Tools that pair with your Apple Watch
Your Apple Watch already records the numbers that matter most for everyday health — resting heart rate, cardio fitness, and daily steps. These calculators help you make sense of those numbers without a spreadsheet or a subscription. Type in what your watch shows and get an instant, plain-English read on where you stand.
Each calculator on this page runs entirely in your browser; values entered into a calculator are not submitted by its calculation code. The Health Genie app has separate data flows for AI, account, analytics and encrypted-storage features, described in the Privacy Policy.
Frequently asked questions
Are these health calculators free?
Yes. Every calculator on this page is free to use, runs entirely in your browser, and requires no sign-up. None of the values you enter are stored or sent anywhere.
Do these calculators need an Apple Watch?
No. The calculators work with numbers you type in, so anyone can use them. They are designed to pair well with figures an Apple Watch reports — such as resting heart rate, cardio fitness (VO2 max) and daily steps — but a watch is not required.
How accurate are the results?
The calculators use established formulas and published reference ranges, so results are good estimates for general wellness and education. They are not medical measurements, and individual physiology varies. For health concerns, speak with a doctor.
One number, every morning
Health Genie reads your Apple Watch steps and resting heart rate and gives you a single Vitality Score each morning — no dashboards to decode.
View Health Genie on the App Store