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Relative strength divides the load by body weight, but simple division favours light lifters because muscle cross-section scales with the two-thirds power of mass rather than linearly. The allometric score, load divided by body weight to the power 0.667, corrects for that and is the fairer comparison across very different sizes.
Relative strength
relative = load / body weight
Allometric scaling
score = load / body weight^0.667
This is an estimate from population-average equations, not a medical or diagnostic assessment. Individual results vary with genetics, training history and technique. Seek advice from a qualified coach or clinician before making significant changes to training.
Because strength depends on muscle cross-sectional area, which scales as the square of length while mass scales as the cube - giving an exponent of 2/3.
Simple ratio for bodyweight movements like pull-ups, allometric scaling when comparing lifters of very different sizes.