Weightlifting Sinclair Coefficient Calculator
Compare Olympic weightlifting totals across bodyweights with the Sinclair coefficient and Sinclair total.
How it works
If bodyweight < b: coeff = 10^(A × log₁₀(bodyweight ÷ b)²), else coeff = 1 · Sinclair total = coeff × total
The Sinclair coefficient lets you compare Olympic weightlifters across bodyweight classes by projecting every lifter’s total to what they might lift as a heavyweight of the reference bodyweight b. Lifters below that reference get a coefficient above 1.0 (a boost), while anyone at or above it gets exactly 1.0. Multiplying the coefficient by the two-lift total gives the Sinclair score used to crown "best lifter" at meets. The constants A and b are updated by the IWF each Olympic cycle.
Worked example
A male lifter weighing 90 kg with a 350 kg total: x = log₁₀(90 ÷ 175.508) = −0.290, so coeff = 10^(0.75195 × 0.290²) = 10^0.0632 = 1.157. Sinclair total = 1.157 × 350 = 404.8 points.
Sources: Sinclair coefficients — Wikipedia
Frequently asked questions
What is the Sinclair coefficient for?
It answers "who is the best lifter regardless of weight class" by scaling every total to a common reference bodyweight. The lifter with the highest Sinclair total wins best-lifter awards even if they compete in a lighter category.
Why does a heavier lifter get a coefficient of 1.0?
The reference bodyweight b is set near the world-record holder’s weight, so lifters at or above it are not scaled up — the coefficient only boosts lighter athletes to make the comparison fair.
How is Sinclair different from Wilks or DOTS?
Sinclair is the official Olympic-weightlifting metric (snatch + clean & jerk). Wilks and DOTS are powerlifting formulas built from squat, bench and deadlift totals with different curves, so they are not interchangeable.
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This calculator is for educational purposes. Double-check important results before acting on them.