Wilks Score Calculator

The Wilks coefficient uses a 5th-degree polynomial to adjust raw totals based on bodyweight, creating comparable scores across weight classes. Developed by Robert Wilks in 1994 using regression analysis of 5,000 ranked powerlifters, the formula generates a multiplier that increases as bodyweight decreases. This theoretically eliminates the absolute strength advantage of heavier athletes.

Research by Vanderburgh found Wilks has no significant bias for bench press but favors lighter women in squats and disadvantages heavier men in deadlift. Studies confirmed it favors medium-weight lifters over both lightweights and super-heavyweights. Additionally, Wilks was created before the raw/equipped distinction existed, so it applies uniformly to both despite their different strength curves.

The IPF transitioned away from Wilks in 2019 due to documented biases and the formula's age. The original 1994 coefficients were based on 5,000 athletes, while newer formulas use 20,000+ performances with modern equipment and training methods. The IPF also needed separate coefficients for raw versus equipped lifting. Wilks was ultimately replaced by IPF GL Points, which performed better in evaluations.

General benchmarks: under 300 is beginner/intermediate, 300-400 is advanced (competitive at local meets), 400-500 is elite (competitive at national level), and 500+ is world-class. However, these thresholds vary by federation and era. Research shows median Wilks scores at IPF World Championships typically range from 450-550. For recreational lifters, reaching 300 Wilks represents a significant milestone.

Yes, the formula uses completely different polynomial coefficients for each gender, recognizing biological differences in strength potential relative to bodyweight. Female coefficients produce higher multipliers at equivalent bodyweights, normalizing the absolute strength gap. Research shows the female formula may slightly favor lighter women in squats while being neutral for bench press.

For personal progress tracking, Wilks remains valuable despite being replaced by IPF GL for competitions. Its main advantage is decades of historical data for comparison - if you've tracked Wilks scores over years, switching formulas loses that baseline. Wilks is also more widely recognized in the powerlifting community. However, if you're starting fresh or compete in IPF-affiliated federations, learning DOTS or IPF GL may be more relevant. For pure self-comparison over time, any consistent formula works since you're measuring relative improvement.