Commentary

Why every strength standards calculator gives you a different answer

Take your bench, squat and deadlift, type them into three popular strength calculators, and there is a good chance you get three different verdicts. Intermediate on one, advanced on another, somewhere in between on the third.

The natural conclusion is that at least two of them are wrong. The more useful conclusion is that they are measuring you against different groups of people, for different reasons, and none of them was built to answer your question specifically.

Who is in the comparison group

A strength standard is a statement that people like you, at your bodyweight, typically lift about this much. The whole thing turns on who "people like you" are.

Standards built from user-submitted lifts describe the people who submit lifts to that site. That group is not the general population. It skews toward people committed enough to track and report their training, and people are more inclined to enter a lift they are proud of than one they are not. Both effects push the numbers up, so these standards tend to rate a given lift as less impressive than it would be against the population as a whole.

Standards built from competition data describe competitors. Competitive lifters are a heavily selected group, tested under specific rules, often at their best on the day. Measured against them, most gym-goers look weaker than they are relative to ordinary trained people.

Standards built by a coach or an app for a purpose describe whatever serves the purpose. They may be tuned to be encouraging, or tuned to be strict, depending on what the category is then used to decide.

Estimates, not measurements

A second source of disagreement is quieter. Most calculators do not ask for your true one-rep max; they estimate it from a set of several reps using a formula.

Different formulas give different estimates for the same set, and the disagreement grows as the rep count rises. A set of three produces fairly consistent estimates across formulas. A set of twelve does not. So two calculators can disagree about you before they have even consulted their tables.

Bodyweight scaling is a choice

Standards scale with bodyweight, since a 100 kg lift means more at 65 kg than at 110 kg. But how they scale is a modelling decision. Some divide simply by bodyweight. Others use formulas that deliberately give lighter lifters more credit, on the grounds that strength does not rise in proportion to mass.

At the extremes of bodyweight this choice alone can move you a full category.

Strict on purpose

WhyRep's own thresholds are an example of the third kind, and they are set stricter than most public calculators for men. That is intentional. The category there is not a badge; it decides how many sessions without progress should pass before a stall gets flagged. A generous category buys a lifter extra weeks of stalling before anyone mentions it, so erring strict is the useful direction.

The consequence is that you will probably rank lower there than on a site built to describe a population or to encourage you. Neither answer is more correct. They are doing different jobs.

What to do with conflicting results

Stop looking for the true category, because there is not one. Ask two better questions instead.

What was this calculator built to do? Describe a user base, describe competitors, or drive a decision. That tells you which direction it is likely to lean.

Does it say how its thresholds were chosen? A standard that explains its comparison group and its purpose is one you can interpret. A standard that just hands you a label is one you can only argue with.

And if the category is not being used to decide anything, it is worth very little either way. Your own numbers over time will tell you more than any comparison with strangers.

Common questions

Why do strength standards differ between websites?

Because they are built from different populations and serve different purposes. A standard built from user-submitted lifts describes people who use that site, a standard built for competitive lifters describes competitors, and a standard built to trigger training decisions may be set deliberately strict.

Which strength standards calculator is most accurate?

None of them is accurate in the sense of being a single true answer. The useful question is which one was built for a purpose close to yours, and whether it tells you how its thresholds were chosen.

Are user-submitted strength standards reliable?

They are biased in a predictable direction. People who log and submit their lifts tend to be more committed than average, and people are more likely to report a strong lift than a weak one, which pushes the distribution up.

Does it matter which category I am in?

Only if the category is used for something. As a label it means little. When it decides something practical, such as how quickly a stall should be flagged, the choice of threshold has real consequences.