Free tool · Tape measure
Two tape measurements, one number: your shoulder circumference divided by your waist. It works out in your browser, and nothing you type leaves this page.
For ages 16 and up. General guidance, not medical advice.
Around the widest point of your shoulders, arms relaxed by your sides, level all the way round.
At belly-button height. Breathe out normally; relaxed, not sucked in. Snug, not tight.
Your shoulder-to-waist ratio
Enter both measurements to see your ratio.
Shoulder circumference divided by waist circumference, both measured around the body with a tape. Same units on both, so the units cancel out.
The taper ratio in the app compares widths, shoulders to waist, measured from your photos. Widths and circumferences give different numbers, so don't compare the two.
The V-Taper Score comes from the app's scan, by a fixed formula across your zones. Two tape numbers can't stand in for it, so this page doesn't make one.
How the score worksMany calculators grade you against the "golden ratio" as the ideal V-taper. It's a convention from maths and art, with no evidence behind it as a target for bodies. We don't grade you against it, or against anything.
For adults, mostly the waist. Shoulder bone doesn't change, and delts add millimetres per cycle. If you're 16 or 17, the app sets no calorie deficit and shows no projections.
The same steps the app uses. A tape that slips or a held breath often throws the number off.
Stand relaxed, arms by your sides. Your partner wraps the tape around the widest point of your shoulders, level all the way round.
Hold the tape end on your chest, loop it behind you over the widest point of your shoulders, and check in a mirror that it sits level.
Stand relaxed and breathe out normally. Your partner wraps the tape around your waist at belly-button height, level and snug, not tight.
Breathe out normally. Wrap the tape around your waist at belly-button height, check in a mirror that it's level, snug but not tight.
Save your tape numbers with each weekly scan, next to the photo estimates. Your plan uses the tape number where you have one.
Coming soon to the App Store
iPhone · Ages 16+ · Scores are an AI estimate, not medical advice.
VTaper Max is for ages 16 and up. If you're under 18, a parent or guardian should know you're using it.