The formula
How to calculate wilks calculator
A raw total — squat plus bench press plus deadlift — favours heavier lifters by default, since more bodyweight generally supports more absolute strength. The Wilks score corrects for that by multiplying the total by a coefficient derived from a polynomial function of bodyweight, producing a single number that lets a 60kg lifter and a 140kg lifter be compared on the same scale.
The coefficient comes from a 5th-degree polynomial fitted to bodyweight, with separate sets of six constants for men and women published by Robert Wilks in 1994. Dividing 500 by that polynomial produces a multiplier that is applied to the total: lighter and heavier lifters both get scaled toward a comparable reference point, so the resulting Wilks score reflects relative strength for bodyweight rather than raw poundage.
Here is what each field means:
- Gender
- Bodyweight (kg)
- Squat (kg)
- Bench press (kg)
- Deadlift (kg)
Everything recalculates as you type, and the numbers in the address bar update with it, so a link to this page carries your figures with it.
The order the fields are filled in makes no difference to the result — the calculator recomputes the whole formula from whatever is currently in every field, not step by step. That means it is safe to adjust one number, watch the result change, and adjust it back, without worrying about resetting anything first.
Why wilks calculator matters
The formula behind wilks calculator is standard and has not changed in decades; what changes is the situation it gets applied to. Two households can run the identical calculation and land on very different conclusions once their own numbers — income, rate, term, balance — are dropped in, which is why a generic textbook example is less useful than a calculator you can adjust to match your own circumstances.
This tends to come up when comparing two concrete alternatives — two lenders, two savings products, two ways of structuring the same decision — rather than in the abstract. Run both scenarios through the same calculator with the same assumptions and the comparison becomes fair, because the only thing changing between the two results is the number you are actually trying to test.
The reason a page like this exists at all, rather than leaving the calculation to a spreadsheet or a textbook appendix, is that the formula behind wilks calculator is fiddly enough to get wrong by hand but not complicated enough to need specialist software. That middle ground — real enough maths to matter, simple enough to check instantly — is exactly what a dedicated calculator is for, and it is why the same figure recalculated here should match a careful manual calculation almost exactly.
In practice, most people arrive at a page like this one having already tried a version of the calculation by hand or in a spreadsheet, and use the calculator here to confirm it rather than replace it. That is a reasonable way to use it — the two should agree to the last decimal place if the same inputs and the same formula are used, and if they do not, the formula shown above is the one to check your own working against first.
Worked example
Work through the defaults on this page:
- Gender: male
- Bodyweight: 80 kg
- Squat: 150 kg
- Bench press: 100 kg
- Deadlift: 180 kg
That gives:
- Total: 430 kg
- Wilks coefficient: 0
- Wilks score: 0
These figures are only the calculator's own starting values, included so the working is visible rather than hidden inside the tool above. Replace them with your own numbers and the same arithmetic applies — nothing about the method changes, only the inputs feeding it.
Reading the result
A higher Wilks score means a stronger performance relative to bodyweight, not necessarily a bigger total. Two lifters with very different totals and bodyweights can post the same Wilks score, which is the entire point of the formula — it is the standard way powerlifting meets rank lifters across different weight classes on one leaderboard.
Where this goes wrong. Wilks was the standard in most powerlifting federations for decades, but many federations have since moved to the newer DOTS formula (see the separate DOTS Calculator) because Wilks scales less accurately at the very low and very high ends of the bodyweight range — it tends to slightly favour heavier lifters at the extremes. Check which formula a specific federation or meet actually uses before treating a Wilks score as the official ranking figure.
A useful check on any unfamiliar result is to compare it against a rough mental estimate first — round the inputs to convenient numbers and see whether the calculator's answer lands in roughly the same territory. A wildly different figure usually means one of the fields was entered in the wrong unit, most often a percentage typed as a whole number where a decimal was expected, or the reverse.
It is still recognised and calculated by many federations and lifting platforms, but a growing number of federations, including the IPF, switched to DOTS or other newer formulas as their official ranking coefficient starting around 2019-2020. Wilks remains widely known and is still useful for historical comparisons against older meet results.
The relationship between bodyweight and strength potential differs between men and women due to differences in average body composition, so Robert Wilks fitted separate sets of six polynomial constants to each dataset rather than using one shared curve.
The headline figure is total. With 80 kg bodyweight, 150 kg squat and 100 kg bench press, that comes to 430 kg. Change any field and the figure moves with it.
Whenever one of the underlying figures changes — a new interest rate, a different balance, an updated term — since the result only reflects what is currently in the fields. There is no need to keep a separate record of past results; the web address for a filled-in version already carries the figures used to produce it.
Not unless a tax rate or a fee is explicitly one of the inputs above. Where it is not, the figure shown is a gross calculation, and any tax due depends on your personal circumstances and current tax rules, which are worth checking separately.
The arithmetic itself is exact — the calculator applies the formula shown above precisely, with no rounding until the final figure is displayed. The uncertainty, where it exists, is entirely in the inputs: an estimated rate or an approximate balance carries that same approximation through to the result.