Body proportion calculator
Put two lines on a picture and read how many times one fits into the other. Head to body, 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.
Auto-place is optional. The first press downloads a recognition model, then the points land on the figure; the ones it cannot find — the waist, for instance — stay where they are for you to place. The ruler reads the same without it.
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, around 0.5 for long legs.
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.
Frequently asked questions
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.
Does auto-place send my photo anywhere?
What gets downloaded is the recognition model. The recognition itself runs on your own device, so your photo stays in the browser exactly as it does without auto-place.
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?
The proportions of a generated image 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.