Target Heart Rate Calculator

Calculation method: The formula style used to build your target zone. The simple method uses age only. Heart rate reserve also uses your resting pulse.

Age (years): Your current age in years. Whole years are typical, but decimals can still be calculated.

Intensity target: The exercise effort range you want. Moderate is 50% to 70%, vigorous is 70% to 85%, and full target zone is 50% to 85%.

Resting heart rate (beats per minute): Your pulse when calm and fully at rest.

Estimated maximum heart rate: A formula-based estimate of the highest heart rate used to create the zone.

Target zone lower bound: The lower end of your selected exercise range in beats per minute.

Target zone upper bound: The upper end of your selected exercise range in beats per minute.

Simple age-based comparison zone: A side-by-side zone shown in heart rate reserve mode so you can compare the two methods.

Mistake: Leaving Calculation method on the wrong option and entering a Resting heart rate (beats per minute) that you expected to be used.
Fix: If you want resting pulse included, switch Calculation method to Heart rate reserve .

Mistake: Typing an unrealistic Age (years) such as 0, a negative number, or a value above normal human age ranges.
Fix: Enter a realistic age from 1 to 120 in Age (years) .

Mistake: Measuring Resting heart rate (beats per minute) right after walking, caffeine, stress, or exercise.
Fix: Recheck Resting heart rate (beats per minute) when fully at rest, often first thing in the morning.

Mistake: Choosing the wrong Intensity target and then thinking the calculator is off because the zone looks too easy or too hard.
Fix: Use Moderate (50% to 70%) for a steadier effort, Vigorous (70% to 85%) for harder exercise, or Full target zone (50% to 85%) to see the whole range.

Mistake: Reading Selected intensity range as your actual measured effort instead of the percent range used to build the estimate.
Fix: Treat Selected intensity range as the calculation setting, and use Target zone lower bound and Target zone upper bound as the beats-per-minute guide.

Mistake: Thinking Estimated maximum heart rate is your true tested maximum heart rate.
Fix: Use Estimated maximum heart rate as a guide for this calculator only, and read Method note for how the zone was built.

• Results are estimates for aerobic exercise guidance, not a direct measurement of your personal maximum heart rate.
• The simple method uses age alone, so it may be less personalized than heart rate reserve.
• Heart rate reserve depends on Resting heart rate (beats per minute), so a rushed or non-resting measurement can shift the zone.
• If your resting heart rate is greater than or equal to the estimated maximum in heart rate reserve mode, the calculator should return an error because the reserve would be zero or negative.
• Medicines that affect heart rate, some health conditions, heat, stress, and dehydration can make real exercise heart rate differ from the estimate.
• Rounding changes only how results are displayed. The calculator should keep full precision in the math until the final display step.
• The selected intensity bands are fixed at moderate 50% to 70%, vigorous 70% to 85%, and full target zone 50% to 85%.

How the calculator works

The calculator uses one of two standard approaches. The simple age-based method estimates maximum heart rate from age, then takes a percentage of that estimate. The heart rate reserve method first estimates maximum heart rate, subtracts your resting heart rate to get your reserve, then adds resting heart rate back after applying the chosen intensity. Mayo Clinic shows the heart rate reserve approach with the 208 minus 0.7 times age estimate for maximum heart rate [1].

Intensity bands used

Moderate = 50% to 70%

Vigorous = 70% to 85%

Full target zone = 50% to 85%

Simple age-based method

HRmax = 220 - age

target low = HRmax x p_low

target high = HRmax x p_high

Example: if Age (years) is 35 and Intensity target is moderate, then estimated maximum heart rate is 220 - 35 = 185 beats per minute. The moderate zone is 185 x 0.50 = 92.5 and 185 x 0.70 = 129.5, which displays as 93 to 130 with nearest-whole rounding.

Heart rate reserve method

HRmax = 208 - 0.7 x age

HRR = HRmax - resting heart rate

target low = resting heart rate + HRR x p_low

target high = resting heart rate + HRR x p_high

Example: if Age (years) is 40, Resting heart rate (beats per minute) is 60, and Intensity target is moderate, then estimated maximum heart rate is 208 - 0.7 x 40 = 180. Heart rate reserve is 180 - 60 = 120. The target zone is 60 + 120 x 0.50 = 120 and 60 + 120 x 0.70 = 144, so the displayed zone is 120 to 144.

Displayed outputs

Estimated maximum heart rate is the method-specific estimated max used in the math. Selected intensity range reports the midpoint percent of the chosen band, so moderate shows 60%, vigorous shows 77.5%, and full target zone shows 67.5%. In heart rate reserve mode, Simple age-based comparison zone is also shown so users can compare the quick method with the more personalized method.

Assumptions used

The calculator accepts age from 1 to 120 years. In heart rate reserve mode, Resting heart rate (beats per minute) must be positive and lower than the estimated maximum heart rate. Rounding is applied only to the final displayed beats per minute, not to the intermediate calculations. Real exercise heart rate can differ because of fitness level, medication effects, illness, temperature, stress, and how accurately resting pulse was measured.