Max Heart Rate Calculator
Max Heart Rate calculator. Tanaka, Fox, Gulati (women) and Nes (HUNT) equations side by side + Karvonen training zones. The cornerstone of zone-based cardio prescription.
Max Heart Rate Calculator
All 4 equations
Karvonen training zones (assuming RHR 65)
| Zone 2 — Aerobic base | — |
| Zone 3 — Tempo | — |
| Zone 4 — Threshold | — |
| Zone 5 — VO2 max | — |
How to use the max heart rate calculator
Enter age, sex, fitness level
Age in years. Sex affects which equation is recommended (Gulati 2010 is female-specific). Fitness level: choosing "athlete" switches the recommendation to Nes 2013, a large study that verified each person's maximal effort. Neither Nes nor Tanaka found that activity level changes maximum heart rate, so this is a choice of study, not a correction for fitness.
Compare across equations
Different equations give different numbers — typically a 5-15 bpm spread. Tanaka 2001: pooled 18,712 people from 351 studies, then checked in 514 in a laboratory. Fox 1971: the classic "220 minus age"; it crosses Tanaka at 40 and reads lower above that. Gulati 2010: 5,437 women. Nes 2013: 3,320 healthy men and women, standard error 10.8 bpm.
Read the Karvonen training zones
Karvonen Heart Rate Reserve (HRR) method: zones expressed as % of (Max HR − Resting HR). More accurate than %Max HR alone because it accounts for individual aerobic baseline. The calculator assumes RHR = 65 if you leave the resting-HR box blank; enter your actual morning RHR for personalised zones, and the heading will say which figure it used.
Use zones for cardio prescription
Zone 2 (60-70%): aerobic base, fat oxidation, "all-day" pace. Zone 3 (70-80%): tempo, marathon race pace for trained athletes. Zone 4 (80-90%): threshold / 10K pace. Zone 5 (90-100%): VO2 max intervals, short repeats. In studies of elite endurance athletes, about 80% of training sessions are low intensity and about 20% high intensity (Seiler 2010).
Test your real max HR if accuracy matters
Equations are estimates. Nes 2013 reports a standard error of 10.8 bpm, so many people sit 10 bpm or more from any prediction. If precise zones matter, a supervised maximal test gives your own figure. For general fitness, an equation is a reasonable start.
Max heart rate — the foundation of zone-based cardio training
Maximum heart rate is the highest rate your heart reaches in an all-out effort. Training zones are set as a share of it, so a better estimate gives better zones. This calculator shows four published equations side by side and recommends one based on your sex and training status.
The four equations
Fox 1971, "220 minus age", is the one on gym posters. It came from a review article rather than a study designed to measure maximum heart rate, and the researchers who replaced it wrote that it "was not derived from original research". Tanaka 2001 (Tanaka et al., JACC 2001) pooled group averages from 351 studies covering 18,712 people and fitted 208 − 0.7 × age, then confirmed it in 514 people tested in a laboratory. It found the line was the same for men and women and was not changed by habitual activity, and that 220 minus age underestimates maximum heart rate in older adults. Gulati 2010 (Gulati et al., Circulation 2010) studied 5,437 women who had a maximal stress test and found 206 − 0.88 × age, concluding that the traditional calculation "overestimates the maximum HR for age in women". Nes 2013 (Nes et al., 2013) measured 3,320 healthy adults in Norway's HUNT study, keeping only tests where a maximal effort was verified, and found 211 − 0.64 × age with a standard error of 10.8 bpm.
How much the choice matters
Fox and Tanaka cross at age 40 and move apart from there. At 50, Fox gives 170 bpm and Tanaka 173; at this tool's assumed resting rate of 65, their Karvonen Zone 2 bands (60-70% of heart-rate reserve) are 128-139 and 130-141 bpm, about 2 bpm apart. At 70 the Zone 2 ceiling differs by about 6 bpm. So the choice matters little in midlife and more with age. Beside that, the spread between people is large: Nes's standard error of 10.8 bpm is wider than the gap between most of the equations.
"HRmax is predicted, to a large extent, by age alone and is independent of gender and habitual physical activity status." Tanaka et al., JACC 2001
Why the studies disagree about women
Tanaka and Nes found no meaningful difference between men and women, while Gulati found a steeper decline for women. The studies were built differently: Tanaka pooled averages, Nes tested a general population, and Gulati studied women referred for a clinical stress test. This tool uses Gulati for women by default and shows the other equations beside it. If you are a woman and choose "athlete", it uses Nes and tells you the Gulati figure too, so you can compare.
The Karvonen method
Karvonen zones use heart-rate reserve, maximum minus resting. For a 40-year-old with a Tanaka maximum of 180 and a resting rate of 60, the reserve is 120, so Zone 2 at 60-70% of reserve is 132 to 144 bpm. The same zone as a straight percentage of maximum would be 108 to 126 bpm. Entering your own morning resting rate moves every zone, which is why the tool asks for it. On how training is spread across zones, Seiler's 2010 review (Seiler, 2010) found that elite endurance athletes training 10 to 13 times a week do about 80% of sessions at low intensity and about 20% with high-intensity work.
Four equations, what their cohorts were, and the Karvonen method
Fox 1971, 220 minus age, came from a review article, not a study designed to measure maximum heart rate.
Tanaka 2001 pooled 18,712 people from 351 studies and fitted 208 − 0.7 × age, confirmed in 514 people in a laboratory.
Tanaka found the line did not differ by sex or habitual activity, and that 220 minus age underestimates older adults.
Gulati 2010 studied 5,437 women and found 206 − 0.88 × age; the traditional formula overestimated their maximum.
