Max Heart Rate Calculator

Your estimated max heart rate is 220 minus your age, or 208 minus 0.7 times your age, or 206 minus 0.88 times your age, depending on which formula you trust. For a 40-year-old that is 180, 180 and 171. The calculator above prints all three, builds five training zones from the Tanaka estimate, and if you type in the highest number a chest strap ever showed you, it tells you how far each formula missed.

Max heart rate calculator: what it does

Enter your age. That is the whole requirement. You get the 220-minus-age number, the Tanaka number and the Gulati number in beats per minute, then Zone 1 through Zone 5 as percent-of-max bands built on Tanaka, since it holds up best across the age range. Add a resting heart rate and the zones switch to heart rate reserve, the Karvonen method, which counts up from your resting rate instead of from zero and lands each band a few beats higher. Add an observed max from a hard session and the calculator rebuilds every zone on that number and shows the gap to each formula, signed, so you can see which way the textbook missed you.

Three formulas by age

All figures in beats per minute. Read across any row. At 20 the formulas disagree by 12 beats. At 40 the first two agree and Gulati sits 9 lower. By 70 the order has flipped, with Tanaka 9 beats above the gym-poster number. None of that spread is your body. It is three lines drawn through three different piles of data, and the piles disagree about the slope.

Where the formulas come from

220 minus age was never a study. It came from a line eyeballed through pooled data around 1971, it stuck because you can do it in your head, and it runs high for people in their twenties and low for anyone past 40, which is the worst possible shape for a formula most people first meet at 45. Tanaka, Monahan and Seals published 208 minus 0.7 times age in 2001, a meta-analysis of 351 studies and 18,712 people, and it is the default in current ACSM guidance. Gulati and colleagues derived 206 minus 0.88 times age in 2010 from 5,437 women in the St James Women Take Heart project, because the older formulas had been fitted mostly to men and were sending women to the wrong heart rate targets in stress tests. If you are a woman, Gulati is the closer starting point. If you are a man, Tanaka.

Why an observed max beats all three

Population scatter around any of these lines is roughly 10 to 12 beats, and that is one standard deviation, so a third of people sit further out than that and two healthy 40-year-olds can have true maxes of 165 and 195 with nothing wrong with either heart. Max heart rate is inherited. Training barely moves it. The formula cannot see any of this. A chest strap can.

Here is the session. Warm up 15 minutes easy, then find a hill that takes two to three minutes to climb. Go up hard, jog down, go up harder, jog down, then a third time all out with the last 30 seconds as ugly as you can make it. The highest reading on that last repeat is your working max. A 5 km race run properly gets you within a beat or two as well, and the final rep of a hard interval session often does. Wear a chest strap, not the wrist: optical sensors lag and drop out at the exact moment you need them.

One more honest thing. Most people never touch their true max in training. The hill session gets you within two or three beats if you go through with the last rep, and everything else you do, steady intervals, tempo runs, every easy day, sits far below it. So if the highest number in your watch history is 178 and the formula says 180, do not assume the formula is right and you were lazy. Assume the 178 is closer and train off it.

Turning the max into zones

Once you have a number you trust, the zone maths is quick. Percent of max gives Zone 2 at 60 to 70 percent, which for a max of 186 is 112 to 130 bpm. Heart rate reserve gives the same zone as 60 to 70 percent of the gap between resting and max, added back on top of resting, so with a resting rate of 50 the band moves to 132 to 145 bpm. Twenty beats. A fit person with a low resting rate is underestimated by the plain percent method in every zone, which is the case for entering your resting heart rate. The heart rate zone calculator does the full five-zone build with a threshold option as well, and the Zone 2 calculator checks your easy ceiling against a real 50-minute session using heart rate drift.

What max heart rate does not tell you

A high max is not fitness. A low max is not a problem. The number says nothing about your aerobic capacity, your threshold or how fast you run; a 60-year-old with a max of 155 can hold a higher percentage of it for an hour than a 25-year-old with a max of 200. If you want the engine size, run a field test. The Cooper test, the Rockport walk test and the Queens College step test each return an estimated VO2 max, and the Harvard step test scores how fast your heart recovers. Max heart rate is the anchor for zones. Nothing more.

How Movement Rebels fits

The coach reads heart rate, HRV and resting heart rate from synced Garmin Connect and Apple Health data, along with your last 14 activities and the morning readiness check-in. It works from the heart rate your sessions produced. It does not re-estimate a max from your age, and it re-estimates nothing you did not sync. Set your zones on the watch from a measured max and the coach plans against the same bands you see on the wrist.

The three formulas, written out

Training zones from the Tanaka estimate

Percentages of maximum heart rate, beats per minute. Percentage of heart rate reserve (the Karvonen method) puts the same zones a few beats higher and is what the calculator uses when you enter a resting heart rate.

Questions

More heart & recovery tools