart rate reserve using a resting heart rate). See the heart rate zone calculator to turn any of these HRmax estimates into a training zone table.
Why do the classic 220-minus-age and Tanaka formulas give the same number in the worked example?
It's a mathematical coincidence at that specific age, not a general rule. Setting 220 − age equal to 208 − 0.7 × age shows the two formulas cross at exactly age 40. Below age 40, Tanaka predicts a slightly lower max heart rate than the classic formula; above 40, Tanaka predicts a higher one, and the gap grows with age. This calculator shows all four formulas together so you can see exactly how much they diverge at your own age.