Wilks · DOTS · IPF GL Calculator

What Are Powerlifting Coefficients? (Wilks, DOTS & IPF GL Explained)

Powerlifting coefficients solve a fundamental fairness problem: how do you compare a 52 kg lifter with a 140 kg lifter when bodyweight dramatically affects how much weight can be lifted? A 300 kg raw total means something very different depending on the athlete's weight class. Coefficients apply a mathematical formula to normalize the total lifted against bodyweight, producing a single comparable number.

There are now three major systems in active use — Wilks, DOTS, and IPF GL — each with different mathematical approaches, adoption histories, and communities of use. This calculator computes all three simultaneously so you can understand your performance through each lens.

Wilks Score — The Original Standard (Revised 2020)

The Wilks coefficient was created by Robert Wilks and published in the early 1990s. For decades it was the universal standard for powerlifting comparison, used worldwide by every federation and training community. The original formula used a 5th-degree polynomial fitted to competitive data, with separate coefficients for men and women.

In 2020, Robert Wilks published a significantly revised version (Wilks 2020 or "Wilks 2") that corrected mathematical errors in the original formula that had caused it to slightly favor lighter and heavier weight classes at the expense of middle weight classes. This calculator uses the 2020 revised Wilks formula. A Wilks score above 400 is considered advanced/elite in raw powerlifting; above 500 is world-class territory.

Formula: Wilks = (600 / (a₀ + a₁w + a₂w² + a₃w³ + a₄w⁴ + a₅w⁵)) × Total, where the aₙ coefficients differ for men and women, and w = bodyweight in kg.

DOTS Coefficient — The IPF's Current Standard

The DOTS (Degree of Theoretical Strength) formula was developed by Tim Leidgens and adopted by the International Powerlifting Federation (IPF) in 2019 to replace the original Wilks formula. DOTS uses a 5th-degree polynomial differently structured from Wilks, and is generally considered more mathematically accurate across the full weight spectrum — particularly for very light lifters (below 50 kg) and very heavy lifters (above 120 kg) where the original Wilks formula had known distortions.

DOTS values are broadly similar to Wilks scores in practical terms — a 400 DOTS score is roughly equivalent in competitive meaning to a 400 Wilks score. However, for lifters at extreme weight classes, DOTS may produce a meaningfully different assessment.

IPF Good Lift Points (GL) — The Competition System

IPF GL Points were introduced alongside DOTS in 2019 specifically for use in IPF-sanctioned international and national competitions. Unlike Wilks and DOTS, which produce an abstract coefficient multiplier, GL Points are calibrated so that a world-record-level performance in any weight class scores approximately 100 points. This makes them the most interpretable system: a score of 80 means you're at 80% of world-record level for your weight class.

GL Points are what you'll see reported in IPF competition results worldwide, including at the World Classic Powerlifting Championships. If you compete in IPF-affiliated federations (USAPL in the USA, British Powerlifting in the UK, etc.), GL Points are the official metric for qualification standards and all-time rankings.

Which Coefficient Should You Use?

For general training and comparison in non-IPF communities, Wilks remains the most widely understood — ask any experienced powerlifter their score and they'll usually know it. For competitive purposes within IPF-affiliated federations, DOTS and GL Points are the official metrics. For historical comparison or cross-federation discussion, all three are useful context. This is why we show all three simultaneously.