Heavy Strength
1RM Calculator Estimate Your One Rep Max Instantly
Enter the weight of your equipment and your total body weight to discover your one-rep max & the optimized volume needed for maximum muscle growth.
Your Strength Level
Advanced
Estimated 1RM
120 LBS
1RM Training Weights
% of 1RM
Weight
Use Case
Reps
100%
165
Max Strength/ 1RM
1 Rep
90%
149
2–3 Reps
80%
132
Strength & Muscle Growth
5–8 Reps
70%
116
Muscle Growth
8–12 Reps
60%
99
Endurance / Warm-Up
15+ Reps
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What is a One-Rep Max?
A 1RM (One-Rep Max) is an estimate of the maximum weight you could lift for one repetition.Instead of testing a risky all-out lift, this calculator uses your performance at lighter weights to estimate your potential maximum.
How to Use the Strength Level Calculator
Calculate your strength level in under 30 seconds
01
Enter the weight you lifted and the number of reps performed.
02
Add your bodyweight to estimate your one-rep max (1RM).
03
Instantly see your strength level based on proven standards.
Strength Level Standards
Compare your strength to real lifting benchmarks
Strength levels are determined by how much you lift relative to your bodyweight. These standards help you understand where you stand compared to other lifters.
Entry
New to structured strength training
Core
Developing consistent strength
Prime
Stronger than most gym-goers
Elite
Top percentage of recreational lifters
Apex
Competitive or near-competitive level
The Math Behind Your Strength Level
This calculator estimates your one-rep max (1RM) using proven formulas widely used in strength training.
Epley Formula
1RM = Weight × (1 + Reps / 30)
Brzycki Formula
1RM = Weight × 36 / (37 − Reps)
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