Features
- Answer updates as you type.
- Clear breakdown you can copy.
- Works on phone and desktop.
Free and private
The calculation runs in your browser. Nothing you type is sent or stored, and there is no limit.
Questions
Which formula?
Tanaka (208 − 0.7 × age), more accurate than 220 − age; Karvonen when you enter a resting rate.
Is it free?
Yes - free and unlimited, with no sign-up and no watermark.