Head-to-Body Ratio — Heads Tall, Canon and Measured
The oldest proportion in figure drawing, and the one most often quoted without a source. Here is the formula, the canon, and what body scans actually show.
What the number means
“Heads tall” is your height divided by your head height. A 170 cm person with a 23 cm head is 170 ÷ 23 = 7.39 heads tall. The head-to-body ratio is the reciprocal: 23 ÷ 170 = 0.135, or 13.5% of height. The calculator shows both because articles and drawing books use both phrasings.
head-to-body ratio = head height ÷ height
How to measure head height
- Stand or sit upright, looking straight ahead, without tilting the chin up or down.
- Find the crown of the head — the bony top, not the top of the hair.
- Measure from the crown to the bottom of the chin.
- Do not include the neck. The chin is the lower landmark.
A soft tape or a ruler against a wall both work. If you are measuring yourself, use a mirror or a second person; the crown is easy to miss by a centimetre, and a centimetre changes the result by about 0.3 heads.
Canon vs measured
| Reference | Heads tall | What it is |
|---|---|---|
| Naturalistic adult | ~7.5 | Artistic convention used in many realist schools |
| Classical ideal | 8.0 | Artistic canon for dignity and grandeur |
| Heroic | 8.5 | Artistic canon for gods and superheroes |
| Measured men (2020) | ~7.1 | US Air Force body-scan sample; head height 0.14 of stature |
| Measured women (2020) | ~6.7 | US Air Force body-scan sample; head height 0.15 of stature |
The 2020 re-analysis of Leonardo’s Vitruvian Man used 63,623 men and 1,385 women. The measured means are lower than the 7.5-head convention because the convention is a drawing target, not a population statistic. Neither number is “more correct”; they answer different questions.
Use in figure drawing
In the eight-head canon, the first head ends at the chin, the second around the nipples, the third at the navel, and the fourth at the crotch. The legs are about four heads. That gives a simple scaffold for a standing figure: mark the head units first, then place the landmarks.
For a naturalistic figure, start at 7.5 heads. For an idealised or heroic figure, move to 8 or 8.5. The extra length usually comes from the legs and chest, not from a larger head. The drawing guide has the landmark table and a printable sheet.
Use in clothing fit
Heads tall is a frame proportion, not a garment measurement. It can help you judge whether a cropped jacket or a long coat will read as intended, but it will not tell you a size. For fit, waist-to-hip, shoulder-to-waist and leg-to-height are more directly useful.
Limits
- Head height is a definition: crown to chin, no hair. A different definition changes the result.
- The measured means come from a US military sample, not a global average.
- The 7.5/8/8.5 canon is an artistic choice, not a health or attractiveness standard.
- A single number does not describe a body; use it with the other ratios.
Questions
Is “heads tall” the same as “head-to-body ratio”?
They are reciprocals. Heads tall = height ÷ head height. Head-to-body ratio = head height ÷ height. A 7.4-head figure has a head-to-body ratio of about 0.135, or 13.5%.
Should I include hair when measuring head height?
No. Measure from the crown of the head to the chin with the hair flattened, or use a mirror to find the bony top of the head. Hair volume can add a centimetre or more and change the result.
Why do measured adults come out under 7.5 heads?
Because 7.5 is an artistic convention, not a population average. In a 2020 re-analysis of US Air Force scans, mean head height was 0.14 of stature for men and 0.15 for women — about 7.1 and 6.7 heads tall.
Sources
- Revisiting Vitruvian Man (2020). Revisiting Leonardo da Vinci’s Vitruvian Man Using Contemporary Measurements. PMC7284298 (2020). https://pmc.ncbi.nlm.nih.gov/articles/PMC7284298/ 63,623 men and 1,385 women from US Air Force body-scan data. Head height 0.14/0.15 of stature; arm span 0.96/0.92; shoulder width 0.24/0.25.
- Artists Network: 7.5-head figure. Artists Network. Drawing the Proportions of the Human Body. Ameral, 2010. https://www.artistsnetwork.com/art-techniques/drawing-proportions-human-body-ameral/ A 7.5-head figure is the standard used in many realist schools; most adults are about 7–7.5 heads.
- Practical Drawing: the eight-head canon. Practical Drawing, Chapter 2 (Wikisource). The classical canon of eight heads and its use in idealised figures. https://en.wikisource.org/wiki/Practical_Drawing/Chapter_2 The eight-head canon is an artistic convention for dignity and grandeur, not a population average.