Heart Rate Calculator

What Is a Heart Rate Calculator?

A heart rate calculator estimates important heart rate measurements that can be useful when planning or monitoring exercise. By entering your age, you can calculate an estimated maximum heart rate and use it to establish general exercise intensity zones.

Providing your resting heart rate allows the calculator to use the heart rate reserve method, which takes your resting heart rate into account when estimating exercise zones. The results are estimates rather than measurements of your actual maximum or ideal heart rate.

Why Use the Heart Rate Calculator?

The calculator provides a quick way to estimate maximum heart rate and exercise intensity ranges without manually applying heart rate formulas.

How to Use the Heart Rate Calculator

Enter your age and, if available, your resting heart rate. Select the maximum heart rate formula you want to use, then calculate your estimated heart rate zones.

1. Enter your age — Enter your age in years.
2. Enter your resting heart rate — Optionally enter your resting heart rate in beats per minute. This allows the calculator to use heart rate reserve for the target zones.
3. Select a formula — Choose either the 220 minus age formula or the Tanaka formula for the estimated maximum heart rate.
4. Calculate your results — Select “Calculate Heart Rate” to view your estimated maximum heart rate and target exercise zones.

Understanding Maximum Heart Rate and Target Heart Rate Zones

Maximum heart rate is the highest number of beats per minute your heart is expected to reach during maximal physical effort. It is commonly estimated using age-based formulas because directly determining maximum heart rate generally requires a controlled exercise test. Age-based calculations are useful as general guides, but they cannot predict an individual's exact maximum heart rate.

Target heart rate zones divide exercise intensity into ranges based on estimated maximum heart rate. These ranges can help people structure cardiovascular exercise by distinguishing lighter activity from moderate, hard and very intense effort.

220 Minus Age Formula

The traditional 220 minus age formula estimates maximum heart rate by subtracting a person's age from 220. For example, a 40-year-old person would have an estimated maximum heart rate of 180 bpm using this formula. The formula is simple and widely recognised, but individual results can vary considerably.

Tanaka Maximum Heart Rate Formula

The Tanaka formula estimates maximum heart rate as 208 minus 0.7 multiplied by age. It provides an alternative to the traditional 220 minus age calculation. Neither formula should be interpreted as a direct measurement of an individual's true maximum heart rate.

How Heart Rate Zones Are Calculated

When a resting heart rate is provided, this calculator uses the heart rate reserve method to estimate exercise zones. Heart rate reserve is calculated by subtracting resting heart rate from estimated maximum heart rate. Each target zone is then calculated by applying the relevant intensity percentage to the heart rate reserve and adding the resting heart rate.

For example, the lower boundary of a 70% zone is calculated as resting heart rate plus 70% of the difference between estimated maximum heart rate and resting heart rate. This produces a more individualised estimate than simply applying percentages to maximum heart rate alone.

If no resting heart rate is entered, the calculator uses percentages of estimated maximum heart rate to produce the five target zones. For this reason, entering a reliable resting heart rate can provide a more personalised exercise-zone estimate.

Heart rate can be affected by factors including exercise intensity, fitness, temperature, stress, dehydration, illness, caffeine and medications. Wearable devices and heart rate monitors can also have limitations. These results should therefore be treated as estimates rather than precise physiological measurements.

Frequently Asked Questions