Two-formula average
Computes Epley and Brzycki and shows the average.
Fitness Calculator
Calculateur 1RM — Estimez votre max sur une rép
Saisissez la charge soulevée et les répétitions pour estimer votre 1RM avec les formules Epley et Brzycki, avec un tableau de pourcentages.
1RM estimé (Moyenne)
91.7
Epley 93.3 · Brzycki 90
Pourcentages d'entraînement
100% · 1 ≈ reps91.7
95% · 2 ≈ reps87.1
90% · 4 ≈ reps82.5
85% · 6 ≈ reps77.9
80% · 8 ≈ reps73.3
75% · 10 ≈ reps68.8
70% · 12 ≈ reps64.2
60% · 16 ≈ reps55
What is the 1RM calculator?
Your one-rep max (1RM) is the most weight you can lift for a single rep. Testing a true max is risky, so it's safer to estimate it from a lighter set (weight × reps). This tool uses the two most common formulas — Epley and Brzycki — and shows the average plus a training-percentage table.
How to use
- 1 Enter the weight you just lifted.
- 2 Enter the reps you completed (1–20).
- 3 Read your estimated 1RM and target weights by percentage.
Highlights
Percentage table
Weights and approximate reps from 60% to 100%.
Unit-agnostic
Works in kg or lb — results match your input unit.
Questions fréquentes
Epley or Brzycki — which is right?+
Both are widely used. They agree at low reps (≤5) and diverge as reps rise, so the average is a sensible default.
How many reps stay accurate?+
Accuracy is best in the 1–10 rep range; error grows as reps increase.
Should I test a true 1RM?+
Not necessarily — estimation is recommended to avoid injury. If you do test, always use a spotter and safeties.
Related tools
Estimates only; your true 1RM varies with condition, lift, and technique. Attempt maxes with a spotter and safeties, and don't push through pain.