Workout Duration Calculator

Optimal strength training duration is typically 45–90 minutes. Sessions shorter than 45 min may be insufficient for full muscle stimulation; longer than 90 min leads to excessive fatigue and elevated cortisol. Research suggests 60 minutes is the sweet spot for most gym-goers.

Training volume is the total number of reps performed in a session: exercises × sets × reps. It is a key indicator of the training stimulus. Research shows 10–20 sets per muscle group per week is optimal for hypertrophy. Too little = no progress; too much = overtraining.

It depends on your goal: strength and power — 2–5 min (120–300 s), full ATP recovery; hypertrophy — 60–120 s, moderate metabolic fatigue; muscular endurance — 30–60 s, high fatigue. Longer rest between exercises (2–3 min) allows transition to a new muscle group.

For hypertrophy: 3–5 sets per exercise, giving 10–20 sets per muscle group per week. For maximal strength: 3–6 sets with low reps (1–5) and long rests. Beginners can start with 2–3 sets and progressively increase volume.

TUT is the total time a muscle is under tension during a set. The calculator uses a simplified model — set duration in seconds. A typical set lasts 20–60 s (e.g. 10 reps × 2 s eccentric + 1 s isometric + 2 s concentric = 50 s). Longer TUT promotes hypertrophy.

With 60 minutes: 6–8 exercises × 3–4 sets × 8–12 reps with 60–90 s rest. Use the calculator to fine-tune. Time-saving techniques: supersets (alternating exercises), circuits, shorter rest periods. Avoid long conversations and distractions.

1–5 reps: mainly strength and power (85–100% 1RM); 6–12 reps: hypertrophy zone, best for muscle growth (70–85% 1RM); 13–20+ reps: muscular endurance (50–70% 1RM). Research shows hypertrophy occurs across a wide rep range as long as sets are taken close to muscular failure.

Yes — rest between exercises should be longer (90–180 s) than between sets of the same exercise (60–120 s). Moving to a new exercise often means a different muscle group or movement pattern, requiring time to reset focus and prepare the body. In antagonist supersets, rest can be shorter.

Total time = work time + rest time. Work time = total sets × set time. Rest time = (total sets − 1) × rest between sets + (exercises − 1) × rest between exercises. Result is in minutes, rounded to one decimal. Warm-up and cool-down not included.

Increase volume gradually (progressive overload) when: you no longer feel DOMS after workouts; strength or physique progress has stalled for 2–4 weeks; you feel well-recovered before each session. Do not increase volume at the first signs of overtraining: chronic fatigue, declining performance, sleep disturbances.