Your estimated one-rep max (e1RM) is the weight you could probably lift once, worked backwards from a set you actually did. Ten reps at 40 kg implies more strength than ten reps at 30 kg — and also more than three reps at 40 kg. e1RM turns any set into a single comparable number.
It matters because it measures getting stronger rather than doing more. Total volume — weight × reps added up — climbs simply because you tacked on a fourth set, or a fifth exercise. e1RM only climbs when the weight goes up or the reps go up at the same weight.
Céim uses the Epley formula, one of the long-standing estimates:
e1RM = weight × (1 + reps ÷ 30)
A single rep is taken at face value — there's nothing to estimate. Each further rep adds about 3.3% to the estimate, so the more reps you grind out, the heavier the implied max.
| Reps | Multiplier | A 40 kg set implies |
|---|
Every completed set is converted, and the best result across that exercise's sets becomes its score for the session. The dashboard then plots one point per session, so the line shows that lift's progression over time.
"Lifts improving" counts how many exercises scored higher than they did in their previous session. A lift you've only logged once has nothing to compare against, so it sits out of that tally rather than counting as a win or a loss.
Bodyweight exercises use your bodyweight at the time plus any added plates, which is why a weigh-in on file makes those figures meaningful.
It's an estimate, and worth treating as one:
It drifts at high reps. Epley is dependable up to roughly ten reps. Past that it gets optimistic — a 20-rep set implies a 1.67× multiplier that few people could actually lift.
It doesn't compare across exercises. A 97 kg back extension isn't "stronger" than a 69 kg pec fly — different movements, different leverage, different muscles. Machines also differ between manufacturers, and the number on the stack isn't always the load at your hands. Compare a lift only against itself.
It assumes honest reps. Half-reps and heavy momentum inflate it. The formula can't see your form.
None of which stops it being the best single indicator of strength progression you can get without actually testing a true max — which is hard on the body and rarely worth doing often.
The dashboard's Gym card shows your best e1RM on record, how many lifts are improving, and a progression chart for any lift you pick.