Turn your snatch and clean and jerk total into a bodyweight-adjusted Sinclair score, so a 61 kg lifter and a 109 kg lifter can be compared on one scale. Coaches, meet directors and lifters use it to rank best lifters, set club records and track progress across weight classes.
Enter bodyweight and both lifts to see your score. If you leave A and b blank, the calculator uses the IWF coefficients for the 2021-2024 Olympic cycle for the selected sex (men A 0.722762521, b 193.609 kg; women A 0.787004341, b 153.757 kg). The IWF publishes new values each cycle, so type newer numbers if your federation uses them. The age factor is a multiplier from your masters federation’s table; if you leave it blank, the calculator uses 1 (no adjustment).
How to Calculate Sinclair Score
Add your best snatch and best clean and jerk, then multiply the total by your Sinclair coefficient, which depends on bodyweight and sex. An 81 kg man who snatches 120 kg and clean and jerks 150 kg has a 270 kg total and a coefficient of 1.2691, so his Sinclair score is 342.67.
- Total the lifts: 120 + 150 = 270 kg.
- Divide bodyweight by b and take the log: log10(81 ÷ 193.609) = −0.37844.
- Square it and multiply by A: 0.722762521 × 0.378442 = 0.10351.
- Raise 10 to that power: 100.10351 = 1.2691.
- Multiply: 270 × 1.2691 = 342.67.
How to Calculate the Sinclair Coefficient
The coefficient grows as your bodyweight falls below a reference value, b, set near the bodyweight of the heaviest world-class lifters. Heavier lifters can move more weight, so raw totals favour the big classes. Sinclair asks what this lifter would total as a heavyweight of the same ability. At or above b, the coefficient is exactly 1.
Formula: X = log10(bodyweight ÷ b). If bodyweight < b, coefficient = 10^(A × X^2); otherwise coefficient = 1. Sinclair total = (snatch + clean and jerk) × coefficient. Masters-adjusted score = Sinclair total × age factor.
- Sex: picks the men’s or women’s values of A and b that apply when those fields are blank.
- Bodyweight: your official weigh-in weight in kilograms.
- Best snatch and Best clean and jerk: your heaviest successful lifts, in kilograms. They add up to the raw total.
- Coefficient A and Constant b: optional statistical constants. Left blank, the calculator uses the IWF values for the 2021-2024 cycle; type newer ones if they have been published.
- Masters age factor: an optional multiplier from your masters age table. Left blank, it uses 1, which suits open competition.
Sinclair Scores for Different Lifters
| Lifter | Bodyweight | Snatch + C&J | Coefficient | Sinclair total |
|---|---|---|---|---|
| Man | 81 kg | 120 + 150 = 270 kg | 1.2691 | 342.67 |
| Woman | 64 kg | 85 + 105 = 190 kg | 1.3003 | 247.05 |
| Man | 102 kg | 150 + 185 = 335 kg | 1.1376 | 381.10 |
| Woman | 87 kg | 95 + 120 = 215 kg | 1.1172 | 240.20 |
| Masters man, age factor 1.100 | 73 kg | 100 + 120 = 220 kg | 1.3480 | 296.56 (326.22 adjusted) |
| Man above b | 200 kg | 175 + 225 = 400 kg | 1.0000 | 400.00 |
Using the IWF Sinclair Coefficients
Always score lifters with the same set of constants, because the IWF recalculates A and b for each four-year Olympic cycle. A score worked out with 2017 values will not match one using 2021 values.
- Use official numbers. Your Sinclair total should use the weigh-in bodyweight and the lifts that counted on the platform, not training maxes.
- Do not chase decimals. Two lifters within a point or two are effectively level; small changes in bodyweight move the coefficient.
- Masters scoring adds a second step. A masters Sinclair calculator multiplies the Sinclair total by an age factor, usually from the Meltzer-Faber tables. Ask your federation which table applies and enter that factor here.
- Compare like with like. Sinclair was built for Olympic weightlifting; powerlifting uses other systems.
What Is a Good Sinclair Score?
A good score is one that beats your last one or places well at your level, since age, sex and experience all shift what is realistic. For perspective, the highest men’s Sinclair totals in history are around 500 and the best women’s around 365. This tool puts you on the same scale those records use. For the history and the published formula, see Wikipedia’s article on the Sinclair coefficient.
Common questions about Sinclair scores
How do you calculate a Sinclair score?
Add your best snatch and best clean and jerk, then multiply that total by your Sinclair coefficient. An 81 kg man with a 270 kg total has a coefficient of 1.2691, giving 342.67.How do you calculate the Sinclair coefficient?
Divide your bodyweight by b, take the base-10 log, square it and multiply by A. Raise 10 to that power. If your bodyweight is at or above b, the coefficient is exactly 1.What is a good Sinclair score?
There is no single cut-off. A good score is one that beats your previous best or places well at the level you compete. As a ceiling, the best men in history have scored around 500 and the best women around 365, so most club lifters sit far below that.Which IWF Sinclair coefficients does the tool use?
With the coefficient fields blank, it uses the IWF values for the 2021-2024 cycle: A of 0.722762521 and b of 193.609 kg for men, and A of 0.787004341 and b of 153.757 kg for women. You can type newer values in as soon as they are published.Does the Sinclair formula include age?
No. Masters competitions add an age factor on top, often from the Meltzer-Faber tables. Enter that factor here and the tool shows a masters-adjusted score beside the open one.Why did my Sinclair score change with new coefficients?
Each Olympic cycle the IWF refits A and b to recent world records, so the same lift and bodyweight can score a few points higher or lower. Scores are only comparable when they use the same set of coefficients.Related Calculators
Planning your next training block? The one rep max calculator for estimating your best single helps you set working weights from recent sets, and the workout volume calculator for sets, reps and load tracks how much work each session adds up to. If you are deciding between weight classes, the lean body mass calculator shows how much of your bodyweight is muscle. Pair them with the Sinclair calculator to see how a class change could affect your score.