Ideal body proportions calculator
Classical proportions scale every girth from the wrist, because wrist size tracks your skeletal frame and barely changes with training or fat. Measure as many parts as you like and see which ones are lagging behind the rest.
Ideal Body Proportions Calculator
The Grecian ideal sets a man's chest at 6.5 times wrist circumference, the waist at 70% of that chest, the flexed arm, neck and calf at 2.5 times the wrist, and the shoulders at 1.618 times the waist (the golden ratio). A 17.5 cm wrist gives an ideal chest of about 114 cm and a waist of about 80 cm. For women the common convention is an hourglass with bust equal to hips and a waist at 70% of the hips.
Narrowest point, just below the wrist bone. Every ideal is scaled from this.
Around both shoulders at the widest point, over the deltoids, arms relaxed.
At nipple level under the armpits; women at the fullest part of the bust.
Flex hard and measure around the peak of the upper arm.
Fist clenched, arm straight, at the widest part near the elbow.
Just below the Adam's apple, tape sloping slightly down at the front.
Narrowest point, relaxed after breathing out. Don't suck in.
Widest part of the hips and glutes, feet together.
Standing, at the widest point just below the glutes.
Standing with weight on both feet, at the widest point.
Optional. Adds the waist-to-height ratio.
Most lagging: arm (flexed) at 87%
Ratios
What to work on first
Method notes (2)
- Classic 'Grecian ideal' proportions (chest 6.5× wrist, waist 70% of chest, arm/neck/calf 2.5× wrist), plus McCallum's ratios for forearm/thigh/hips and the golden ratio for shoulders. An aesthetic reference that suits a lean, trained physique, not a health target.
- Measure the arm flexed at the peak, the waist at its narrowest point, hips and thighs at the widest, neck below the Adam's apple. Use the same tape and time of day each time, and remeasure every 8–12 weeks.
Metric or imperial · runs the same code as the app · nothing is sent anywhere
How it works
For men this uses the classical Grecian ideal: chest 6.5 × wrist, waist 70% of the ideal chest, and flexed arm, neck and calf each 2.5 × wrist. John McCallum's chest percentages fill in the rest — forearm 29%, thigh 53% and hips 85% of the ideal chest — and the shoulders are set at 1.618 × the ideal waist, the golden ratio.
There is no published wrist-based standard for women, so the women's ideal is a convention: the classic hourglass with bust equal to hips at 6.0 × wrist, a waist at 70% of the hips (Singh's 0.70 waist-to-hip ratio), golden-ratio shoulders, and limb targets taken from typical lean, trained women of the same frame.
Each measured part is scored as a percentage of its ideal. The waist is inverted, because smaller is better there, and capped at 100%. The proportion score is the mean of those percentages, each capped at 100, so one overdeveloped part cannot hide a lagging one.
Common questions
What is the ideal arm size for my wrist?
The Grecian ideal puts the flexed upper arm at 2.5 times wrist circumference, so a 17.5 cm wrist gives about 44 cm and a 16 cm wrist about 40 cm. Very few natural lifters pass that, so reaching 95% of it is already a well-developed arm.
What is the Adonis index?
Shoulder circumference divided by waist circumference. The golden ratio of 1.618 is the traditional ideal. Most untrained men sit near 1.3, and narrowing the waist raises the ratio as fast as building the shoulders does.
Are these proportions a health target?
No. They are an aesthetic convention from classical sculpture and old-school bodybuilding. The only health-related figures here are waist-to-hip and waist-to-height, where under 0.5 waist-to-height is the common guideline.
Why is everything based on the wrist?
The wrist is almost all bone and tendon, so it reflects skeletal frame size and does not change much as you gain muscle or fat. A bigger frame supports bigger girths, and scaling from the wrist keeps the targets realistic for your build.
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These numbers are more useful when something tracks them.
The app runs this same maths against your logged weigh-ins, meals and sessions, so the figure updates itself instead of being a one-off.
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