One-rep max calculator
Estimate your 1RM from a set you’ve done, and see your training weights. Free, nothing leaves your browser.
Your one-rep max
—estimated 1RM
Enter a weight and how many reps you did (1 to 12).
Fabee helps you eat for your training, by chat.
DownloadAn estimate, not a reason to test a true max without a spotter. New to lifting, injured or with a heart condition? Ask a professional first.
How it works
Your 1RM is the most you could lift once. It’s estimated from a heavier set with two classic formulas, Epley (weight × (1 + reps ÷ 30)) and Brzycki (weight × 36 ÷ (37 − reps)), averaged.
The table gives training weights by percentage, rounded to the nearest 2.5 kg or 5 lb, with roughly how many reps each allows.