One Rep Max Calculator
Precision Strength Analysis & Training Planning
Estimated One Rep Maximum
0 KG
Based on Advanced Hybrid Formula (Epley, Brzycki, Lombardi, Mayhew)
Epley Formula
-Brzycki Formula
-Lombardi Formula
-Training Weight (80%)
-Percentage Breakdown & Training Zones
| % of 1RM | Weight | Reps (Est.) | Training Zone |
|---|
Calculation History
What is a One Rep Max Calculator?
A One Rep Max Calculator (1RM) is an essential tool for weightlifters, bodybuilders, and powerlifters. It estimates the maximum amount of weight you can lift for a single repetition of a given exercise, such as the Bench Press, Squat, or Deadlift. Knowing your 1RM is crucial for designing effective training programs based on percentage-based training.
Why Use This 1RM Calculator?
Testing your true one-rep max in the gym can be dangerous and taxing on the central nervous system. This calculator allows you to estimate your max safely by using a sub-maximal weight for multiple repetitions. Our tool helps you:
- Determine accurate training loads for Hypertrophy (Muscle Growth) and Strength.
- Track progress over time without testing failure every session.
- Prevent injury by avoiding heavy 1RM attempts too frequently.
Formulas Used for Accuracy
This Advanced One Rep Max Calculator combines four of the most scientifically validated formulas to provide the most accurate estimate possible:
- Epley Formula: Highly accurate for rep ranges between 6-10.
- Brzycki Formula: Widely used standard for general strength estimation.
- Lombardi & Mayhew: Additional algorithms to refine accuracy for different lifters.