Training Recovery Calculator

How does the training recovery calculator produce its number?

It multiplies four fixed factors: a base window for the muscle group, then multipliers for intensity, volume and experience. The base windows are 72 hours for legs and back, 48 for chest and shoulders, 36 for arms and 24 for core. The product is rounded to the nearest half hour. These are rule-of-thumb values built into the tool, not outputs of a physiological model.

What are the multipliers?

Intensity: light 0.7, moderate 1.0, hard 1.3, maximum 1.6. Volume: low 0.8, medium 1.0, high 1.2, very high 1.4. Experience: beginner 1.3, intermediate 1.0, advanced 0.8. They compound, so a beginner doing a maximal, very-high-volume back session gets 72 × 1.6 × 1.4 × 1.3 = 209.5 hours.

Is the result a scientifically measured recovery time?

No. The window is a planning heuristic, and the tool cannot measure soreness, sleep, stress, nutrition, age or the exercises you chose. Two people with identical inputs can recover very differently. Use the figure as a starting point for scheduling and let how you feel, and how your performance trends, override it.

Do the RPE and volume labels need to be exact?

They are bands. Light covers RPE 5–6, moderate RPE 7–8, hard RPE 9 and maximum RPE 10, and the volume options are sets per muscle in that session (1–3, 4–6, 7–10 and 10+). If you are between two options, run both and treat the pair as your range.

Why can the result be longer than a week?

Because the multipliers stack with no upper cap. A beginner doing maximal, very-high-volume work on legs or back can see more than eight days. Such a combination is rare in practice, and a result that long suggests the inputs are more extreme than a sensible session, so consider lowering the volume or effort choices.

Does one muscle group result apply to the whole body?

It applies to the one primary muscle group you select. A full-body session involves several groups with different base windows, so run the calculator for the group that was hit hardest, or for each group you trained, and plan around the longest result.

What does "Next Training Recommendation" mean?

It repeats the total hours, rounded to a whole number, as the time before training that muscle group again. It is not a rule against training other muscles or doing light movement in the meantime. If you have pain, swelling or an injury, seek guidance from a qualified clinician instead of relying on this estimate.