Pick your device below. Each guide explains exactly what its scores measure, how they're weighted, and where they fall short — so you can read your own numbers correctly.
Readiness Score, Sleep Score, and Activity Score — what inputs they use and how they're weighted.
Read guide →Recovery Score, Strain, and Sleep Performance — how Whoop's algorithm scores your day.
Read guide →Body Battery, Training Readiness, and HRV Status — what feeds each number.
Read guide →Heart rate, HRV, and sleep stages — what Apple Watch measures and how accurate it is.
Read guide →Fitbit-powered readiness, sleep, and heart rate metrics — explained.
Read guide →If you don't know where to start, HRV and Readiness/Recovery scores are the two numbers most wearables emphasize and most people misread. Start with the HRV guide — it explains the metric nearly every device surfaces, regardless of brand.