Sinclair Calculator

A 60 kg lifter and a 105 kg lifter cannot be ranked by their totals alone. The heavier athlete moves more weight almost every time. The Sinclair coefficient fixes that. It scales every total up to one reference body weight so two lifters of any size land on a single comparable number. Enter your sex, body weight and total above, and the calculator returns your Sinclair score plus the coefficient it used.

What the Sinclair total is

Your total is your best snatch plus your best clean and jerk in a meet. On its own it favors the big lifter. The Sinclair formula multiplies that total by a coefficient that grows as body weight falls, so a smaller athlete's number gets pushed up toward what they would lift at the heaviest class.

The math is one equation. If your body weight X is below the reference weight b, the coefficient is 10 raised to the power of A times the square of log10(X over b). At or above b the coefficient is fixed at 1.000, so your Sinclair total equals the bar.

The coefficient cycle

The constants A and b are not permanent. The IWF sets new ones for each Olympic cycle from world-record data. This calculator uses the 2021-2024 cycle, the last set the IWF has published: men A = 0.722762521 and b = 193.609, women A = 0.787004341 and b = 153.757. A score from a different cycle will differ slightly, so always note which cycle a number came from before you compare two athletes.

Reading your score

Higher is better. A Sinclair total of 344 beats a 330 regardless of who weighed more. Use it to track your own progress across a cut or a bulk, since it separates real lifting gains from changes on the scale. Use it to seed best-lifter awards at a club meet. One caveat: Sinclair compares performances within the sport of weightlifting, so it answers "who lifted best for their size," not "who is strongest in absolute terms."

For powerlifting totals across body weights, the Wilks and DOTS calculator does the same job with a different formula. To check the one-rep ceiling behind a single lift, run the one-rep max calculator.