OneRepMax vs The Body Index

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

OneRepMax compared with The Body Index
Detail	OneRepMax	The Body Index
What it does	Free one rep max calculator with seven formulas and percentage charts	Free body-metric calculators with no accounts or ads in results
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Free	Free
Pricing	Not given	Not given
Key features	Seven 1RM formulas (Epley, Brzycki, Lombardi, Lander, Mayhew, O'Conner, Wathen) Average of all formulas as recommended result Percentage chart from 100% to 50% of 1RM Rep-max table for 1RM through 12RM Support for kilograms and pounds Exercise-specific formula defaults RPE adjustment for reps in reserve Multiple exercise categories (chest, back, legs, shoulders, arms, Olympic) Browser-based history with no account Warm-up sets calculator and rep-max table	Open source formulas on GitHub
What makes it different	Uses seven published formulas instead of one, showing average and range for transparency No account, sign-up, or data storage required Covers dozens of exercises with exercise-specific guidance and lift variations Warns about formula accuracy limits and when estimates are unreliable Includes linked tools for related calculations (DOTS, Wilks, training max, FFMI, VO2)	Calculators for metrics beyond BMI that major sites haven't adopted Open source formulas validated against peer-reviewed research papers All code available under MIT license for verification and reuse Free embeddable widgets with attribution for other websites
Community votes	0	0
DR (Domain Rating by Ahrefs)	Not checked yet no change since last check	Not checked yet no change since last check
Trust Flow (Majestic)	0	0
Citation Flow (Majestic)	0	0
Referring domains (Majestic)	0	0

4 details filled in for both companies.

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