Q-points,
across bodyweights

The formula is the authors' own. Q-points was published by Marianne Huebner, David Meltzer, Ásgeir Bjarnason and Aris Perperoglou, and the expression used here is taken from the file they publish themselves on OSF rather than from anybody's reimplementation of it:

men   total × 463.26 / (416.7 − 47.87 x⁻² + 18.93 x²)
women total × 306.54 / (266.5 − 19.44 x⁻² + 18.61 x²)
where x is bodyweight in kilos divided by 100

What it is. A quantile regression, which is where the Q comes from, fitted to 3,559 results from international and continental IWF qualifying championships between 2017 and 2021, with known doping violations removed and one result per athlete per year per category. Sinclair favours certain body masses; this was built to reduce that.

How far it was checked, stated exactly, because it is less than the other calculators here. The Dots and Goodlift page could be verified against 3.7 million published scores. No equivalent public dataset of Q-points exists, so this was checked for BEHAVIOUR rather than against a reference: the coefficient falls monotonically as bodyweight rises, and the score equals the raw total at 180kg for men and 160kg for women, which is the heavyweight reference the model is scaled to. Those are the properties a bodyweight correction must have, and they hold. It is not the same standard of proof and this page will not pretend otherwise.

Below 50kg for men and 41kg for women it returns nothing. Those are the floors the authors state, and the curve's inverse-square term climbs steeply underneath them, so a figure there would be arithmetic rather than a score.

Why not Sinclair. It was asked for and could not be built honestly: the current coefficients are reissued every Olympic cycle, the IWF's own pages return 403, and the most recent set that can be verified anywhere is 2017 to 2020. Building a calculator on coefficients that cannot be sourced is what the powerlifting qualifying total page was rebuilt to stop doing.