Nes 2013 tested 3,320 healthy adults with verified maximal efforts and found 211 − 0.64 × age.
Nes reports a standard error of 10.8 bpm, so an individual can easily sit 10 bpm or more from any equation.
Nes found no effect of activity level or VO2max on maximum heart rate, and that earlier equations underestimated it above age 30.
Fox and Tanaka cross at age 40; above that Fox gives the lower figure.
Karvonen zones use heart-rate reserve, maximum minus resting, so your resting rate moves every zone.
Seiler found elite endurance athletes do about 80% of sessions at low intensity and about 20% at high intensity.
Frequently asked questions
Tanaka 2001 is a sound default for men and for anyone unsure, because it is based on the largest pool of data. Gulati 2010 is derived from women specifically and reads lower. Nes 2013 comes from a large study that verified each maximal effort; this tool uses it if you choose "athlete", though neither Nes nor Tanaka found that fitness changes maximum heart rate. Fox, 220 minus age, is shown for comparison because so many plans quote it. The gap between equations is usually smaller than the spread between individuals.
They are population averages. Nes 2013 reports a standard error of 10.8 bpm for its equation, which means many people sit 10 bpm or more above or below any prediction. For general training that is acceptable. If you need precise zones, a maximal exercise test, supervised where appropriate, gives you your own number.
A maximal test is hard exercise, so check with a doctor first if you have a heart condition, high blood pressure, or have been inactive. The usual approach is a thorough warm-up followed by a few minutes of progressively harder running or cycling, finishing all-out, while wearing a chest-strap monitor. The highest reliable reading is your tested maximum. Many sports clinics offer supervised tests.
Yes. A prediction is an average, and with a standard error of 10.8 bpm in Nes 2013, plenty of healthy people reach well above it. A reading far above both your prediction and your previous peaks is more often a monitor error, so check the device before trusting it.
Low-intensity training makes up most of what successful endurance athletes do. Seiler's 2010 review found that elite athletes training 10 to 13 times a week do about 80% of their sessions at low intensity, defined by blood lactate rather than heart rate, and about 20% with high-intensity intervals. Zone 2 on this calculator is 60-70% of heart-rate reserve, which is one practical way to keep easy sessions easy.
Yes. Beta-blockers slow the heart, so an age-based prediction will overstate what your heart can reach and the zones built on it will be too high. If you take them, ask your doctor how to judge exercise intensity; a rating of perceived exertion is a common alternative.
In the heat your body sends more blood to the skin to shed heat, so at the same pace your heart rate climbs. That means heart-rate zones read differently in a Singapore afternoon than in an air-conditioned gym. Slow down to keep your heart rate in the zone you intended, drink regularly, and give yourself time to acclimatise.
No. All inputs stay in your browser. Computation runs entirely client-side.
Heart rate variability, the variation between beats, is a different measure from maximum heart rate and is used by many wearables as a sign of recovery. This calculator does not measure or use it. Maximum heart rate sets the zone boundaries here; HRV is a separate signal some people use to decide how hard to train on a given day.
Tanaka, Monahan and Seals, J Am Coll Cardiol 2001;37:153-156. Gulati et al., Circulation 2010;122:130-137. Nes et al., Scand J Med Sci Sports 2013;23:697-704. Seiler, Int J Sports Physiol Perform 2010;5:276-291.
Method & sources
How it computes
RecaHeartRate: Tanaka 2001, Fox, Gulati 2010 and Nes 2013 side by side; the recommendation is Nes if the reader chooses trained, otherwise Gulati for women and Tanaka for men, and a trained woman is shown the Gulati figure beside Nes. Karvonen zones use the reader's resting rate, or 65 bpm by default.
What this tool implements
- The page told readers Nes 2013 was 'fitted to active adults' and 'validated on active adults', and the kernel described its cohort as selected for being active. Nes 2013 studied 3,320 healthy adults and found no interaction with activity or VO2max; Tanaka found the same. The routing is kept as a choice of study (a cohort with verified maximal efforts) and every sentence now says so. The kernel suite and its 42 mutations still pass.
- Tanaka 2001's 18,712 were pooled group means from 351 studies, cross-validated in 514 laboratory subjects; the page had called them 'validated against measured max HR across 18,712 subjects'. Nes reports SEE 10.8 bpm, which replaces an unsourced '±10-15 bpm' and a '68% within ±10' claim.
- Seiler 2010: about 80% of sessions at low intensity and 20% high, in elite athletes training 10-13 times a week, by lactate rather than HR zone. The page said '80% Z1-2, 20% Z4-5 has replaced older models'.
Sources
- Tanaka H, Monahan KD, Seals DR. Age-predicted maximal heart rate revisited. J Am Coll Cardiol 2001;37(1):153-156. https://doi.org/10.1016/s0735-1097(00)01054-8
- Gulati M, Shaw LJ, Thisted RA, Black HR, Bairey Merz CN, Arnsdorf MF. Heart rate response to exercise stress testing in asymptomatic women: the St. James Women Take Heart Project. Circulation 2010;122(2):130-137. https://doi.org/10.1161/CIRCULATIONAHA.110.939249
- Nes BM, Janszky I, Wisløff U, Støylen A, Karlsen T. Age-predicted maximal heart rate in healthy subjects: the HUNT Fitness Study. Scand J Med Sci Sports 2013;23(6):697-704. https://doi.org/10.1111/j.1600-0838.2012.01445.x
- Seiler S. What is best practice for training intensity and duration distribution in endurance athletes? Int J Sports Physiol Perform 2010;5(3):276-291. https://doi.org/10.1123/ijspp.5.3.276
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