One-Rep Max Calculator
Calculate your one-rep maximum (1RM) for any exercise. Compare different formulas, estimate weights for different rep ranges, and track your strength progress.
Step 1: Lift Details
About One-Rep Max
Your one-rep max (1RM) is the maximum amount of weight you can lift for one repetition of a given exercise. It’s a key metric for measuring strength and planning training programs.
Step 2: Calculation Options
About 1RM Formulas
Different formulas estimate 1RM based on submaximal lifts. Epley is most common, Brzycki is more conservative for higher reps, Lombardi works well for power exercises.
One-Rep Max Results
Your Estimated One-Rep Maximum
1RM Formula Comparison
| Formula | Estimated 1RM | Difference | Best For |
|---|
Estimated Weights for Different Rep Ranges
1RM Formulas Explained
Epley: 1RM = w × (1 + r/30) | Brzycki: 1RM = w × (36 / (37 – r))
Where w = weight lifted, r = reps performed. Different formulas produce slightly different estimates. Epley is most popular for general strength training.
Need Personalized Training Guidance?
Connect with our certified strength coaches for personalized programming, technique analysis, and strength progression planning.
Get Coaching Advice