Recovery Score Explained: What Recovery and Readiness Scores Measure
Recovery and readiness are the same idea under different brand names. Both are a single number blended mostly from your HRV, resting heart rate, and sleep, metrics you can already see on their own.
This page covers what a recovery or readiness score actually measures, why recovery and readiness are the same metric under different brand names, an interactive breakdown of what goes into the score, why the score is mostly a repackaging of your HRV and resting heart rate, why scores can't be compared across devices, and what the evidence supports.
Your watch says your recovery is 38% this morning, or your ring says readiness is 64. Before you reorganize your day around it, here's what that number actually is: a recovery score is not a new measurement, it's a blend of metrics you already track, chiefly your overnight HRV, your resting heart rate, and your sleep, with recent training strain mixed in. The device weights those ingredients with a private formula and hands you one figure. Understand the ingredients and the score stops being mysterious.
The tool below breaks down what typically goes into the score so you can see which inputs are driving yours. The sections explain how recovery and readiness relate, why the number can disagree with how you feel, and what the evidence does and doesn't support.
Recovery scores are a blend, not a measurement. Tell us how each input looks for you this morning and we'll show how it typically pushes the score, so you can see what's really driving the number. This is illustrative, not your device's exact formula.
Set each input to see how it typically shapes a recovery score.
Based on the published role of HRV, resting heart rate, and sleep in autonomic recovery monitoring (e.g. Plews et al. 2013; Buchheit 2014). Device formulas are proprietary and vary; weightings here are illustrative.
What a recovery score actually is
A recovery score, or readiness score, is your device's single-number answer to "how prepared is your body today?" To build it, the device blends several overnight and recent measurements: your heart rate variability, your resting heart rate, your sleep, and how much training strain you've taken on recently. It weights those with a private formula and hands you a percentage or a number out of 100. The key thing to hold onto is that none of those ingredients is new. They are metrics you can already see individually. The score just combines them.
Recovery and readiness are the same thing
People get confused because different brands use different words for the same idea. They are members of one family.
| Device | What it's called | Main inputs |
|---|---|---|
| Whoop | Recovery | HRV, resting HR, sleep, prior strain |
| Oura | Readiness | HRV, resting HR, body temp, sleep, activity |
| Garmin | Training Readiness | HRV, sleep, recovery time, recent load |
| Fitbit | Daily Readiness | HRV, resting HR, recent activity, sleep |
Brand names and the inputs each maker says it uses. Exact formulas and weightings are proprietary and not fully published. The common thread across all of them is HRV, resting heart rate, and sleep.
There is one small honest distinction. "Recovery" leans slightly backward, how recovered you are from past strain; "readiness" leans slightly forward, how prepared you are for today. But the inputs and the output are nearly identical, so in practice they answer the same question. If you switch from a Whoop to an Oura, you are not getting a different kind of metric, just a different label and formula.
HRV usually does most of the work
Across these scores, the single input that moves the number most is usually your overnight HRV, followed by resting heart rate, with sleep and strain filling in.
In most recovery and readiness formulas, overnight HRV carries the heaviest weight, with resting heart rate close behind.1 Both reflect how your autonomic nervous system settled overnight. This is why your score is essentially a repackaging of two numbers you can already read directly, dressed up as a single verdict.
That has a practical consequence worth understanding: because the score is driven by overnight physiology, it can disagree with how you feel. You can wake up feeling fine and get a low score because your HRV dropped and your resting heart rate rose overnight, signals you don't consciously feel. The reverse happens too. The score isn't broken when this happens; it's reporting something your subjective sense missed, or weighting overnight signals you'd have shrugged off.
A recovery score isn't a new fact about your body. It's your HRV and resting heart rate, wearing a costume and calling itself a verdict.
Kate Maren, Editor
Why the score can be low when you feel great: the things that lower overnight HRV and raise resting heart rate, late alcohol, a big meal close to bed, a warm room, stress, or an illness you haven't noticed yet, all happen below conscious awareness. The score catches them. That's its main value, and also why it sometimes feels wrong.
Why you can't compare scores across devices
Like sleep scores, recovery and readiness scores are proprietary and calibrated to you. Each device builds your personal baseline over time and scores you against it, using a formula it doesn't fully disclose. So a 70 on your device is not the same as a 70 on someone else's, or on a different brand. The score is built to track you against your own recent baseline, not to rank you against other people. Comparing your recovery to a training partner's tells you almost nothing; comparing this week to last week on your own device tells you something real.
What the data doesn't capture
A recovery score blends real signals, but the blend itself isn't a validated medical measurement, and the formula is hidden. The individual inputs, HRV and resting heart rate, have genuine research behind them as markers of autonomic state.2 The proprietary score wrapped around them does not have the same independent validation. Read it as a convenient summary, not a diagnosis.
Two honest limits. First, because the formula is private and varies by device, the score is the least transparent thing your wearable shows; you can trust the inputs more than the output. Second, recovery scores are designed for and validated mostly around training and athletic readiness, not health screening, so a low score signals athletic readiness, not a health verdict. What the evidence supports is using HRV and resting heart rate trends as real signals of how your body is coping. What it does not support is treating a proprietary daily percentage as a precise instruction.
If you came here because your recovery or readiness score confused you, the most useful reading is this: look at what's driving it, your HRV and resting heart rate against your own baseline, plus your sleep, treat it as a summary of those rather than a separate truth, and watch your own trend over weeks. That tells you what the score can honestly offer, without handing a hidden formula authority over your day.
Common questions
What is the difference between recovery and readiness scores?
They're the same family of metric with different brand names. Whoop calls it Recovery, Oura and Garmin and Fitbit call it Readiness. Both blend overnight HRV, resting heart rate, sleep, and recent strain. Recovery leans slightly toward recovery from past strain, readiness toward preparedness for the day, but the inputs and output are nearly identical.
What does a recovery score actually measure?
It's a single number blended from several inputs, chiefly overnight HRV, resting heart rate, sleep, and recent strain, with HRV usually weighted most. The exact formula is proprietary and differs by device, so the score is really a repackaging of metrics you can already see individually.
Why is my recovery score low when I feel fine?
Because it's driven mostly by overnight HRV and resting heart rate, which respond to things you may not feel: alcohol, a late meal, a warm room, a coming illness, or stress. If your HRV was down and resting heart rate up overnight, the score follows, even on a day you feel okay.
Can I compare my recovery score to someone else's?
Not meaningfully. Each device uses its own private formula and a baseline calibrated to you, so a 70 on your device isn't the same as a 70 on another person's or another brand. The score tracks you against your own baseline over time, not against other people.
References
- Plews DJ, Laursen PB, Stanley J, Kilding AE, Buchheit M (2013). Training adaptation and heart rate variability in elite endurance athletes: opening the door to effective monitoring. doi:10.1007/s40279-013-0071-8
- Buchheit M (2014). Monitoring training status with HR measures: do all roads lead to Rome? doi:10.3389/fphys.2014.00073
How HRV, resting heart rate, and sleep each move a recovery score is covered, with its own sources, in the linked article below.