What This Calculator Does
The Percentage of Max Heart Rate Calculator estimates the heart rate (in beats per minute) you should aim for during exercise at a chosen training intensity. It first estimates your maximum heart rate from your age, then multiplies it by the percentage you want to train at. This is widely used to set cardio training zones for fat burning, endurance, and high-intensity work.
How to Use It
Enter your age in years and the intensity you want to train at as a percentage of your maximum heart rate (for example 70 for a moderate zone). The calculator returns your target heart rate in beats per minute along with your estimated maximum heart rate. Common zones are roughly 50-60% (very light), 60-70% (fat burn), 70-80% (aerobic/endurance), and 80-90% (anaerobic).
The Formula Explained
Maximum heart rate is estimated with the classic Fox formula: \(\text{Max HR} = 220 - \text{age}\). Your target is then $$\text{Target HR} = \text{Max HR} \times \frac{\text{intensity}}{100}$$ This is a population average estimate; individual maximums can vary by 10-20 bpm, so use it as a guide rather than an exact limit.
Worked Example
A 40-year-old wants to train at 75% intensity. $$\text{Max HR} = 220 - 40 = 180 \text{ bpm}$$ $$\text{Target HR} = 180 \times 0.75 = 135 \text{ bpm}$$ So they should aim to keep their heart rate around 135 beats per minute.
FAQ
Is 220 minus age accurate? It is a useful average but not exact for everyone. Formulas like Tanaka (\(208 - 0.7 \times \text{age}\)) may fit some people better.
What intensity should I pick? For general fitness, 60-80% is common. Higher percentages increase intensity and effort.
Should I see a doctor first? If you have heart conditions or are new to exercise, consult a healthcare professional before high-intensity training.
