Wilks Coefficient Calculator
Calculate the Wilks coefficient for powerlifting strength comparison. Enter body weight, total lifted, and gender for instant Wilks score, weight curve charts, and strength classification.
About This Calculator
The Wilks Coefficient Calculator helps powerlifters compare their strength performance across different body weight classes and genders. Developed by Robert Wilks of Powerlifting Australia, the Wilks formula normalizes the total weight lifted (squat + bench press + deadlift) by accounting for the lifter's body weight, creating an objective measure of relative strength.
The calculation uses a fifth-degree polynomial formula with different coefficients for male and female lifters: Wilks = (total lifted weight × 500) / (a + bx + cx² + dx³ + ex⁴ + fx⁵), where x is body weight in kilograms. The original formula was introduced in the 1990s and became the standard for strength comparison in powerlifting competitions worldwide. In 2020, an updated version (Wilks 2020) was released using a 600 multiplier with revised coefficients, but the original 500-multiplier formula remains widely used by many federations and online platforms.
The Wilks coefficient is particularly useful for determining overall champions across different weight categories in competitions, team events, and handicap contests. While the International Powerlifting Federation (IPF) transitioned to the IPF GL points system in 2019, the Wilks formula continues to be the most recognized and commonly used coefficient in the powerlifting community, supported by scientific validation studies published in Medicine & Science in Sports & Exercise.
Regional Notes
Global: The Wilks coefficient is used internationally by powerlifting federations and gym enthusiasts. The formula is the same worldwide, using metric measurements (kg). Lifters using pounds can convert by dividing their weight by 2.2046.
United States: Many US-based powerlifting federations including USAPL, USPA, and NASA Powerlifting use the Wilks formula or offer Wilks-based best lifter awards. Lifters training in pounds should convert to kilograms for accurate results.
United Kingdom: British powerlifting federations such as British Powerlifting and GBPF use the Wilks formula for classification standards and best lifter determinations. The formula supports both raw and equipped lifting comparisons.
India: The Indian Powerlifting Federation and state-level competitions use the Wilks formula for overall championship determinations. Growing interest in powerlifting has made the Wilks coefficient increasingly relevant for Indian lifters comparing their performance nationally and internationally.
Frequently Asked Questions
What is the Wilks coefficient?
The Wilks coefficient is a mathematical formula used in powerlifting to compare the strength of lifters across different body weight classes and genders. Developed by Robert Wilks of Powerlifting Australia, it normalizes the total weight lifted by accounting for body weight differences, allowing fair comparison between lighter and heavier lifters.
How is the Wilks coefficient calculated?
The Wilks coefficient is calculated using the formula: Wilks = (total weight lifted in kg × 500) / (a + bx + cx² + dx³ + ex⁴ + fx⁵), where x is the lifter's body weight in kg and the coefficients a through f differ for males and females. This produces a score that represents the lifter's performance normalized across all weight classes.
What is a good Wilks coefficient score?
Wilks scores vary widely by experience level. For male lifters, a score above 300 is considered elite, 250-300 is advanced, 200-250 is intermediate, and below 200 is novice. For female lifters, a score above 350 is elite, 300-350 is advanced, 250-300 is intermediate, and below 250 is novice. These ranges depend on the weight class and federation.
Does powerlifting still use the Wilks coefficient?
The International Powerlifting Federation (IPF) replaced the Wilks coefficient with the IPF GL points formula at the end of 2018, but many other federations worldwide still use the Wilks formula. It remains the most widely recognized and used coefficient in powerlifting for comparing lifters across bodyweight categories.
What is the difference between the original and 2020 Wilks formula?
The original Wilks formula uses a multiplier of 500 and the original coefficients from Robert Wilks. In March 2020, Powerlifting Australia released an updated version (Wilks 2020) that uses a multiplier of 600 with new coefficients to better balance extreme bodyweight classes and align male and female performances. This calculator uses the original Wilks formula.
What three lifts make up the total in Wilks calculation?
The Wilks coefficient is calculated using the lifter's competition total, which is the sum of their best successful attempt in the squat, bench press, and deadlift. In powerlifting competitions, each lifter gets three attempts per lift, and the heaviest successful lift from each is added together to form the total.
How do I use the Wilks calculator?
Enter your body weight in kilograms, the total weight you lifted (sum of squat, bench press, and deadlift in kg), and select your gender. Click Calculate to instantly see your Wilks coefficient score. The chart shows your score alongside a weight curve graph that visualizes how the coefficient varies at different body weights.
What alternatives exist to the Wilks coefficient?
Several alternative coefficients exist for comparing powerlifting strength: IPF GL points (used by IPF since 2019), Glossbrenner coefficient (WPC), Reshel coefficient (GPC, GPA), Schwartz/Malone formula, and NASA coefficient. For weightlifting, the Sinclair coefficient and Robi Points serve a similar purpose. Each uses different mathematical approaches to normalize strength across body weights.