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Rest Interval Recommendation Calculator

See how long to rest between sets for your goal.

How it is calculated

There is no formula here: the tool looks up a fixed rest time for the training goal you pick and shows it in seconds and in minutes (minutes = seconds / 60). The values it uses are strength 180 s (3.0 min), power 210 s (3.5 min), hypertrophy 90 s (1.5 min) and endurance 60–120 s (1.0–2.0 min, per ACSM 2009). It returns one single figure per goal, except endurance, which gives the 1–2 minute range, and it does not depend on load, reps, exercise or your fitness level. If no goal is given it falls back to hypertrophy. Use the figure as a starting point between working sets and lengthen or shorten it based on how recovered you feel and how heavy the set was.

Worked example

You are training for strength and choose that goal. The lookup gives 180 seconds. Converting to minutes: 180 / 60 = 3.0. Result: rest 180 s, or 3.0 min, between sets. Choosing hypertrophy instead would give 90 s (1.5 min), and endurance 60–120 s (1.0–2.0 min).

Try this example →

Common mistakes

  • Choosing the goal by exercise rather than by the set you are about to do. A heavy set of 3 reps on any lift is a strength set, while a light set of 15 is endurance.
  • Applying one rest time to a whole session that mixes heavy and light work. Pick the goal per exercise.
  • Reading the minutes line as 1.5 "minutes and 50 seconds". The decimal is a fraction, so 1.5 min is 90 seconds.
  • Treating the number as a strict rule. Heavy compound lifts, supersets and warm-up sets all call for different rests, and the tool applies only the goal.
  • Timing from the end of the previous set to the start of the next, but also counting setup time. The figure is meant as the pure rest.

Sources

About this calculator

How long to rest between sets is not one-size-fits-all — it depends heavily on the training goal, because different rest lengths favor different physiological adaptations. Strength- and power-focused training (heavy, low-rep sets) typically calls for longer rest of around 3-5 minutes to allow near-full recovery of the phosphagen energy system, hypertrophy-focused training (moderate reps) usually uses shorter 60-90 second rests that maintain metabolic stress, and muscular-endurance work (high reps, lighter loads) typically uses 1-2 minute rests for 15-20+ repetition sets, and under a minute for 10-15 repetitions, guidelines broadly consistent with NSCA position statements on resistance training.

Strength coaches and lifters use these rest-interval guidelines to structure a session so the rest periods actually match the intended training effect, rather than defaulting to the same rest length regardless of whether the session is aimed at a 1RM attempt or a high-rep endurance circuit. Getting the rest interval wrong for the goal — too short for a heavy strength set, too long for a metabolic hypertrophy circuit — undercuts the adaptation the session was designed to produce.

Each goal maps to one rest time: 3 minutes for strength, 3.5 for power, 90 seconds for hypertrophy and 1 to 2 minutes for muscular endurance (ACSM 2009).

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