Walk into a GPC, AAPF, or AWPC-affiliated meet and you’ll see “Best Lifter” decided by Glossbrenner, not Wilks. It’s a formula with a genuinely different origin story than the polynomial-based systems most lifters are used to.
Where Glossbrenner came from
Before Wilks existed, powerlifting used the Schwartz formula for men and the Malone formula for women — both built in the 1970s from limited competition data, before large-scale statistical regression was practical. When the APF needed an updated bodyweight coefficient system in 2004, statistician Herb Glossbrenner didn’t start from scratch — he averaged the Schwartz/Malone coefficient with the Wilks coefficient at each bodyweight, reasoning that Schwartz tended to favor lighter lifters while Wilks favored heavier ones, so an average of the two would land somewhere more balanced.
It’s a table, not an equation
This matters practically: unlike Wilks, DOTS, or IPF GL, Glossbrenner was never published as a clean polynomial or exponential formula. It exists as an official lookup table — coefficients published at 0.05kg bodyweight increments across the men’s (40–231kg) and women’s (40–169kg) ranges, with interpolation between rows for bodyweights that fall between listed values.
Why this makes it harder to implement correctly
A calculator claiming to compute “Glossbrenner” from a formula rather than the actual published table is, at best, approximating it. Because the table was built by averaging two independently-fitted curves, it doesn’t reduce to a clean equation the way Wilks does — the only way to get it exactly right is to use the real table values.
How our calculator handles this
Our Glossbrenner Calculator uses anchor points taken directly from the official APF/WPC published tables, with linear interpolation between them for bodyweights that fall in between — the same method the official documentation itself describes for values not explicitly listed.
Should you care which formula your federation uses?
Only if you’re chasing a Best Lifter award. For general “how strong am I relative to my bodyweight” purposes, Glossbrenner, Wilks, and DOTS all tell a broadly similar story at typical bodyweights — the meaningful differences show up mainly at the extremes and in exactly which number wins a trophy.
Glossbrenner vs Wilks at a glance
| Glossbrenner | Wilks (classic) | |
|---|---|---|
| How it works | Coefficient tables, derived by averaging earlier formulas | A single 5th-degree polynomial per sex |
| Typical users | GPC/WPC-family and some other non-IPF federations | Historically most federations; still common in rankings |
| Easy to calculate by hand? | Only with the correct table | Yes, with a spreadsheet |
| Scale | Bodyweight coefficient × total, on a broadly similar scale to Wilks | Bodyweight coefficient × total, usually 300–500 for competitive lifters |
Because the two scales look similar, it is tempting to compare them directly. Don’t: the coefficients differ by bodyweight, so the same total can rank differently under each formula. Only compare scores calculated with the same formula.
Which lifters are affected most?
Formulas tend to agree most in the middle weight classes, where most of the data sits. Differences usually show up at the extremes: the lightest and the heaviest lifters. If you compete at either end of the bodyweight range, calculate your result with both formulas before you set a “best lifter” goal, because a placing under one formula may not hold under the other.
Frequently asked questions
Why don’t all federations use the same formula?
Each federation chooses the formula that best fits its own rules and lifter population, and some keep a formula for consistency with historical records. That is why the same total can win best lifter at one meet and not at another.
Is Glossbrenner used for equipped or raw lifting?
It is applied to both in federations that use it. The coefficient depends on bodyweight and sex, not on division.
Where can I compare all the formulas?
Our DOTS vs Wilks vs IPF GL guide compares the three most common formulas, and the Wilks calculator guide explains Wilks step by step.