JD
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Flexed arms use Steve Reeves' own ratio, 252% of wrist circumference. If you also enter your pelvis measurement, chest and waist use his ratios too — 148% and 86% of pelvis. Without it, chest (≈ 6.5× wrist) and waist (≈ 4.5× wrist) fall back to this tool's own wrist-scaled estimate, as shoulders (≈ 8× wrist) and the reference upper-arm figure (2.7× wrist) always do. Those wrist-scaled multiples are bodybuilding symmetry folklore rather than Reeves or a classical Greek measurement system, and the tool labels which basis produced your numbers.
Optional body fat %: values below 10% nudge the arm and chest targets up, ramping in gradually to a maximum at 5% rather than jumping at a threshold.
Treat the output as a conversation starter about frame size and proportions — not a forecast of drug-free limits, strength, or health.
Wrist circumference drives arms and shoulders. Add your pelvismeasurement to get chest and waist from Reeves' own ratios instead of this tool's wrist-scaled estimate. Optional body fat % raises the arm and chest targets slightly, ramping in from 10% down to 5%.
Illustrative, not prescriptive. Arms use Reeves' 252% of wrist; shoulders are a wrist-scaled estimate. Chest and waist are wrist-scaled estimates — enter your pelvis measurement for Reeves' own ratios.
Wrist used: 17.5 cm
Arms (flexed)
44.1 cm
Chest
113.8 cm
Shoulders
140 cm
Waist
78.8 cm
Arm reference ceiling (2.7× wrist)
47.3 cm
Disclaimer: Theoretical proportion model only — not physiological maximums, body-composition analysis, or medical guidance.