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Target Heart Rate Calculator (Karvonen)

Training heart-rate target using heart-rate reserve.

Use the Karvonen formula to compute a target heart rate that respects your resting heart rate, not just your age.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

years
bpm
%

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Karvonen: THR = ((HRmax − HRrest) × intensity%) + HRrest. HRmax defaults to 208 − 0.7·age if not given.

In depth

Use the Karvonen formula to compute a target heart rate that respects your resting heart rate, not just your age.