Performance Calculator
1RM Predictor
One-Rep Max · Epley Formula · Training Zones
Select LiftEstimated One-Rep Max
—kg
—
Key Training Zones
—
60%
15–20 reps
—
75%
8–12 reps
—
85%
4–6 reps
% of 1RM
Weight
Rep Range
50%—20+ reps
60%—15–20 reps
70%—12–15 reps
75%—8–12 reps
80%—6–8 reps
85%—4–6 reps
90%—2–4 reps
95%—1–2 reps
100%—1 rep max
⚠ Based on the Epley formula. Use as a programming guide only — never attempt a true 1RM without a spotter and thorough warm-up. Always prioritise form over load.