YOUR LIFT
Calculate your one-rep max
Enter the weight you lifted and the number of clean reps you completed.
An estimate for training, not a tested maximum.
Training weights
| Intensity | Target weight | What it means |
|---|
Percentage weights are based on the Epley estimate and are rounded to one decimal. They aren't personalized prescriptions.
POPULAR EXERCISES
Pick your next lift
UNDERSTAND YOUR RESULT
What is a one-rep max?
Your one-repetition maximum (1RM) is the greatest weight you can lift once with proper form for a particular exercise. You can estimate it without attempting a heavy single: enter the weight and reps from a challenging set.
Our default estimate uses the Epley formula. We also show the Brzycki estimate so you can see that there isn't one exact formula for every lifter. The estimates become less dependable as repetitions rise, especially if the set wasn't close to your actual limit.
How accurate is a 1RM calculator?
It's a useful starting point for planning, not a guarantee of what you can lift. Rep technique, training experience, fatigue, equipment, and proximity to failure all matter. Use a recent, consistent set, ideally around 3–6 hard repetitions, and never treat the result as a reason to attempt an unsafe maximum.