1RM calculator
Estimate your one-rep max from a set you have already done.
kg
Estimated one-rep max
90kg
| Reps | Weight |
|---|---|
| 2 | 87.5 kg |
| 3 | 85 kg |
| 5 | 80 kg |
| 8 | 72.5 kg |
| 10 | 67.5 kg |
How it works
Uses the Brzycki formula, the same one VitalityHub uses for the strength progress in your training: 1RM = weight ÷ (1.0278 − 0.0278 × reps). The estimate is reliable for sets of up to 10 reps, a rough guide up to 15, and above 15 reps no maximum can be estimated. The table shows what that max suggests for other rep counts, rounded to 2.5 kg. Note: VitalityHub recommends steering intensity by how many reps you could still do (e.g. submaximal = 2–3 reps left), not by % of 1RM, and does not recommend a real 1RM test for fitness and health training. Use this as an estimate only.