Cardiology · Sports Medicine

Karvonen Target Heart Rate calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Kthr Age Years (years)

Kthr Resting Hr (bpm)

Kthr Intensity Percent (%)

Result

Complete all required inputs to calculate the score.

Formula inputs

Kthr Age Years (years)Accepted range: 10 to 90
Kthr Resting Hr (bpm)Accepted range: 40 to 120
Kthr Intensity Percent (%)Accepted range: 40 to 95

Primary source

Karvonen MJ et al. The effects of training on heart rate. Ann Med Exp Biol Fenn. DOI: 10.1080/00365521.1957.11812784. PMID: 13426654. Scope: Target HR = (HRmax − HRrest) × intensity fraction + HRrest; HRmax estimated as 220 − age. (1957)

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