Calculator: Sinclair, Q-points, Robi
Sinclair and Q-Points Calculator
Sinclair and Q-points both adjust a weightlifting total for bodyweight, so a 60 kg lifter and a 110 kg lifter can be ranked on one list. Enter your total and bodyweight for your Sinclair score, Q-points and Robi points, and to see how your total compares with competitive lifters in your class.
Calculate your Sinclair score and Q-points
Give your total, or your snatch and clean and jerk for your snatch to clean and jerk ratio and a ranking of each lift. Add your age to be compared with lifters of your age group as well.
How often the next attempt is made
Lifters at national meets make 84% of their opening snatches. After a made opener, the chance of making the second attempt falls as the jump grows. Every attempt's make rate is in the study how often weightlifters miss.
| Second attempt | +2 kg | +3 kg | +5 kg |
|---|---|---|---|
| Snatch | 78% | 74% | 72% |
| Clean and jerk | 81% | 76% | 74% |
How the Sinclair coefficient works
The Sinclair coefficient is a multiplier that grows as bodyweight falls. It comes from the world record totals across the weight classes, fitted to a curve that ends at a bodyweight called b. A lifter at or above b gets a coefficient of 1, so their Sinclair score equals their total, and your score is the total a lifter that heavy would need to match yours. Everyone lighter than b gets a coefficient above 1:
coefficient = 10A × (log10(bodyweight ÷ b))2, and Sinclair score = total × coefficient.
The IWF refits A and b after each Olympic cycle, so a score is only comparable with scores worked out from the same set. This calculator uses the 2025 to 2028 set unless you choose another.
Sinclair coefficient constants by Olympic cycle
Swipe the table sideways to see the women's constants.
| Cycle | Men A | Men b (kg) | Women A | Women b (kg) |
|---|---|---|---|---|
| 2025 to 2028 | 0.700767819 | 201.159 | 0.674107991 | 163.918 |
| 2021 to 2024 | 0.722762521 | 193.609 | 0.787004341 | 153.757 |
| 2017 to 2020 | 0.75194503 | 175.508 | 0.783497476 | 153.655 |
| 2013 to 2016 | 0.794358141 | 174.393 | 0.89726074 | 148.026 |
How Q-points work
Q-points do the same job as Sinclair with a newer curve. Sinclair is fitted to the world record totals; Q-points are fitted to the 90th-percentile totals of senior international lifters at each bodyweight. USA Weightlifting has picked its best lifters with Q-points since 2025, and British Weightlifting uses them too.
Q-points = total × Tmax ÷ f(bodyweight), where f = b0 + b1 × (bodyweight ÷ 100)−2 + b2 × (bodyweight ÷ 100)2.
A man at 180 kg or a woman at 160 kg scores exactly the total. A lighter lifter scores more than the total and a heavier one less.
| Constants | b0 | b1 | b2 | Tmax |
|---|---|---|---|---|
| Men | 416.70 | -47.87 | 18.93 | 463.26 |
| Women | 266.50 | -19.44 | 18.61 | 306.54 |
The formula is for adults, so the calculator does not show Q-points if you enter an age under 18. A bodyweight under 50 kg for men or 41 kg for women is scored at that weight.
Q-points formula: Marianne Huebner, OSF project 8x3nb, CC BY 4.0.
Sinclair coefficient table by bodyweight
The 2025 to 2028 coefficients at 5 kg steps. Multiply a total by the figure for your bodyweight to get its Sinclair score.
| Bodyweight | Men | Women |
|---|---|---|
| 45 kg | 1.9787 | 1.6311 |
| 50 kg | 1.8036 | 1.5109 |
| 55 kg | 1.6683 | 1.4178 |
| 60 kg | 1.5611 | 1.3441 |
| 65 kg | 1.4746 | 1.2846 |
| 70 kg | 1.4037 | 1.2361 |
| 75 kg | 1.3448 | 1.1960 |
| 80 kg | 1.2953 | 1.1626 |
| 85 kg | 1.2534 | 1.1346 |
| 90 kg | 1.2176 | 1.1110 |
| 95 kg | 1.1868 | 1.0910 |
| 100 kg | 1.1603 | 1.0741 |
| 105 kg | 1.1373 | 1.0598 |
| 110 kg | 1.1173 | 1.0477 |
| 115 kg | 1.0998 | 1.0375 |
| 120 kg | 1.0846 | 1.0289 |
| 125 kg | 1.0713 | 1.0217 |
| 130 kg | 1.0597 | 1.0159 |
| 135 kg | 1.0496 | 1.0111 |
| 140 kg | 1.0408 | 1.0073 |
| 145 kg | 1.0332 | 1.0044 |
| 150 kg | 1.0266 | 1.0023 |
| 155 kg | 1.0209 | 1.0009 |
| 160 kg | 1.0161 | 1.0002 |
Robi points and GAMX
The IWF uses Robi points, which score a total against the world record in its class: the record is worth 1000 points and half the record is worth 100. Your result above shows your Robi points when your class has a world record.
The IWF adopted GAMX as an official points system in 2026. Use the official GAMX calculator to score a total with it.
Scoring a powerlifting total instead? Use the Wilks calculator, the DOTS calculator or the IPF GL points calculator.
Looking for standards for a single lift? See the snatch standards and the clean and jerk standards by bodyweight.
To see which class your bodyweight puts you in, use the weight class finder.