Max Heart Rate Calculator
Calculate your maximum heart rate (MHR) from your age using any of five validated formulas, then see all five personalized training zones. Add your resting heart rate to switch from simple percentage zones to the more accurate Karvonen method, which accounts for your heart rate reserve.
Formula
Worked example
For a 35-year-old with a resting HR of 60 bpm: Tanaka gives 208 - 0.7 x 35 = 183.5, rounded to 184 bpm. Heart rate reserve = 184 - 60 = 124 bpm. Zone 3 (70-80% Karvonen) = (124 x 0.70) + 60 = 147 bpm to (124 x 0.80) + 60 = 159 bpm. Without resting HR, simple % of 184 gives 129-147 bpm for Zone 3.
Which max heart rate formula should you use?
Five validated formulas appear in the scientific literature, and this calculator supports all of them. The original Haskell & Fox rule (220 - age) from 1971 is the most widely recognized but was never derived from rigorous data: it over-estimates for younger athletes and under-estimates for older adults. The Tanaka, Monahan, and Seals formula (208 - 0.7 x age), published in 2001 from a meta-analysis of 351 studies, fits measured maxima more closely across the lifespan and is the default here. The Nes formula (211 - 0.64 x age), derived from a large Norwegian cohort study in 2013, is another well-validated linear option. The Inbar formula (205.8 - 0.685 x age) was developed in 1994 from a sample of healthy Israeli adults. The Oakland nonlinear formula (192 - 0.007 x age squared) captures the slight curvature in how maximum heart rate declines faster in older age groups. All age-based formulas share an important limitation: a standard deviation of roughly 10-12 bpm, meaning your personal maximum could sit 20 bpm above or below any estimate. A supervised graded exercise test is the only way to measure your true ceiling.
The Karvonen method: why resting heart rate matters
Simple training zones defined as a fixed percentage of MHR treat a sedentary person and a trained athlete identically if they share the same age. The Karvonen method, developed by Martti Karvonen in 1957, corrects this by using the heart rate reserve (HRR): the difference between your maximum and resting heart rates. A trained runner with a resting HR of 45 bpm and a max of 185 bpm has an HRR of 140 bpm, while a sedentary individual the same age with a resting HR of 75 bpm has only 110 bpm of reserve. Their Zone 2 (60-70% intensity) boundaries will differ meaningfully even though their MHR is the same. The Karvonen target is: (MHR - RHR) x intensity + RHR. Measure your resting heart rate first thing in the morning before getting out of bed, ideally averaged over three consecutive days, for the most stable reading.
Five training zones and what each one does
Zone 1 (50-60% of intensity) is very light recovery work: walking, easy cycling, or active cool-downs. It promotes blood flow and muscle repair without adding training stress. Zone 2 (60-70%) is the foundation of aerobic endurance, efficient for fat metabolism and building the mitochondrial density that underpins all higher-intensity work. Research consistently shows that elite endurance athletes spend 70-80% of their total training volume here. Zone 3 (70-80%) is moderate steady-state effort, often called the aerobic or tempo zone: sustainable for 30-60 minutes and effective for building aerobic capacity. Zone 4 (80-90%) sits at or near the lactate threshold: hard, sustained efforts lasting 10-30 minutes that improve your ability to tolerate and clear lactic acid. Zone 5 (90-100%) is maximum-effort intervals, rarely sustainable beyond a few minutes, reserved for VO2 max development and speed work.
How to use your zones in practice
Most beginner and intermediate training plans follow an 80-20 principle: roughly 80% of weekly volume in Zones 1-2 and 20% in Zones 3-5. This distribution balances adaptation and recovery. If you are new to heart rate training, start by spending two or three weeks entirely in Zone 2 to establish your aerobic base before introducing harder efforts. Use a chest-strap heart rate monitor for the most accurate real-time readings; optical wrist sensors can lag by several beats per minute during rapid intensity changes. If your measured heart rate consistently exceeds your Zone 3 target on what feels like an easy run, slow down: the aerobic base pays dividends long-term. A direct maximum heart rate test, such as a 3-minute all-out effort on a stationary bike after a proper warm-up, can replace the age estimate and make every zone boundary sharper.
