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Percent of 1RM Calculator

Get the load for any %1RM.

How it is calculated

The tool gives the working load for a chosen intensity: load = 1RM × p / 100. 1RM is your one-rep max (the heaviest weight you can lift once, in any unit) and p is the percentage of it you want to train at, entered as a plain number, so 75 means 75 %. The answer is in the same unit as the 1RM, rounded to two decimals. Both values must be above zero, and the percentage is accepted up to 120; a higher value gives no result. The tool does not round to the plates you own, so you may need to adjust to the nearest loadable weight.

Worked example

Your one-rep max is 140 kg and the programme calls for 82.5 % of it. Divide the percentage by 100: 82.5 / 100 = 0.825. Multiply: 140 × 0.825 = 115.5. The calculator shows a load of 115.50 kg. In practice you would round to the nearest weight your plates can make.

Try this example →

Common mistakes

  • Typing the percentage as a fraction (0.8 for 80 %). The field expects 80, so 0.8 would return under 1 % of the max.
  • Using an estimated 1RM from a very high-rep set. The load will be only as good as that estimate.
  • Applying percentages of one lift to another. Squat percentages should use the squat 1RM.
  • Forgetting to round to loadable plates, then finding the bar cannot be loaded to the exact figure.
  • Entering the target weight as the 1RM, which reverses the calculation.

About this calculator

Training programs commonly prescribe loads as a percentage of one-rep max (%1RM) — the heaviest weight a lifter can lift for a single complete repetition — because it standardizes intensity across lifters of different strength levels; a percentage-based prescription scales automatically to each individual's actual capability, unlike a fixed weight.

Strength coaches and periodization models, such as linear or undulating periodization, use %1RM ranges to target specific training adaptations: roughly 85 to 100% 1RM for maximal strength and low-rep power work, 67 to 85% for hypertrophy-focused moderate-rep training, and below 67% for muscular endurance and technique work, often cross-referenced against the Epley or Brzycki rep-max estimation formulas when a true 1RM hasn't been tested directly.

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