Powerlifting Scoring Systems: Wilks vs DOTS vs IPF GL Explained

When a 59 kg lifter totals 450 kg and a 120 kg lifter totals 600 kg, who is stronger relative to body weight? That question is what powerlifting scoring systems try to answer. Wilks, DOTS, and IPF GL each provide a mathematical coefficient that scales lifted totals to produce a single number comparable across weight classes. Our Wilks score calculator and IPF GL points calculator run the numbers — this post explains the formulas and their differences.

Why Body Weight Scaling Is Needed

Heavier people lift more weight in absolute terms. The relationship between body weight and maximum strength is not linear — it follows something closer to a power law. A lifter who is twice as heavy will not lift twice as much. If you scaled purely by body weight, lighter lifters would be systematically disadvantaged. A good coefficient formula should make the average lift at each body weight class score roughly equally, so that the best lifter at 66 kg and the best lifter at 120 kg could win the same meet on a level playing field.

The Wilks Formula (1998)

Developed by Robert Wilks for Powerlifting Australia in the late 1990s, the Wilks formula was the international standard for decades and is still used by many federations and for historical comparison.

How It Works

The Wilks coefficient is calculated from a 5th-degree polynomial regression fitted to competitive powerlifting data, separately for men and women. The coefficient is multiplied by the total lifted (in kg) to produce the Wilks score.

Wilks Score = Total (kg) × Coefficient(body weight)

The coefficients decrease as body weight increases (heavier lifters need a higher total to achieve the same score), and the curve was fitted to equalize scoring across weight classes at the elite level.

Strengths

• Long track record — enables historical comparison going back to the late 1990s
• Universally recognized — most lifters know what a "600 Wilks" or "500 Wilks" means
• Still used by many national and local federations

Limitations

• The original polynomial was fitted to data from a specific era of powerlifting (late 1990s). As average elite totals increased — partly due to better training methodology, and partly due to changes in equipment — the curve became less accurate at the extremes (very light and very heavy weight classes)
• The updated 2020 Wilks formula addressed some of these issues; many calculators have not updated to use it
• Relatively disadvantages lighter lifters at the very top of the weight class distribution

The DOTS Formula (2019)

DOTS (Dynamic Objective Total Score) was developed by Powerlifting Australia and adopted by USA Powerlifting (USAPL) and several other federations to replace the original Wilks. It uses a different mathematical approach designed to more accurately reflect the current distribution of elite competitive totals.

How It Works

DOTS uses a 4th-degree polynomial fitted to current competition data (2017-2019 era totals from major competitions). Like Wilks, it produces a coefficient multiplied by the total.

DOTS Score = Total (kg) × DOTS Coefficient(body weight)

The DOTS formula is fitted separately for men and women, and also produces separate coefficients for equipped (with gear) and raw (no gear) powerlifting — a distinction Wilks did not originally make.

Strengths

• More accurate at equalizing performance across weight classes with modern competition data
• Explicit raw/equipped distinction
• Adopted by major federations including USAPL, making it the de facto standard in the United States

Limitations

• Cannot be directly compared to historical Wilks scores from before 2019
• Less universally recognized internationally than Wilks
• Still a relatively recent formula — long-term validation is ongoing

The IPF GL Formula (2019)

The International Powerlifting Federation (IPF) — the largest and most prestigious raw powerlifting federation globally — adopted its own proprietary scoring system in 2019, called IPF GL (Goodlift Points). Like DOTS, it replaced the older Wilks formula, but with a different mathematical approach and fitted to IPF-specific competition data.

How It Works

IPF GL uses an exponential function rather than a polynomial, fitted to IPF World Championship data. The formula is structured as:

IPF GL = 100 × Total / (a × e^(b × body weight) − c × e^(d × body weight))

Where the constants a, b, c, and d are specific to sex (men/women) and equipment class (raw/equipped).

Strengths

• Fitted to IPF World Championship data — directly relevant for IPF competition
• Exponential form may better capture the non-linear body weight to strength relationship
• The official formula for IPF World Championships and affiliated national federations (including British Powerlifting, Powerlifting Australia at the international level)

Limitations

• Not used outside IPF-affiliated competitions — most local and national non-IPF federations use Wilks or DOTS
• The formula constants are updated periodically — older IPF GL scores may not be directly comparable to current ones
• More complex to calculate manually compared to polynomial approaches

Formula Comparison at a Glance

Formula	Introduced	Math Type	Key Federations	Raw/Equipped Distinction
Wilks	1998	5th-degree polynomial	WPC, WABDL, many local	No (original); Yes (2020 update)
DOTS	2019	4th-degree polynomial	USAPL, Powerlifting Australia	Yes
IPF GL	2019	Exponential function	IPF, British Powerlifting, affiliates	Yes

Which Formula Should You Use?

If you compete in an IPF-affiliated federation, your official score is IPF GL. If you compete under USAPL or Powerlifting Australia, your official score is DOTS. If you compete in WPC, WABDL, or many local federations, Wilks is still commonly used.

For personal tracking or comparing yourself to lifters from different eras and federations, Wilks remains the most historically comparable. Use our Wilks calculator for historical comparison and our IPF GL calculator for current competition context.

What Makes a Good Score

Rough benchmarks for Wilks (raw, drug-tested) to give context:

• <200: Beginner to intermediate recreational lifter
• 200-300: Solid intermediate
• 300-400: Advanced — competitive at local/regional level
• 400-500: National-level competitor
• 500+: Elite; potential for world-class competition

DOTS and IPF GL scores are designed to produce similar numeric ranges to Wilks, so roughly the same benchmarks apply, though direct comparison across formulas is not exact.

Frequently Asked Questions

Can I compare my Wilks score to my IPF GL score?

Not directly — they are different scales. Both attempt to normalize performance for body weight, but the formulas produce different numbers for the same total. At elite levels, DOTS and IPF GL tend to reward lighter weight classes slightly more than the original Wilks formula did. Always compare within the same formula system.

Which formula is most accurate at equalizing across weight classes?

DOTS and IPF GL were both developed with more recent competition data and address known weaknesses of the original Wilks formula. Whether one outperforms the other at any given moment depends on the most recent competitive data — both are considered improvements over original Wilks for current lifters.

Does my federation have to use Wilks?

No. Many federations have switched to DOTS or IPF GL. Some use their own proprietary systems. Check your specific federation's rulebook for which coefficient is used in competition scoring.

What is allometric scaling and is it better than these formulas?

Allometric scaling uses a power law (total / body_weight^exponent) rather than regression-fitted polynomials. It has theoretical appeal but requires choosing the right exponent, which varies by lift and population. None of the major federations currently use pure allometric scaling for competition scoring, though it appears in academic sports science literature.

How do I calculate my Wilks or IPF GL score?

Use our Wilks score calculator for the Wilks formula and our IPF GL points calculator for the IPF formula. Both require your body weight and competition total (squat + bench + deadlift).