Heart rate zones
Five zones, by Karvonen or by plain percentage.
VO₂ max
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All tools › Fitness
Three field tests, and where the result sits for your age.
It runs entirely in this browser tab: what you type is never uploaded, and the tool makes no network request while it works. Open your browser's network panel and try it — nothing leaves the page. There is no sign-up and no account.
Heart rate zones
Five zones, by Karvonen or by plain percentage.
Maximum heart rate
Five estimates, and the twelve beats of error on all of them.
One-rep max
Four formulas, the whole percentage table and the plates to load.
Calories burned
An hour of something, from the metabolic-equivalent table.
Steps to distance
A pedometer's number, through a stride you measured or estimated.