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Stress Recovery Time Calculator

Enter your training stress score and fitness level to estimate recovery time.

How it is calculated

The tool applies a one-line rule of thumb: recovery hours = TSS × factor, then days = hours ÷ 24. TSS is the training stress score of the session, taken from your cycling or running software. The factor depends on the fitness level you choose: 1.5 for beginner, 1.0 for intermediate and 0.7 for advanced. Any other level is treated as intermediate (1.0). The score must be greater than zero. Hours are shown to one decimal and days to two. This is a planning heuristic, not a physiological measurement: it ignores sleep, nutrition, age, illness and what the next session needs, and it assumes a TSS of 100 means 100 hours for an intermediate athlete, which is long, so treat it as a relative guide.

Worked example

An advanced athlete finishes a session with a TSS of 120. The advanced factor is 0.7. Recovery hours: 120 × 0.7 = 84.0 hours. In days: 84 ÷ 24 = 3.50. The tool shows 84.0 hours, 3.50 days and a factor of 0.7×. The same session for a beginner would be 120 × 1.5 = 180 hours, or 7.5 days.

Try this example →

Common mistakes

  • Entering the session duration in minutes or the heart-rate average instead of the stress score. The field expects a TSS-style number that already combines duration and intensity.
  • Choosing the advanced level to get a shorter wait. The factor changes the result a lot (0.7 against 1.5), so pick the level that honestly describes your training history.
  • Reading the hours as a rest order. A recovery of 84 hours does not mean doing nothing, because easy aerobic sessions are normally fine while fatigue clears.
  • Adding up the recovery of several sessions linearly. The tool handles one score at a time, and back-to-back days accumulate in ways it does not model.
  • Expecting a TSS from a different system to match. Scores from other platforms are scaled differently, so use the same source consistently.

About this calculator

Endurance coaches quantify a workout's demand with a training stress score (TSS)-style number that combines duration and intensity into a single figure, higher scores meaning a harder session. Recovery from that stress isn't purely about the score, though — it also depends on the athlete's fitness level, since a well-trained body clears fatigue faster than a deconditioned one.

This calculator applies a simple heuristic — recovery hours equal the stress score multiplied by a fitness-level factor — to turn those two inputs into a rough estimate of how long before the next hard effort makes sense. It's meant as a training-planning guide for athletes and coaches sequencing workouts in a week, not a physiological or medical measurement, since real recovery also depends on sleep, nutrition, and individual variation that a single formula can't capture.

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Comments (1)

  • Editorial team

    Use the output to rank sessions against each other rather than to schedule rest. A score of 60 gives 42.0 hours for the advanced setting and 90.0 hours for the beginner one, a gap of nearly two days from the same workout. The rule takes the score in hours at a ratio of one to one, which runs long for easy days, so let sleep, soreness and your next key session overrule it. What score range do your hard days usually land in?

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