How the ranges are calculated
Every lift is read as a multiple of your clean & jerk: a front squat is usually about 1.2 times it, a snatch about 0.77. Each multiple has a spread, and both move with your strength and your age: a stronger lifter's squats sit closer to their clean & jerk, and with age the snatch drifts down against it.
eRM for other lifts
Each lift's range comes from your snatch and clean & jerk together. When the two disagree, for example a strong snatch with a weaker clean & jerk, the range widens by how much they disagree.
Competition lift ranges
The reverse: every other record you enter is divided by its multiple to give one estimate of your clean & jerk (or your snatch), and your other competition lift gives one more. The eRM is their mean, each weighted by how tight its multiple is: a front squat counts for more toward the clean & jerk, an overhead squat toward the snatch. The range spans the middle 80 % of the estimates, and never less than their combined spread. A record under 85 % of the low end of its own range is shown but not counted: it is more likely a light day than a max.
Age
The multiples are set at 35 and adjusted between 35 and 65, held at either end outside that. Without an age the page reads them at 35. The Typical multipliers page shows the same multiples at your age and at 35 side by side.
Questions
What is a good snatch to clean & jerk ratio?
About 0.77 at 35 for a 78 kg clean & jerk. It rises with strength, to about 0.81 for the strongest lifters, and falls with age. The Lift ratios page shows your own ratio against the usual range for your age and level.
What does "behind your other lifts" mean?
That competition lift is below the range your other records put it in. It is the lift with the most room: your strength already says it could be higher.
Why is my record "not counted"?
It is under 85 % of the low end of its usual range for your snatch and clean & jerk. A record that light is more likely an old or untested number than a max, and counting it would drag both competition ranges down. It still shows, greyed.
Is anything I type sent anywhere?
No. Everything is calculated in your browser, and your numbers are kept only in this browser, shared with the calculator. The privacy page says what the site counts.
Sources
- The Nosto range model: lift multiples by strength and age. Coaching convention, not measurement.
- Huebner, Meltzer and Perperoglou, 2019: age-related performance in masters weightlifting (the C&J read as a 35-year-old's).
- Czaplicki and colleagues: measured hang and power ratios (the start and catch rows).
The model is exported from the Nosto app, so the page and the app give the same numbers.