What is the One Rep Max Calculator?
Your one rep max (1RM) is the heaviest weight you can lift once. Testing it directly is risky, so it's estimated from a lighter weight lifted for several reps.
How to use it
- 1
Enter weight and reps
From a recent hard set.
- 2
Read your 1RM
And the training loads.
Features
Two formulas
Epley and Brzycki, averaged.
kg or lb
Rounded to plates you can load.
Training chart
Weights for 60–100% of your max.
Popular uses
Strength programmes
Set weights by percentage.
Progress tracking
Watch your max grow safely.
Frequently asked questions
How many reps should I use?
Sets of 3–10 reps give the most reliable estimates.
Is it safe to test a real max?
Only with a proper warm-up and a spotter.