The most widely used formula for estimating maximum heart rate is 220 minus your age. A 40-year-old would get 180 beats per minute (bpm). It’s simple and reasonably close for most people, but it’s not the only option, and newer formulas tend to be more accurate, especially if you’re over 40 or female.
The Standard Formula: 220 Minus Age
This equation has been the default in gyms, fitness trackers, and doctor’s offices for decades. You subtract your age from 220 and get an estimate of the highest heart rate your heart can sustain during all-out effort. For a 30-year-old, that’s 190 bpm. For a 55-year-old, it’s 165 bpm.
The formula works as a rough guide, but it has a known flaw: it tends to underestimate max heart rate in older adults. If you’re 60 and using 220 minus age, your estimate is 160 bpm. Your actual max could be noticeably higher. That matters because it skews your training zones and can make a stress test look more alarming than it should be.
The Tanaka Formula: A More Accurate Update
A large meta-analysis published in the Journal of the American College of Cardiology found that a revised equation fits the data better across age groups:
208 minus (0.7 × age)
For a 40-year-old, this gives 180 bpm, identical to the old formula. But the gap widens with age. A 60-year-old gets 166 bpm instead of 160, and a 70-year-old gets 159 instead of 150. The correlation between age and max heart rate in that analysis was very strong (r = −0.90), meaning age is by far the biggest predictor, but the rate of decline is gentler than the old formula assumed.
If you’re choosing one formula for general use, this is the better pick.
A Separate Formula for Women
Both the 220-minus-age and Tanaka formulas were developed primarily from data on men. Research from the St. James Women Take Heart Project, which followed 5,437 healthy women ages 35 and older, produced a sex-specific equation:
206 minus (0.88 × age)
For a 45-year-old woman, this gives about 166 bpm. The standard formula would give 175. That’s a meaningful difference when you’re setting training zones or interpreting a treadmill stress test. Women generally have a slightly lower peak heart rate at the same age, and using a male-derived formula can set unrealistic targets.
Quick Reference by Age
- Age 25: Standard: 195 | Tanaka: 190 | Women’s: 184
- Age 35: Standard: 185 | Tanaka: 183 | Women’s: 175
- Age 45: Standard: 175 | Tanaka: 176 | Women’s: 166
- Age 55: Standard: 165 | Tanaka: 169 | Women’s: 158
- Age 65: Standard: 155 | Tanaka: 162 | Women’s: 149
Why Every Formula Has a Margin of Error
No prediction equation is precise for every individual. The American College of Sports Medicine notes that all max heart rate formulas carry a standard error of 3 to 12 bpm. That means your true max could be a full 10 beats higher or lower than any formula suggests. Two 50-year-olds with the same fitness level can have genuinely different maximum heart rates based on genetics, heart size, and the health of their cardiac electrical system.
The only way to know your actual max heart rate is through a graded exercise test, where you push to true maximal effort on a treadmill or bike while connected to a heart rate monitor. Short of that, a well-chosen formula gives you a useful working estimate.
Why Max Heart Rate Drops With Age
The decline isn’t about fitness. It’s structural. Your heart has a natural pacemaker called the sinoatrial node, a cluster of specialized cells that sets your heart’s rhythm. Over time, some of those cells are replaced by fibrous tissue and fat deposits, and the electrical pathways that carry signals through the heart slow down slightly. This happens in healthy, active people too. You can’t train your way to a higher max heart rate, though staying fit improves how efficiently your heart works at every heart rate below the max.
When These Formulas Don’t Apply
If you take beta-blockers for blood pressure, heart rhythm, or anxiety, your max heart rate will be artificially suppressed. These medications slow the heart rate at rest and during exertion, and there’s no reliable way to adjust a formula to account for them. You may never reach a calculated target no matter how hard you push. In that case, a perceived exertion scale (like the Borg scale, which rates effort from 6 to 20) is a better way to gauge workout intensity. You focus on how hard the effort feels rather than chasing a number on a heart rate monitor.
Fitness level, on the other hand, does not meaningfully change your max heart rate. A sedentary person and a competitive runner of the same age will typically hit similar peaks. What differs is how long they can sustain effort near that ceiling and how quickly their heart rate recovers afterward.
How to Use Your Max Heart Rate
Most people calculate max heart rate so they can set training zones. The common framework breaks effort into percentages of your max:
- 50 to 60%: Light activity, warm-ups, recovery walks
- 60 to 70%: Fat-burning zone, comfortable steady-state cardio
- 70 to 80%: Aerobic zone, the sweet spot for building cardiovascular fitness
- 80 to 90%: Threshold training, hard but sustainable for short periods
- 90 to 100%: Near-max effort, sprints and high-intensity intervals
If your estimated max is 180, your aerobic zone falls between 126 and 144 bpm. That’s the range where most endurance training happens. You don’t need to be exact. A zone based on an estimate within 5 to 10 beats is still useful for pacing long runs, cycling, or any sustained cardio. If your chest strap or watch shows a number that feels way off from your perceived effort, trust how your body feels over the formula.