The Wilks Calculator takes two numbers — your bodyweight and your total — and returns a single score that lets you compare your strength against lifters in completely different weight classes. It’s one of the oldest and most widely recognized scoring systems in powerlifting, and understanding exactly how to use it (and what it’s actually telling you) makes the number a lot more useful than just a bragging-rights figure.
What the Wilks score is for
Raw strength doesn’t scale in a straight line with bodyweight. A lifter who weighs twice as much as another isn’t reliably twice as strong — muscle cross-sectional area, which drives force production, scales differently than body mass as size increases. Without some kind of correction, heavier lifters would always out-total lighter lifters purely because of size, regardless of who trained harder or has better relative strength. The Wilks formula exists specifically to correct for that, using a 5th-degree polynomial fitted to bodyweight so a 60kg lifter and a 140kg lifter can be placed on the same comparative scale.
Step-by-step: how to use the calculator
- Choose your sex. The underlying coefficients are fitted separately for men and women, since the bodyweight-to-strength relationship differs meaningfully between the two datasets the formula was built from.
- Toggle kg or lb. Use whichever unit matches your gym scale and the plates you actually loaded — the calculator converts internally, so either is fine as long as you’re consistent between the two fields.
- Enter your bodyweight. Use your bodyweight at the time of the lift (or your competition weigh-in weight, if this is a meet total), not your normal walk-around weight.
- Enter your total. This is your best squat, best bench press, and best deadlift added together — competition numbers if you have them, your best gym numbers if you don’t.
The score updates instantly as you type. There’s no submit button, no account, and no data leaves your browser — the entire calculation runs client-side in JavaScript.
Worked example
Take a male lifter weighing 82.5kg with a 600kg total. Running those numbers through the Wilks polynomial produces a score in the low 400s — solidly “Advanced” territory on most informal classification charts, a level reached by lifters with several years of dedicated, well-programmed training behind them.
Now compare that to a much lighter lifter — say 60kg bodyweight with a 400kg total. Despite lifting 200kg less in absolute terms, that lifter’s Wilks score lands in a similar range, because their total represents a much larger multiple of their own bodyweight. This is the entire point of the formula: it’s answering “who is pound-for-pound stronger,” not “who lifted more in kilograms.”
Classic Wilks vs Wilks 2 — don’t mix them up
This calculator uses the original 1994/1997 Wilks coefficients — the version that was the sport’s standard for over two decades. In March 2020, the coefficients were revised (often called “Wilks 2” or “Wilks 2020”) to correct how the original formula treated lifters at the very light and very heavy ends of the bodyweight spectrum, using more current competition data.
These two versions are not interchangeable. The same lifter with the same total will get a noticeably different score depending on which version is used. If your federation, meet software, or leaderboard has moved to the 2020 coefficients, use the Wilks 2 Calculator instead — plugging your numbers into the wrong version and comparing the result to someone else’s Wilks-2 score will give you a misleading picture of who’s actually stronger relative to bodyweight.
Common mistakes to avoid
- Using walk-around weight instead of lift-day weight. Even a few kilograms of difference can meaningfully shift your score, especially near the lighter end of the bodyweight range where the polynomial curve is steeper.
- Mixing kg and lb between fields. Always double-check both bodyweight and total are in the same unit before reading the result.
- Comparing scores across formula versions. A 420 Wilks and a 420 “Wilks 2” are not the same level of relative strength — always confirm which version you’re looking at before treating two numbers as comparable.
Frequently asked questions
Is a higher Wilks score always better?
Yes — within a given version of the formula, a higher score always represents greater strength relative to bodyweight, regardless of which weight class the lifter competes in.
Does the Wilks score account for age?
No. Wilks is a pure bodyweight-adjustment formula. Age-adjusted comparisons use separate multipliers on top of a base coefficient system, typically applied by federations for Masters (older lifter) categories.
Can I use this for bench-press-only or single-lift comparisons?
Wilks was designed and validated using full powerlifting totals (squat + bench + deadlift). Using it on a single lift will still produce a number, but it wasn’t built or tested for that use case, so treat single-lift comparisons as informal at best.
Where to go next
For the full breakdown of how Wilks compares to DOTS and IPF GL — including when each one is actually the “correct” formula to use — read DOTS vs Wilks vs IPF GL. If you’re specifically deciding between classic Wilks and the 2020 revision, that same article covers the practical differences in more depth.