everyday-health Verified Precision Tool
One Rep Max (1RM) Calculator
Estimate your 1RM maximum lift weight using Epley, Brzycki, and Lander formulas.
Mathematical Formula
Epley 1RM = Weight * (1 + Reps / 30)
Overview & Explanation
One Rep Max estimators project the maximum load a lifter can move for one rep based on multi-rep sets.
How It Works
- Evaluates Epley and Brzycki strength equations based on weight and reps.
Practical Applications
- Weightlifting training percentages.
- Safe strength progression.
100 kg for 5 reps
Calculate Epley 1RM.
1
Calculate rep multiplier
1 + (5 / 30)
= 1.1667
2
Multiply by weight lifted
100 * 1.1667
= 116.7 kg 1RM
Frequently Asked Questions
Which 1RM formula is best for high rep sets?
The Brzycki formula is generally preferred for sets between 2 to 10 repetitions.
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