Body proportion calculator
Put two lines on a picture and read how many times one fits into the other. Head to body, head to shoulder, leg to body, shoulder to hip, waist to hip — all measured in your browser, with nothing uploaded.
Drop a photo here, or open one from your device.
How to use it
Open a photo, pick a proportion, and drag the ends into place — crown of the head, bottom of the chin, the feet. The number follows as you move.
Zoom in for accuracy, then use the arrow pad for the last pixels. One press moves a point by a single pixel of the original image.
What each proportion divides
Head to body is full height ÷ head height — the number behind “seven heads tall”. Leg to body is leg length ÷ full height; the photo preset starts near the hip joint and ends at the feet.
Head-to-shoulder width ratio is head width ÷ shoulder width. A reading of 0.40 means the head spans 40% of the shoulder width. Use a front-facing photo and place the head line across its widest visible outline.
Shoulder to hip and waist to hip run across the figure instead: shoulder width or waist width ÷ hip width. For anything else, free measure hands you both lines to place yourself.
The reading describes the picture
Hair, shoes, camera angle and framing all move the ends, so one person photographed twice can read differently. That makes the number best for comparing two pictures, rather than for settling anything about a person.
Body proportion reference data
A ratio becomes more useful when you know where its endpoints are. The studies below measured people directly; the ruler above measures their appearance in a photograph. Use the definitions alongside the numbers.
Japan: AIST young-adult sample, 1997–98
These are ratios of published mean dimensions, not averages of each person’s ratio. Head width is measured across the head; shoulder width is between the acromion landmarks. The female sample has 107 participants, with head measurements available for 106.
| Sex | Participants | Age (years) | Height ÷ head height | Head width ÷ bony shoulder width |
|---|---|---|---|---|
| Male | 110 | 19.1–27.1 | 7.137 | 0.408 |
| Female | 107 | 19.2–26 | 6.873 | 0.432 |
Male: 1705.8 ÷ 239.0 for heads tall, 161.8 ÷ 396.6 for head/shoulder width. Female: 1586.3 ÷ 230.8 and 155.7 ÷ 360.8. All source dimensions are in millimetres. These samples describe the people measured at that time.
United States: ANSUR II Army sample, 2010–12
Unweighted means calculated from individual measurements: 4,082 men and 1,986 women, including active-duty, Reserve and National Guard personnel. The four subgroup rows follow the original DODRace classification; “All groups” also includes the remaining categories. Military samples do not represent national civilian averages.
| Sample | Sex | Participants | Age (years) | Height ÷ head height | Head width ÷ bony shoulder width | (Height − sitting height) ÷ height | Shoulder width ÷ hip width | Waist width ÷ hip width |
|---|---|---|---|---|---|---|---|---|
| All groups | Male | 4082 | 17–58 | — | 0.372 | 0.477 | 1.479 | 0.943 |
| White | Male | 2817 | 18–58 | — | 0.371 | 0.475 | 1.467 | 0.947 |
| Black | Male | 642 | 18–57 | — | 0.367 | 0.491 | 1.518 | 0.920 |
| Hispanic | Male | 440 | 18–55 | — | 0.377 | 0.474 | 1.490 | 0.953 |
| Asian | Male | 117 | 17–53 | — | 0.390 | 0.465 | 1.500 | 0.921 |
| All groups | Female | 1986 | 17–58 | — | 0.405 | 0.474 | 1.276 | 0.847 |
| White | Female | 975 | 18–56 | — | 0.404 | 0.469 | 1.258 | 0.849 |
| Black | Female | 656 | 17–58 | — | 0.401 | 0.484 | 1.300 | 0.838 |
| Hispanic | Female | 239 | 18–56 | — | 0.413 | 0.469 | 1.275 | 0.857 |
| Asian | Female | 71 | 18–47 | — | 0.427 | 0.460 | 1.294 | 0.851 |
For each person we calculate headbreadth / biacromialbreadth, (stature − sittingheight) / stature, bideltoidbreadth / hipbreadth and waistbreadth / hipbreadth, then average within each group. Head/shoulder uses bony shoulder width; shoulder/hip uses the outer deltoid width. The leg measure is derived from sitting height, whereas the photo preset starts near the hip joint. Missing head-height data are left blank.
Fashion model measurements: published examples
Models1 lists the following measurements. They give a sense of individual fashion-model sizes, rather than an industry average or entry requirement. Chest, waist and hips are circumferences; they cannot be substituted for the widths measured in a photograph. Measurements checked on 21 September 2026.
| Model | Sex | Height (cm) | Bust / chest (cm) | Waist (cm) | Hips (cm) |
|---|---|---|---|---|---|
| Joy · Models1 | Female | 177 | 85 | 60 | 90 |
| Taka S · Models1 | Male | 188 | 100.5 | 79.5 | 102 |
Research behind the definitions
This review explains different ways to measure leg length and how body proportions vary with growth and living conditions. It provides context for comparing studies that use different landmarks.
This paper reports sitting-height/height means by age, sex and population group using NHANES III. Its age-specific tables help explain why one reference value cannot describe every stage of growth.
For a photo comparison, use a front-facing pose, a similar camera height and visible body contours. Hair, padded shoulders and loose clothing change the visible outline. A population mean describes a sample; the ruler leaves aesthetic judgement to you.
Frequently asked questions
How do I calculate head-to-shoulder width ratio?
Divide head width by shoulder width. Choose head-to-shoulder width ratio, then place one line across the head and the other across the shoulders. A head width of 160 pixels and shoulder width of 400 pixels gives 0.40, or 40%. Hair, clothing and camera angle affect the visible widths.
Where do the body proportion averages come from?
The reference tables cite the Japanese AIST anthropometric database and the US Army ANSUR II survey. Each table identifies its sample and measurement method. The model examples come from agency profiles. Bone landmarks, circumferences and photographed outlines measure different things, so compare their definitions as well as their values.
What does this tool measure?
It measures two lines you place on one picture and reports the second as a multiple of the first. Head to body is the common case: the head height is one line, the full height is the other, and the reading is how many heads tall the figure appears.
How do I measure head to body ratio in a photo?
Open the photo, choose head to body, then drag the top point to the crown of the head, the middle point to the bottom of the chin and the lower point to the feet. The reading updates as each point moves.
Where is my photo processed?
In your browser. The page reads the file on your own device and calculates the reading there, so the picture stays with you.
How many heads tall should a figure be?
The tool gives you the number and leaves the judgement to you. Drawing conventions, fashion illustration and photography each carry their own habits, and the comparison that tends to help is between two of your own pictures.
Can Truest Lens generate an image with a chosen head to body ratio?
When you pick a model, the figure follows that model, and adding a full-body photo to the model is what pins its proportions down. Without a model, the proportions come from the reference photo you supply: Truest Lens places your garment into that reference and keeps its framing, pose and figure, so a different reference is what changes the proportions.