Estimated max heart rate by age (five formulas)
| Age | Tanaka | Fox (220-age) | Nes | Inbar | Oakland |
|---|---|---|---|---|---|
| 20 | 194 | 200 | 198 | 192 | 189 |
| 25 | 191 | 195 | 195 | 189 | 188 |
| 30 | 187 | 190 | 192 | 185 | 186 |
| 35 | 184 | 185 | 189 | 182 | 183 |
| 40 | 180 | 180 | 185 | 178 | 181 |
| 45 | 177 | 175 | 182 | 175 | 178 |
| 50 | 173 | 170 | 179 | 172 | 175 |
| 55 | 170 | 165 | 176 | 168 | 171 |
| 60 | 166 | 160 | 173 | 165 | 167 |
| 65 | 163 | 155 | 169 | 161 | 162 |
| 70 | 159 | 150 | 166 | 158 | 158 |
All values in bpm, rounded to the nearest whole number. The Tanaka formula is recommended for adults over 40.
Frequently asked questions
Which max heart rate formula is the most accurate?
The Tanaka formula (208 - 0.7 x age) is the best validated for the general adult population, as it was derived from a meta-analysis of over 350 studies involving more than 18,000 subjects. The Nes formula (211 - 0.64 x age) from a large 2013 Norwegian cohort is a close second. The classic 220 - age rule is easy to remember but systematically over-estimates for younger people and under-estimates for those over 60. No age-based formula is highly accurate for any individual: all carry a standard deviation of roughly 10-12 bpm.
What is the Karvonen method and why is it better than simple percentages?
The Karvonen method calculates training zone targets using your heart rate reserve (HRR), which is your maximum heart rate minus your resting heart rate. The formula is: target HR = (HRR x intensity %) + resting HR. Because it anchors zones to your personal resting HR baseline, two people with the same max HR but different resting HRs will get different zone boundaries, making the zones more individually accurate. A well-trained athlete with a low resting heart rate gets wider zones with higher absolute bpm targets at the same percentage intensity.
How do I measure my resting heart rate accurately?
Measure your resting heart rate first thing in the morning before getting out of bed, ideally after at least five minutes of lying still. Count your pulse for a full 60 seconds, or count for 15 seconds and multiply by four. For the most stable reading, average three consecutive morning measurements. Normal resting heart rate for adults is 60-100 bpm; well-trained endurance athletes often measure 40-60 bpm.
Does fitness training increase my maximum heart rate?
No. Maximum heart rate is primarily set by age and genetics and gradually declines at roughly 1 bpm per year in adulthood. Regular aerobic training lowers your resting heart rate and increases your stroke volume, which improves performance, but it does not raise the MHR ceiling. This means a fit person with a low resting HR has a larger heart rate reserve and effectively has more room to work in each training zone.
How do I find my true maximum heart rate without a lab test?
A practical field test: after a thorough 10-minute warm-up, run a hard 3-minute effort at near-maximal intensity, rest for 2 minutes, then sprint all-out for 30 seconds. The highest heart rate your monitor records during or just after the sprint is close to your true maximum. Repeat the test on a different day if you want confirmation. Do not attempt this without prior fitness training, and stop if you feel chest pain, dizziness, or severe shortness of breath.
What is a normal maximum heart rate for my age?
Using the Tanaka formula: at age 20 your estimated MHR is about 194 bpm, at 30 about 187 bpm, at 40 about 180 bpm, at 50 about 173 bpm, at 60 about 166 bpm, and at 70 about 159 bpm. Remember the formula has a standard deviation of 10-12 bpm, so individual variation is normal and expected.