If you are trying to understand what the Sinclair formula is, here is the practical answer: it is the bodyweight-adjustment system used in Olympic weightlifting to compare performances across lifters of different sizes. It turns a raw snatch, clean and jerk, or total into a normalized score so a lighter lifter and a heavier lifter can be compared more fairly. You can calculate yours with the Sinclair Calculator.
This matters because Olympic weightlifting is split into bodyweight classes, but meets and rankings often still need a way to answer a broader question:
Who was the best lifter overall?
The Sinclair coefficient exists to answer that question.
■What the Sinclair Formula Does
The basic purpose of the Sinclair formula is to adjust a lifter's performance based on bodyweight.
In Olympic weightlifting, heavier lifters usually lift more in absolute terms. That does not automatically mean they are displaying more impressive performance relative to size. A lighter lifter with a smaller total may actually be the better athlete when you account for bodyweight.
The Sinclair system corrects for that by multiplying the lift or total by a coefficient based on bodyweight.
The simplified concept is:
Sinclair score = total x Sinclair coefficient
If the lifter is lighter than the reference bodyweight, the coefficient is above 1.0. If the lifter is at or above the reference bodyweight, the coefficient becomes 1.0 and no upward adjustment is applied.
■Where the Formula Is Used
The Sinclair formula is specific to Olympic weightlifting, not powerlifting.
That means it is used to compare:
- ■snatch
- ■clean and jerk
- ■total
It is not the same as:
- ■Wilks
- ■DOTS
- ■IPF GL
Those are powerlifting coefficients used for squat, bench press, deadlift, and total in different federations. If you want the powerlifting side of that conversation, read Wilks vs DOTS vs IPF GL: Powerlifting Scoring Systems Explained.
■The 2025-2028 Sinclair Coefficients
The International Weightlifting Federation updates Sinclair coefficients by Olympic cycle.
For the 2025-2028 cycle, the site uses:
| Group | A | B |
|---|---|---|
| Men | 0.722 | 175.508 kg |
| Women | 0.7538 | 152.2 kg |
You do not need to memorize those constants, but it helps to know what they mean:
- ■A shapes the curve
- ■B is the reference bodyweight
The reference bodyweight acts as the "no adjustment" point. Once a lifter is at or above that level, the coefficient is 1.0.
■How the Formula Works Conceptually
The exact formula is logarithmic, but the practical idea is straightforward:
- ■lighter lifters get a bigger multiplier
- ■heavier lifters get a smaller multiplier
- ■very heavy lifters eventually get no multiplier at all
That lets a 67 kg lifter and a 109 kg lifter be compared without pretending bodyweight has no effect on performance.
The formula used for lifters below the reference bodyweight is:
coefficient = 10^(A x (log10(bodyweight / B))^2)
Then:
Sinclair score = total x coefficient
The math looks ugly, which is exactly why calculators exist. The Sinclair Calculator handles the formula instantly.
■A Simple Example
Suppose a male lifter weighs 81 kg and totals 300 kg.
Because 81 kg is below the male reference bodyweight of 175.508 kg, he receives a coefficient above 1.0. That means his Sinclair score will be higher than 300, reflecting the fact that he produced that total at a much lower bodyweight.
Now compare him to a lifter at 120 kg with a 320 kg total. The heavier lifter has the bigger raw total, but after normalization, the 81 kg lifter may still come out ahead.
That is the whole point of the formula.
■What Counts as a Good Sinclair Score?
The exact standards vary by federation depth and competitive level, but broad ranges are still useful:
| Sinclair score | General interpretation |
|---|---|
| Below 150 | Beginner |
| 150 to 250 | Intermediate |
| 250 to 350 | Advanced |
| 350 to 450 | Elite |
| Above 450 | World-class territory |
These are rough guideposts, not universal laws. A local meet winner and an international medalist do not operate on the same scale, even if both are "elite" in a broad sense.
■Why the Sinclair Formula Exists at All
Without a coefficient system, absolute totals would dominate every comparison. That would make bodyweight classes useless for any all-around ranking conversation.
Sinclair solves the fairness problem by acknowledging a basic truth:
strength scales with body size, but not in a perfectly linear way
That is why a simple "total divided by body weight" rule is not enough. The relationship between size and performance is more complicated, so the coefficient model is designed to match that curve more closely.
■Sinclair vs Raw Totals
Raw totals still matter. Weight classes still matter. Medals are still awarded in the athlete's own class.
Sinclair does not replace that. It adds a second layer for cross-class comparison.
Think of it this way:
- ■raw total tells you how much was lifted
- ■Sinclair tells you how impressive that was relative to bodyweight
Both matter. They just answer different questions.
■Sinclair vs Powerlifting Coefficients
Lifters sometimes try to compare Sinclair with Wilks or DOTS directly. That does not work well, because they were built for different sports with different performance distributions.
| Coefficient | Sport |
|---|---|
| Sinclair | Olympic weightlifting |
| Wilks | Powerlifting |
| DOTS | Powerlifting |
| IPF GL | Powerlifting |
If you compete in both sports, keep the score systems mentally separate. A great Sinclair number and a great DOTS score are both valuable, but they are not interchangeable.
■When to Use Sinclair
Use the formula when you want to:
- ■compare lifters across bodyweights
- ■understand how your total ranks relative to size
- ■follow "best lifter" discussions in weightlifting
- ■compare your snatch, clean and jerk, or total in a standardized way
It is especially useful for lighter lifters who get overshadowed by raw totals. Sinclair often reveals just how impressive those lighter-class performances actually are.
■Common Mistakes With Sinclair
Comparing Different Lift Types
Do not compare a Sinclair-adjusted snatch to someone else's Sinclair-adjusted total and pretend the scores mean the same thing.
Using the Wrong Gender Coefficients
The formulas differ. Make sure the correct coefficient set is used.
Comparing Outdated Cycles
Sinclair constants change across cycles, so the scoring environment shifts too.
Treating the Coefficient as More Important Than the Sport
At the end of the day, weightlifting is still about making lifts on the platform. The coefficient is a comparison tool, not the sport itself.
■How to Use the Score Productively
For most lifters, Sinclair is best used as a benchmarking tool:
- ■Calculate your current score.
- ■Track how it changes as your total and bodyweight change.
- ■Compare yourself across training phases or bodyweight classes.
This is especially useful if you are deciding whether a bodyweight increase actually improved your competitive value. A higher raw total at a much higher bodyweight does not always produce a better Sinclair score.
That is the same broader lesson behind all bodyweight-adjusted scoring: context matters more than raw numbers alone. If you want a simpler general benchmark outside of Olympic lifting, the Strength Standard Calculator is often the easier place to start.
■FAQ
What is the Sinclair formula used for?
It is used in Olympic weightlifting to compare performances across different bodyweight classes.
What lifts can I use the Sinclair formula for?
Most commonly the Olympic total, but it can also be applied to an individual snatch or clean and jerk if you are comparing like with like.
Is Sinclair the same as Wilks or DOTS?
No. Sinclair is for Olympic weightlifting. Wilks and DOTS are powerlifting coefficients.
What does a Sinclair coefficient of 1.0 mean?
It means the lifter is at or above the reference bodyweight, so no upward bodyweight adjustment is applied.
What is the easiest way to calculate my score?
Use the Sinclair Calculator. If you also compete in powerlifting, compare that context separately with Wilks vs DOTS vs IPF GL: Powerlifting Scoring Systems Explained.