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Sinclair Coefficient Calculator

Enter bodyweight, total lifted and sex to find your Sinclair score.

How it is calculated

For a lifter lighter than the reference bodyweight B, the coefficient is coeff = 10A × (log10(bw / B))2, where bw is bodyweight in kg. The engine uses A = 0.722762521 and B = 193.609 for men, and A = 0.787004341 and B = 153.757 for women: the 2021–2024 constants. The IWF revises them each Olympic cycle, so a current federation table can differ slightly. At or above B the coefficient is exactly 1. The Sinclair score is coeff × total, where total is snatch plus clean and jerk in kg. The coefficient is shown with six decimals and the score with two. Bodyweight and total must be above zero. Any sex value other than female is treated as male.

Worked example

A man weighing 81 kg with a 320 kg total. log10(81 / 193.609) = -0.37844, squared = 0.14322. Multiply by A: 0.722763 × 0.14322 = 0.10351. The coefficient is 100.10351 = 1.269147. Score: 1.269147 × 320 = 406.127, shown as 406.13. So the 320 kg total counts as a Sinclair total of 406.13 when compared with lifters of other bodyweights.

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Common mistakes

  • Entering the weight in pounds. Both bodyweight and total are in kilograms, so a 176 lb lifter is about 80 kg; pounds would give a wrong coefficient and an inflated total.
  • Entering a single lift. The total is snatch plus clean and jerk, so entering only one of them understates the score.
  • Choosing the wrong sex setting. Men and women have different constants, and the same bodyweight and total give a different score with each.
  • Expecting a bonus above the reference bodyweight. At or above 193.609 kg for men and 153.757 kg for women the coefficient is 1, so the Sinclair total equals the raw total.

About this calculator

The Sinclair coefficient, published annually by the International Weightlifting Federation, lets Olympic weightlifting results be compared fairly across different bodyweight categories — since heavier lifters can move more absolute weight, a raw kilogram comparison would always favor the superheavyweights. The coefficient is calculated as 10^(A × (log₁₀(x/b))²) for a lifter of bodyweight x below a reference bodyweight b (the bodyweight of the heaviest lifter in that sex’s class in recent world-record history), where A is a constant fit from historical data; lifters at or above b get a coefficient of 1.

Multiplying a lifter’s total (snatch + clean and jerk) by their Sinclair coefficient gives the Sinclair total — a bodyweight-adjusted score used to determine “best lifter” awards at competitions spanning multiple weight classes, since it puts a 55 kg lifter and a 110 kg lifter on the same comparative scale. Bodyweight, the total lifted and sex are all it needs to give the Sinclair coefficient and the adjusted Sinclair total used to compare lifters across weight classes.

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  • Editorial team

    These are the 2021–2024 constants; the international weightlifting body revises them each Olympic cycle, so a score here can differ a little from a current table. It is still fine for comparing two lifters under the same constants. If your federation's score differs, post the bodyweight, total, sex and the year of its table.

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