Required. Age range: 10–100 years
Enables Karvonen zone calculation. Measure first thing in the morning before getting out of bed.
Enter Your Age to Begin
Enter your age and select your biological sex to calculate your maximum heart rate and personalized training zones.
How to Use the Max Heart Rate Calculator
Enter Your Age and Select Your Sex
Type your age in years (10–100) and click Male or Female. Your biological sex affects which gender-specific formulas apply — the Gulati formula for women and sex-differentiated Fairbarn and Whyte formulas use different equations for men and women. The calculator automatically selects the Tanaka formula as the default, which is the most widely recommended age-based formula by exercise science organizations.
Choose a Formula or Enter Your Tested Max HR
If you have never had your maximum heart rate tested, leave the formula toggle off and use Tanaka (the recommended default). If you have completed a maximal field test like an all-out one-mile run or a graded exercise test in a lab, toggle on 'I know my max heart rate' and enter that measured value — it will be more accurate than any formula. Women may benefit from switching to the Gulati formula, which was validated specifically for female populations.
Add Your Resting Heart Rate for Karvonen Zones
Entering your resting heart rate unlocks the Karvonen method, which produces more personalized training zones. Measure your resting HR first thing in the morning before getting out of bed — lie still for two minutes, then count your pulse for 60 seconds or use a heart rate monitor. Average readings over three consecutive mornings for the most reliable value. The calculator will display both standard (percentage of MHR) and Karvonen (percentage of heart rate reserve) zones side by side.
Set Your Training Goal and Review Your Zones
Select your primary training goal — Fat Loss, Endurance, Performance, or Intervals. The calculator highlights the most relevant training zone for your goal: Zone 2 for fat loss (fat oxidation peaks here), Zone 3 for endurance base, Zone 4 for performance and lactate threshold, or Zone 5 for interval training. Review the full formula comparison table to understand the range of MHR estimates, use the custom intensity slider to find the target heart rate for any specific workout intensity, and export your results to CSV for use in training logs or coaching apps.
Frequently Asked Questions
Is the 220 minus age formula accurate?
The Fox formula (220 minus age) is by far the most widely known maximum heart rate formula, but it is one of the least accurate for people at the extremes of the age spectrum. It was derived from a convenience sample rather than a controlled study, and subsequent research showed it overestimates MHR for adults under 30 and significantly underestimates it for adults over 50 or 60. The Norwegian University of Science and Technology's HUNT Study found differences of up to 40 beats per minute in older adults. For this reason, the American College of Sports Medicine now recommends the Tanaka formula (208 minus 0.7 times age), which was derived from a meta-analysis of 351 studies with over 18,000 subjects and has substantially lower error across the full age range.
What is the Karvonen method and why is it more accurate?
The Karvonen method, developed by Finnish physician Martti Karvonen, calculates target training zones based on Heart Rate Reserve (HRR) rather than a simple percentage of maximum heart rate. HRR is the difference between your maximum heart rate and your resting heart rate. Your target zone equals your resting HR plus a percentage of HRR. The advantage is that it accounts for individual fitness level: a highly trained athlete with a resting heart rate of 42 bpm and a sedentary beginner with a resting heart rate of 78 bpm will have very different Zone 2 targets, even at the same age and maximum heart rate. Standard percentage-of-MHR zones ignore this difference entirely. Karvonen zones typically feel more accurate and align better with perceived exertion, especially for people with unusually high or low resting heart rates.
How do I measure my resting heart rate accurately?
For the most accurate resting heart rate measurement, take it first thing in the morning before getting out of bed. Lie still for at least two minutes after waking, then measure your pulse for a full 60 seconds. You can use a fingertip on your wrist (radial pulse) or neck (carotid pulse) and count manually, or use a heart rate monitor or smartwatch. Single measurements can vary due to sleep quality, hydration, stress, and caffeine intake from the previous day. For the most reliable value, average your readings over three to five consecutive mornings under similar conditions. A typical resting heart rate for healthy adults ranges from 60 to 100 bpm, while well-trained endurance athletes often see values of 40 to 60 bpm.
How do I find my true maximum heart rate through a field test?
If you want a more accurate maximum heart rate than any formula can provide, a field test is your best option outside a clinical laboratory. For runners, warm up thoroughly for 15 to 20 minutes at easy pace, then run a hard 1-mile effort at maximum effort while monitoring heart rate, or complete 3 repetitions of a 400-meter sprint with 1-minute recovery between each. Your highest reading during the final effort is your approximate MHR. For cyclists, a 5-minute all-out effort on a steady hill or trainer after a proper warm-up works well. Note that field tests require you to be well-rested and fully healthy — illness, fatigue, or dehydration will suppress your maximum readings. If you have any cardiovascular health concerns, consult your physician before attempting a maximal test.
Why does my training goal change which zone is highlighted?
Different training goals are best served by different heart rate zones because each zone triggers distinct physiological adaptations. Fat loss is most efficient in Zone 2 (60–70% MHR) because at this lower intensity, fat oxidation contributes the largest proportion of total energy. Although higher-intensity zones burn more total calories per minute, they rely increasingly on carbohydrate rather than fat as fuel, and may also suppress recovery. Endurance athletes benefit from spending large volumes of time in Zone 3 (70–80% MHR), which builds cardiovascular efficiency. Performance athletes targeting speed and race-pace fitness train Zone 4 (80–90% MHR), the lactate threshold zone. Interval-focused training targets Zone 5 (90–100% MHR) to develop VO2 max and anaerobic capacity. The goal selection highlights your primary zone and shows the specific heart rate range to target.
How do beta-blocker medications affect maximum heart rate?
Beta-blocker medications (such as metoprolol, atenolol, carvedilol, and bisoprolol) work by blocking adrenaline receptors in the heart, which reduces both resting and maximum heart rate. The effect on maximum heart rate is typically a reduction of 20 to 30 beats per minute compared to your age-predicted estimate. This means that standard heart rate zone calculations will be significantly inaccurate for anyone on beta blockers — your perceived exertion will not match the percentages of your formula-estimated MHR. If you take beta blockers, you should either use a field-tested maximum heart rate value (performed under your current medication regimen) or work with your physician and a certified exercise physiologist to establish appropriate training targets using perceived exertion (RPE scale) alongside heart rate. Never adjust beta-blocker dosing without medical supervision.