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The Wilks coefficient normalises a powerlifting total for body weight using a fifth-order polynomial, so lifters across weight classes can be ranked. A 500 kg total at 90 kg gives a coefficient near 0.594 and a Wilks score around 297. Scores above 400 are advanced and above 500 are elite; the formula was the international standard until IPF GL points replaced it.
Wilks coefficient
coeff = 500 / (a + bx + cx^2 + dx^3 + ex^4 + fx^5), x = body weight
Wilks score
score = total x coefficient
This is an estimate from population-average equations, not a medical or diagnostic assessment. Individual results vary with genetics, training history and technique. Seek advice from a qualified coach or clinician before making significant changes to training.
The polynomial was fitted to record data from the 1990s, and critics showed it slightly favours middleweight men and heavier women, which prompted the newer formulas.
The IPF moved to GL points in 2020, but Wilks remains widely used in gyms and by other federations.