The most common formula for estimating your maximum heart rate is 220 minus your age. For a 35-year-old, that’s 185 bpm. The formula is fast, easy, and on every fitness watch in the world — but it’s also wrong by an average of 10-15 bpm for any individual, and the error has been documented in peer-reviewed research since at least 2001.
This guide covers why the 220-minus-age formula is so popular despite being inaccurate, the three formulas that actually outperform it (Tanaka, Gulati, and Nes), how to find your true max heart rate experimentally, and how to use max HR to set training zones that actually match your physiology.
Max Heart Rate By Age — The 220-Minus-Age Formula
| Age | 220 – age formula (bpm) | Realistic typical range (bpm) |
|---|---|---|
| 20 | 200 | 185-205 |
| 25 | 195 | 181-200 |
| 30 | 190 | 178-196 |
| 35 | 185 | 174-192 |
| 40 | 180 | 170-188 |
| 45 | 175 | 167-184 |
| 50 | 170 | 163-180 |
| 55 | 165 | 159-176 |
| 60 | 160 | 156-172 |
| 65 | 155 | 152-168 |
| 70 | 150 | 148-164 |
The Honest Truth About Max Heart Rate Formulas
1. The 220-minus-age formula was an estimate, not a measurement
The “220 minus age” formula traces back to a 1971 paper by Fox, Naughton, and Haskell. They didn’t run a study to derive it — they cited 11 small unpublished studies and produced a rule of thumb. The formula stuck because it was simple. Tanaka, Monahan, and Seals (2001) later analyzed 351 published studies and 18,712 individuals and found the formula systematically overestimates max HR in young adults and underestimates it in older adults.
2. The Tanaka formula is more accurate
Tanaka formula: 208 − (0.7 × age)
For a 35-year-old: 208 − (0.7 × 35) = 184 bpm (vs. 185 from 220-age — almost identical at this age). The two formulas diverge significantly for older adults: at age 60, 220-age gives 160 bpm but Tanaka gives 166 bpm. The Tanaka formula has a standard error around 7 bpm in the original study population.
3. The Gulati formula is more accurate for women
Gulati formula (women only): 206 − (0.88 × age)
Derived from 5,437 women in the St. James Women Take Heart Project (Gulati et al., 2010), this formula corrects for the systematic overestimate of female max HR in 220-age. For a 40-year-old woman: 206 − (0.88 × 40) = 171 bpm vs. 180 from 220-age — a 9-bpm difference that significantly changes training zones.
4. The Nes formula uses BMI for fitness adjustment
Nes formula: 211 − (0.64 × age)
Derived from a Norwegian HUNT study of 3,320 adults (Nes et al., 2013), this is currently considered the most accurate population-level formula for adults of mixed sex. Standard error around 10 bpm. The HUNT3 follow-up extended it with BMI and activity-level adjustments — but for most runners, the base formula is enough.
All Four Formulas Compared
| Age | 220 – age | Tanaka (208 – 0.7×age) | Gulati (women) | Nes (211 – 0.64×age) |
|---|---|---|---|---|
| 25 | 195 | 191 | 184 | 195 |
| 35 | 185 | 184 | 175 | 189 |
| 45 | 175 | 177 | 166 | 182 |
| 55 | 165 | 170 | 158 | 176 |
| 65 | 155 | 162 | 149 | 169 |
For most runners under 40, all four formulas land within 6-8 bpm of each other. The differences become significant for older runners and women, where 220-age can be off by 10+ bpm.
How To Find Your Actual Max Heart Rate (Field Test)
The only way to know your true max HR is to measure it directly. The most reliable field test for runners:
- Warm up properly: 15 minutes of easy jogging plus 4-5 short strides at increasing pace. Don’t skip this.
- Run a 3-minute hard effort uphill on a moderate gradient (5-8%). Push hard but controlled.
- Recover for 90 seconds by jogging downhill or on flat.
- Run a second 3-minute hard effort uphill — harder than the first. The last 30 seconds should be all-out.
- Note the highest number on your heart rate monitor within those final seconds. That’s your tested max HR (or very close to it).
Most field-test results land 3-7 bpm below true lab-tested max HR. Add 5 bpm to your field-test number for a usable max HR estimate.
Don’t do this test if: you have a known cardiovascular condition, you’re a true beginner (less than 6 months of running), you’re recovering from illness, or you haven’t had a recent doctor’s check-up if you’re over 50.
How To Use Max Heart Rate To Set Training Zones
Once you have a max HR estimate, you can derive 5 training zones (the most common framework):
| Zone | % of max HR | Effort | Use |
|---|---|---|---|
| Z1 | 50-60% | Very easy | Warm-up, recovery, walk pace |
| Z2 | 60-70% | Easy, conversational | The bulk of your weekly mileage |
| Z3 | 70-80% | Steady, harder talking | Marathon-pace work, tempo runs |
| Z4 | 80-90% | Hard, breath-by-sentence | Threshold + lactate work |
| Z5 | 90-100% | Maximal | VO2 max intervals |
For most runners, 80% of weekly mileage should sit in Z1-Z2 (the well-known “80/20 rule”). Z4 and Z5 work should make up no more than 10-15% of your weekly volume — they’re high-stress and require recovery to absorb.
FAQs
Why is my max HR higher than 220 minus my age?
That’s normal — 220-age is an underestimate for many people, especially women and trained athletes. It can be off by 10-15 bpm in either direction for any individual. Use the Tanaka or Nes formula for a closer estimate, or do a field test for your true number.
Does max heart rate decline with training?
Slightly — trained runners often have a max HR 3-7 bpm lower than untrained peers of the same age. This is because the heart becomes more efficient (higher stroke volume) and recruits less heart-rate response at maximal effort. It’s an adaptation, not a problem.
My watch says my max HR is 230. Is that real?
Almost certainly a sensor error. Wrist-based heart rate monitors are notoriously unreliable, especially during high-intensity efforts when your wrist flexes. A spike to 230 bpm is almost always cadence-locked sensor noise (your stride frequency tricking the watch). Use a chest strap for accurate max HR readings.
