Recovery Time Estimate Calculator

Work out recovery time estimate instantly with clear inputs, formula shown and shareable results.

About Recovery Time Estimate Calculator

Recovery time scales with session load and is lengthened by poor sleep and advancing age. A 90 minute session at RPE 8 gives a baseline near 22 hours, extended by about 4% for each year past 30 and by up to 45% on under six hours of sleep. Treat the figure as guidance for spacing hard sessions rather than a precise physiological readout.

Formulas

Baseline recovery

hours = RPE x minutes / 100 x 3

Adjustments

x sleep factor (0.9 to 1.45) x age factor (1 + 0.008 per year over 30)

Worked example

With the default values below, Recovery Time Estimate Calculator returns Estimated Recovery Time of 22.5. Change any input above and every figure here is recalculated in your browser.

Inputs used

Session RPEaccepts 1–10: 8
Session durationminimum 0 min: 90 min
Sleep last nightaccepts 0–14 h: 7 h
Ageaccepts 12–90 years: 35 years

Results

Estimated Recovery Time: 22.5 h
Days Until The Next Hard Session: 0.94 days
Baseline Recovery Before Adjustments: 21.6 h
Sleep Adjustment Factor: 1.00

Step by step

1Values used
2Baseline recovery
3Adjustments
4Estimated Recovery Time= 22.5 h
5Days Until The Next Hard Session= 0.94 days
6Baseline Recovery Before Adjustments= 21.6 h
7Sleep Adjustment Factor= 1.00

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
This is an estimate from population-average equations, not a medical or diagnostic assessment. Individual results vary with genetics, training history and technique. Seek advice from a qualified coach or clinician before making significant changes to training.
This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

This is an estimate from population-average equations, not a medical or diagnostic assessment. Individual results vary with genetics, training history and technique. Seek advice from a qualified coach or clinician before making significant changes to training.

Frequently Asked Questions

Why does sleep matter so much?

Growth hormone release, glycogen resynthesis and central nervous recovery are all sleep-dependent. Short sleep is the single largest modifiable recovery factor.

Can I train while still recovering?

Yes - easy aerobic work often speeds recovery. What this estimates is the gap before the next genuinely hard session.