When should I use the Mayhew formula?

The Mayhew formula was developed specifically for the bench press and is more accurate for higher rep ranges of 8-20 reps compared to Epley and Brzycki.

What is the mathematical basis of Mayhew formula?

It uses an exponential decay curve: 1RM = (100 x weight) / (52.2 + 41.9 x e^(-0.055 x reps)). The exponential term accounts for the non-linear fatigue relationship at high repetition counts.

Is Mayhew formula sport-specific?

The Mayhew formula was validated on bench press specifically. For squats, deadlifts, and other movements, Epley or Brzycki may be more appropriate, though the difference is small.

1-Rep Max Mayhew Formula Calculator

Estimate 1 rep max using the Mayhew exponential formula: 1RM = (100 x weight) / (52.2 + 41.9 x e^(-0.055 x reps)).

Use the full interactive calculator below, or

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Frequently Asked Questions

When should I use the Mayhew formula?

What is the mathematical basis of Mayhew formula?

Is Mayhew formula sport-specific?