Here’s a calculator using the Karvonen formula method. This method quickly calculates your target heart rate. This is the most accurate way of measuring your target heart rate.

This calculator uses the 4 step method of determining your target heart rate using the HHR or Karonen method. This method not only considers your age, but your resting heart rate. When using the Karvonen formula, the resting heart rate is subtracted from the maximal heart rate.

Here’s how to use this calculator:

1. Enter your age in the box.

2. Enter your resting heart rate