Sinclair Coefficient Calculator
Written by Thierno Sadou Diallo, formula verified per our methodology • Last checked on 9/8/2026
The Sinclair total is calculated by multiplying the total (snatch + clean and jerk) by a coefficient dependent on body weight. An 81 kg man with a 300 kg total gets a coefficient of about 1.269, giving a Sinclair total of about 380.7 points.
Explanation
In Olympic weightlifting, athletes compete in separate body-weight categories, which makes it hard to directly compare totals (snatch + clean and jerk) between a light athlete and a heavy one. The Sinclair coefficient, named after statistician Roy A. Sinclair, corrects for this effect by normalizing the total relative to the heaviest athlete's body weight (a reference value B, set from the world record of the heaviest category): the lighter an athlete is, the higher their coefficient, which mathematically offsets the natural strength advantage that greater body mass provides. The A and B constants in the formula are recalculated by the International Weightlifting Federation (IWF) at each Olympic cycle, based on the most recent world records in each category: this calculator uses the values for the 2026 cycle. This score is specific to Olympic weightlifting and should not be confused with our Wilks score calculator or our DOTS score calculator, which serve an equivalent function for powerlifting, a different discipline based on the squat + bench press + deadlift total.
Example: an 81 kg man, total of 300 kg
Inputs
Body weight: 81 kg. Total: 300 kg. Sex: male.
Calculation
Coefficient = 10^(0.722762521 × (log10(81 ÷ 193.609))²) ≈ 1.269. Sinclair total = 300 × 1.269 ≈ 380.7 points.
Result
This 300 kg total corresponds to a Sinclair total of about 380.7 points.
Frequently asked questions
Why does the coefficient become 1 beyond a certain body weight?
Because the Sinclair coefficient is set relative to the world record of the heaviest weight category (with no upper limit): an athlete whose body weight reaches or exceeds this reference has, by definition, no weight disadvantage to offset, so their coefficient stays at 1 (no correction applied) rather than dropping below this value.
Do the A and B constants change often?
Yes, the IWF recalculates these constants at each Olympic cycle (generally every 4 years) based on the most recent world records in each weight category, so the model always reflects the current performance level. Using constants from an old Olympic cycle would slightly skew the comparison with current performances.
Is the Sinclair total also used to compare men and women?
The calculation uses distinct A and B constants for men and women, which allows comparisons within each sex category, but a direct comparison of Sinclair totals between men and women remains debated in the weightlifting community, since physiological differences between weight categories are not necessarily symmetrical between sexes.