Weights Tools

1RM Estimation

Use this section to indirectly estimate your One-repetition maximum (one-rep max or 1RM) using repetition testing on submaximal loads. Because testing for 1RM is very arduous on the nervous system, and because of the heavy loads involved, it can be dangerous to do a true 1RM assessment, especially for newer lifters. Because of this, using submaximal loads such as 3RM or 5RM and then converting that load to 1RM is safer, although less accurate. It's not recommended to estimate the 1RM based on more than five repetitions as the estimation gets less and less accurate with increasing amount of repetitions.

The calculator below uses two popular formulas for estimating 1RM : Epley's and Brzyscki's. According to Wikipedia, Epley and Brzycki return identical results for 10 repetitions. However, for fewer than 10 reps, Epley returns a slightly higher estimated maximum.

Load Percentages

Use this section to quickly convert your One Repetition Max (1RM) to various load percentages.

Load Chart

This chart outlines %1RM ranges corresponding to maximum repetition ranges (to concentric failure), providing a tool for resistance training program design and load prescription based on training goals like strength (1-6 reps, 85%+ 1RM) or hypertrophy (6-12 reps, 70-85% 1RM). These ranges derive from empirical data on compound lifts, where loads like 75% 1RM typically yield 10 reps to failure, though individual variability (±20-30%) arises from training status, exercise type, and fatigue. Adapted from the NSCA's Training Load Chart (Landers, 1984) and Essentials of Strength Training & Conditioning, the values reflect established guidelines for progressive overload and injury prevention.

Max Reps %1RM Primary Goal
1-2 95-100% Maximal Strength
3-5 87-93% Strength, Power
6-10 75-85% Strength, Hypertrophy
10-12 70-75% Hypertrophy, Muscular Endurance
12+ <70% Muscular Endurance, Pump Work

Sources:

Strength-to-Weight Ratio Standards (1RM Multiples of Bodyweight, Male)

These strength-to-weight ratios represent approximate 1RM performance relative to bodyweight for adult males across major compound lifts. Levels are defined as: Beginner (<6 months consistent training), Intermediate (1-2 years), Advanced (2-5 years), Elite (>5 years or competitive).

Female equivalents typically range from 60-80% of male ratios for equivalent proficiency levels[1][2].

Lift Beginner Intermediate Advanced Elite
Bench Press 0.5-0.75× BW 1.0-1.25× BW 1.25-1.5× BW 1.5-2.25× BW
Squat 0.75-1.0× BW 1.25-1.5× BW 1.5-2.0× BW 2.0-3.0× BW
Deadlift 1.25-1.5× BW 1.75-2.0× BW 2.25-2.75× BW 3.0+× BW
Overhead Press 0.4-0.6× BW 0.7-0.9× BW 0.9-1.1× BW 1.1+× BW

Sources