Muscle Recovery Calculator
Trained legs yesterday and wondering when to hit them again? Estimate how long a muscle needs to recover, based on how hard you trained it.
Your details
Your results
Enter how many sets you did for the muscle.
Recovery time
hours
- Train it hard again
- Time left
You don't have to wait to train at all. Other muscles are fine to train, and light work for this one is fine too. The window is for training the same muscle hard again at full performance.
Still clearly sore, or your weights feel heavy in the warm-up? Give it another day, or keep the session light.
How to use it
- Pick how hard your sets were, from easy to failure.
- Enter how many sets you did for the muscle, and whether the exercise was new or much more than you're used to.
- Add the hours since your session to see how much recovery time is left. Optional.
How it's calculated
Where the numbers come from. Researchers had trained men do bench presses and squats, either to failure or stopping well short of it, and tracked jump height, bar speed and blood markers for up to 72 hours:
- Stopping at about half the possible reps (for example 4 reps with a weight you could lift 8 times), performance was back within 6 to 24 hours (González-Badillo et al. 2016; Pareja-Blanco et al. 2017).
- Sets to failure kept performance down for up to 48 hours and recovered more slowly through 72 hours (Morán-Navarro et al. 2017).
The windows.
| How hard | Recovery |
|---|---|
| 4 or more reps left | 6–24 h |
| 2–3 reps left | 24–48 h |
| To failure or 1 rep left | 48–72 h |
The middle row wasn’t measured directly; it sits between the two that were.
Adjustments. More than about 11 sets for one muscle moves the estimate to the slower half of the range, since higher volume slows recovery. A new exercise, or much more than you’re used to, extends the window to at least 72 hours: soreness from unaccustomed work peaks 24 to 72 hours later (Cheung et al. 2003).
Limits. These studies used young trained men and two exercises. Sleep, food, age and stress all change recovery. Use the estimate as a starting point and adjust to how you perform.
Sources
- Morán-Navarro, R., Pérez, C. E., Mora-Rodríguez, R., et al. (2017). Time course of recovery following resistance training leading or not to failure. European Journal of Applied Physiology, 117(12), 2387–2399.
- González-Badillo, J. J., Rodríguez-Rosell, D., Sánchez-Medina, L., et al. (2016). Short-term recovery following resistance exercise leading or not to failure. International Journal of Sports Medicine, 37(4).
- Pareja-Blanco, F., Rodríguez-Rosell, D., Sánchez-Medina, L., et al. (2017). Acute and delayed response to resistance exercise leading or not leading to muscle failure. Clinical Physiology and Functional Imaging, 37(6), 630–639.
- Cheung, K., Hume, P., & Maxwell, L. (2003). Delayed onset muscle soreness: treatment strategies and performance factors. Sports Medicine, 33(2), 145–164.
Questions
How long do muscles take to recover after a workout?
Usually somewhere between 6 hours and 3 days. Easy sets stopped well short of failure recover within a day. Sets to failure can keep performance down for 48 hours or more.
Should I wait until I'm not sore anymore?
Not necessarily. Soreness doesn't line up neatly with recovery, and light training on a sore muscle is fine. If you're very sore or your warm-up weights feel heavy, keep the session easy.
Does training to failure slow recovery?
Yes. In studies comparing the same exercises, sets taken to failure took clearly longer to recover from than sets stopped at about half the possible reps.
Can I train the same muscle two days in a row?
If the first session was easy, yes. After hard sets, give that muscle a day or two before training it hard again, or alternate muscles on back-to-back days.
Updated November 9, 2026.