What is estimated 1RM (e1RM), and why track it?
Your one-rep max (1RM) is the most you can lift once. Estimated 1RM works it out from a set of several reps, so you can see strength progress without ever testing a max.
The formula
MaxLift uses the Epley formula: e1RM = weight × (1 + reps ÷ 30). For example, 100 kg for 6 reps gives 100 × 1.2 = 120 kg.
Why it’s useful
Your sets change from week to week: 100 kg for 6 one week, 105 kg for 4 the next. Which was better? The estimate puts both on one scale (120 kg vs 119 kg), so the Progress chart can show a single line for each lift.
How accurate is it?
It’s most accurate for sets of about 2–10 reps. Very high-rep sets overestimate a little, and it varies from person to person. Treat it as a trend line, not a promise of what you’ll lift today.
Where MaxLift uses it
- Progress: the chart and the “best e1RM” for each exercise.
- Weeks: the ▲▼ change against last time.
- Log: suggested weights. Your best set last time gives an estimated max, and from that the weight you should manage for today’s target reps.