Clothing Size Calculator
Quick answer: a clothing size calculator turns three body measurements — chest (or bust), waist, and hips — into a size. PhotoFit does it from a single photo: your browser estimates the measurements, then matches them against brand size charts. No tape measure, no upload, no account.
Open the calculatorMost people get their size wrong not because they do not know their measurements, but because they only know one brand’s size. A size M in Nike is not a size M in Uniqlo, and a size 8 in the US is not a size 8 in the UK. The calculator gives you the raw numbers first; the chart does the translation.
How the calculator works
- Take or upload a photo. Stand straight, arms slightly away from your body, phone at chest height, one to two metres away, full body in frame.
- Let the model find your landmarks. Pose detection runs locally in your browser (TensorFlow.js). It locates shoulders, chest, waist and hips, then converts pixel distances to centimetres using your height as the scale reference.
- Read your numbers. Compare them to the brand size charts — or enter them on a chart page and let it pick the closest size.
The whole flow takes under a minute once you have a photo that is not cropped at the shoulders or ankles.
Before you shoot: three things that change the result
- Wear fitted clothing. A hoodie adds 3–5 cm to your chest reading. Leggings and a fitted tee give the cleanest result.
- Stand naturally, do not suck in. The calculator is estimating the body you will actually wear the clothes on.
- Use your real height. It is the scale reference. Being 5 cm off on height throws every measurement off by roughly the same proportion.
Your measurements, converted to a size
These are typical US retail ranges. Use them as a starting point, then check the brand’s own chart — the whole point of the size chart library is that these ranges drift. The same tables, without the calculator, are in the clothing size chart.
Men’s tops (chest)
| Size | Chest (in) | Chest (cm) |
|---|---|---|
| XS | 33–34 | 84–86 |
| S | 35–37 | 89–94 |
| M | 38–40 | 97–102 |
| L | 42–44 | 107–112 |
| XL | 46–48 | 117–122 |
| 2XL | 50–52 | 127–132 |
Women’s tops (bust / waist / hip)
| Size | Bust (in) | Waist (in) | Hip (in) |
|---|---|---|---|
| XS | 31.5–32.5 | 24–25 | 34.5–35.5 |
| S | 33.5–34.5 | 26–27 | 36.5–37.5 |
| M | 35.5–36.5 | 28–29 | 38.5–39.5 |
| L | 38–39.5 | 30.5–32 | 41–42.5 |
| XL | 41–43 | 33.5–35.5 | 43.5–45.5 |
If your numbers land in two rows you are between sizes — which is normal, and the next section is for you.
From measurements to brand size
A calculator gives you measurements. A brand chart decides what to call them. Three examples from charts people actually search for:
- Nike men’s tops run true to size but cut athletic through the chest — if your chest is at the top of the M range, the L is usually the safer buy. Full table: Nike men’s tops size chart.
- Uniqlo is built on Japanese sizing, which runs roughly one size smaller than US retail for men. A US M is often a Uniqlo L.
- Carhartt is cut for layering: relaxed through the body, longer in the sleeve. Most people can size down from their US retail size for a fitted look.
That is why “what size am I” has no single answer. The honest answer is a range, and the calculator’s output should be read as your measurements first, size second.
The three measurement points, precisely
- Chest / bust — around the fullest part, tape parallel to the floor, arms down. For women, go over the bust apex, not under it.
- Waist — the narrowest point of the torso, usually just above the navel. Keep one finger under the tape; a cinched waist reading is the most common measuring mistake.
- Hips — the widest point, usually 20 cm below the waist, feet together.
Shoulder width matters more than chest for jackets and overshirts, and it is the one number a photo estimates least reliably — if you are buying a structured jacket, check the brand’s shoulder measurement against a jacket you already own. The step-by-step measuring guide covers the same points with a tape.
What the calculator can and cannot do
It can get you within roughly ±2–3 cm on chest, waist and hips in good lighting with fitted clothing — enough to pick between two candidate sizes, which is the decision that actually matters.
It cannot measure inseam reliably from a standing photo, replace a tailor for a suit, or account for a specific garment’s cut. For those, the garment’s own measurement chart beats any body calculator. Treat it as a filter, not an oracle: it narrows thirty candidate sizes to two, and the brand chart finishes the job.
Privacy
Most “AI body scan” apps upload your photo to a server. PhotoFit’s free scan does not: the pose model runs in your browser and the image never leaves your device. There is no upload endpoint involved, nothing stored, and nothing to delete afterwards. The optional paid upgrade is disclosed in the privacy policy.
Frequently asked questions
What is a clothing size calculator?
A tool that converts body measurements into a clothing size. It measures chest or bust, waist and hips, then compares them to standard or brand-specific size charts.
Can I find my clothing size from a photo?
Yes, within a few centimetres. Pose detection estimates your proportions from the image and scales them using your height. It works best with a full-body photo, fitted clothing and even lighting.
How accurate is photo-based body measurement?
Roughly plus or minus 2 to 3 centimetres on chest, waist and hips under good conditions. That is enough to choose between two sizes, not enough to replace a tailor’s tape for a made-to-measure garment.
Is my photo uploaded anywhere?
The free scan runs in your browser with TensorFlow.js, so the image is never sent to our servers. The optional paid AI Enhanced upgrade is the one exception and is disclosed in the privacy policy.
What if I am between sizes?
Size up for tops and outerwear, size to your waist for jeans, and check the brand’s fit notes. Some brands, especially those built on Japanese sizing such as Uniqlo, run a full size small.
Does the calculator work for UK and EU sizes?
The calculator outputs measurements in centimetres and inches; the size label depends on the chart. Our US to UK, EU and Japan conversion guide covers the label side.
Start with your measurements
You need three numbers, not thirty size labels. Take a photo and get your measurements — then open the chart for the brand you are buying and match them.