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Glossary Health & Fitness

One-rep max (1RM)

A one-rep max is the heaviest weight you can lift for a single repetition; it is often estimated from a lighter set of several reps.

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In more detail

The Epley formula is weight × (1 + reps / 30): 100 kg for 5 reps is 116.7 kg; Brzycki gives 112.5 kg. Estimates get less reliable above about 10 reps.

Try these tools

One Rep Max Calculator

Estimate your one-rep max (1RM) from a submaximal set using the Epley and Brzycki formulas, plus a training percentage table.

See also

  • Glossary VO₂ max
    VO₂ max is the maximum rate at which the body can use oxygen during hard exercise.
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