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Wilks score
Wilks score
286.7
Coefficient
0.6827
What the Wilks coefficient is for
In powerlifting, raw strength scales with body mass. A 100 kg lifter pulling 250 kg is, in absolute terms, lifting more than a 60 kg lifter pulling 200 kg — but relative to their bodies, the smaller lifter is doing more impressive work. The sport needs a way to compare across weight classes, both for lifetime achievement charts and for “best lifter” awards at meets.
Robert Wilks, then CEO of Powerlifting Australia, published the formula in the early 1990s. It became the de facto cross-bodyweight scoring standard from 1994 until 2019, when the IPF replaced it with Wilks 2020 (and later IPF GL points) to fix biases at the extremes of the weight spectrum. Despite the formal IPF transition, the original Wilks remains the most-used coefficient in casual lifting communities and online comparison tools — which is why we use it here.
The formula
Coefficient = 500 / (a + b·BW + c·BW² + d·BW³ + e·BW⁴ + f·BW⁵)
Wilks score = Coefficient × TotalBW is in kilograms. Total is the sum of your best squat, bench press, and deadlift (in kg) — typically from a single competition.
The polynomial coefficients (1994 version):
Men:
- a = -216.0475144
- b = 16.2606339
- c = -0.002388645
- d = -0.00113732
- e = 7.01863×10⁻⁶
- f = -1.291×10⁻⁸
Women:
- a = 594.31747775582
- b = -27.23842536447
- c = 0.82112226871
- d = -0.00930733913
- e = 4.731582×10⁻⁵
- f = -9.054×10⁻⁸
You don’t need to memorize this. The calculator handles the polynomial. What matters is understanding the shape of the coefficient curve.
The shape of the curve
The coefficient is a non-monotonic function of body weight:
- It rises sharply from 50 kg to about 80 kg for men (60 kg for women).
- It peaks around 75–85 kg for men (60–70 kg for women).
- It gradually declines at heavier bodyweights.
What this means in practice: a lifter sitting in their personal Wilks-peak weight class gets the most “credit per kg” of bodyweight. A lifter at 50 kg or at 150 kg has a lower coefficient, so they need a much bigger raw total to score the same Wilks number.
A worked example
A 80 kg male lifter with a 600 kg total (220 squat / 140 bench / 240 deadlift):
- Coefficient (men, BW = 80) ≈ 0.6628
- Wilks score = 600 × 0.6628 = 397.7
A 120 kg male lifter with a 750 kg total (280 / 180 / 290):
- Coefficient (men, BW = 120) ≈ 0.5404
- Wilks score = 750 × 0.5404 = 405.3
The 120 kg lifter’s raw total is 25% higher, but their Wilks score is only 1.9% higher. The coefficient penalizes the heavier weight class. In Wilks terms, both lifters are roughly equally strong.
A 65 kg female lifter with a 350 kg total (140 / 70 / 140):
- Coefficient (women, BW = 65) ≈ 0.9017
- Wilks score = 350 × 0.9017 = 315.6
By the rule-of-thumb benchmarks, that’s a strong amateur (300+) approaching competitive regional powerlifter (400).
How to use this calculator
- Toggle metric or imperial (the formula uses kg internally; the calculator converts for you).
- Pick your sex.
- Enter your bodyweight.
- Enter your best squat, bench press, and deadlift (ideally from one same-day session — that’s what the formula is designed for).
- Read your Wilks score and the coefficient at your bodyweight.
Wilks rule-of-thumb benchmarks
| Wilks | Description |
|---|---|
| 200 | Serious recreational lifter; intermediate level |
| 300 | Strong amateur; advanced lifter |
| 400 | Competitive regional powerlifter |
| 500 | National-level competitor |
| 600 | International / elite |
| 700+ | World-class |
These are reasonable population markers for natural lifters. The thresholds don’t translate cleanly between sexes — a 400 Wilks for women is rarer than a 400 Wilks for men because there are fewer women competing at high levels, not because the formula is biased (the female coefficient is calibrated to give comparable percentile distributions).
When Wilks fails
The original 1994 Wilks formula has known issues at the extremes:
- Very lightweight male lifters (under 60 kg). The coefficient rises steeply in this range, which can over-credit small lifters. Wilks 2020 corrects this.
- Super-heavyweight lifters (over 140 kg). The coefficient flatness here under-credits genuinely strong heavies. IPF GL points handle this better.
- Equipped vs. raw lifting. The formula was developed with equipped (singlet/wraps) lifting in mind. Raw lifters can use it, but the comparisons within equipped categories are slightly different in spirit than within raw categories.
For competitive comparisons today, IPF GL points are the standard. For casual comparison and historical context, Wilks remains the most widely-cited number — which is why this calculator gives it to you.
What the score doesn’t measure
- Technique cleanness. A 700-Wilks total with a high-bar squat that barely breaks parallel and a benched press with hips in the air is a lower-quality 700 than the same number with deep, controlled lifts.
- Lifetime trajectory. A natural lifter who built to a 450 Wilks over 15 years has a different story from a peer who hit it at 22 and plateaued.
- Sustainability. A peak Wilks that came at the cost of a torn pec or a herniated disc is worse than a slightly lower one in a body still capable of training.
Use Wilks to understand where you sit, not to define what kind of lifter you are.
자주 묻는 질문
What does the Wilks coefficient do?
It normalizes powerlifting totals so that lifters of different bodyweights can be compared. The raw total in kg favors heavier lifters; the Wilks score adjusts for the diminishing returns of bodyweight on strength. A 600 kg total at 80 kg bodyweight and a 750 kg total at 120 kg bodyweight are roughly equivalent in Wilks terms.
Wilks vs. Wilks 2020 vs. IPF GL — which one is "right"?
The IPF (International Powerlifting Federation) moved from Wilks to Wilks 2020 in 2019 and to IPF GL points in 2020. Both newer formulas correct biases the original Wilks had at the very heavy and very light end. The original 1994 Wilks remains the most widely-used coefficient in casual lifting communities and on platforms like *Strength Level* — which is what we use here.
What's a "good" Wilks score?
As rough benchmarks: 200 = serious recreational lifter, 300 = strong amateur, 400 = competitive regional powerlifter, 500 = national-level competitor, 600+ = elite/international. These are rules of thumb, not absolutes — a lifter's Wilks improves with both raw strength and with reaching the bodyweight that maximizes their personal coefficient curve.
How is the Wilks formula calculated?
It's a fifth-degree polynomial fit to body weight in kg, separately for men and women. Coefficient `C = 500 / (a + b·BW + c·BW² + d·BW³ + e·BW⁴ + f·BW⁵)`. Then your Wilks score = total × coefficient. The polynomial coefficients differ by sex.
Why does the calculator score me lower than expected?
A common mistake is confusing your **best singles** for a **competition total**. The Wilks score takes the sum of your best one-rep squat, bench, and deadlift performed in the same competition. If you compare hypothetical numbers across your training history (a 200 kg squat from January and a 150 kg bench from August), your real same-day total is almost certainly lower.
What's the bodyweight that maximizes Wilks for a given lifter?
For most male lifters, peak Wilks tends to be in the 75–93 kg range. For most female lifters, 60–75 kg. Above those ranges, your absolute strength keeps growing but your Wilks score plateaus or even drops because the formula penalizes bodyweight diminishing returns.