UK to US Women's Clothing Size Conversion

For UK to US women's size conversion, a UK size 10 usually matches a US size 6, so the UK number is generally four higher. This is a rule of thumb, not a standard, because every brand cuts its clothing sizes a little differently.

This guide shows a published chart, explains why conversions drift, and gives store owners a way to stop shoppers guessing. For stores, AI size recommendation for fashion stores is the longer-term fix. Shoppers can use the table and the checks below.

What is the UK to US women's size conversion?

The table below comes from Primark's UK women's size chart, which lists UK/Ireland, EU and US sizes side by side (checked November 2026, Primark size charts). It is an example chart from one retailer. Check your own brand's chart before you order or publish.

Size	UK/IRL	EU	US
2XS	4/6	32/34	0/2
XS	6/8	34/36	2/4
S	10/12	38/40	6/8
M	12/14	40/42	8/10
L	14/16	42/44	10/12
XL	18/20	46/48	14/16
2XL	22/24	50/52	18/20
3XL	26/28	54/56	22/24

Source: Primark, UK women's size chart.

Read each row as a pair. In the S row, UK 10 lines up with US 6, and UK 12 with US 8.

How do you convert a UK dress size to US quickly?

Use the table first. For a quick estimate, subtract four from the UK number to get the US number. UK 12 becomes US 8, and UK 14 becomes US 10.

The shortcut matches the Primark rows above, but Primark's page also warns that the conversion "can vary slightly depending on the brand" and that fit may vary by style, cut and fabric. Treat the result as a starting point and then check the garment's own measurements.

Why do UK and US sizes not always match?

Primark's own page says fit varies by style, cut and fabric. A few things can cause the gaps:

• Cut and fabric. A stretch knit and a woven dress at the same label fit differently.
• Brand targets. A brand aimed at a younger customer may cut a different shape from a workwear label.
• Rounded pairs. Charts often give two numbers per size, like 10/12, which hides the gap between them.

That is why a conversion is a guess and a measurement is not.

How should shoppers check the fit before they order?

Follow these steps:

1. Measure your bust, waist and hips with a soft tape.
2. Open the brand's own size chart, not a generic converter.
3. Match each of your measurements to the chart's ranges.
4. If you fall between two sizes, read the fit notes and the reviews.
5. Check the return policy before you order.

The brand's chart in body measurements beats any UK to US shortcut. If you need help measuring, use a guide to taking measurements at home.

How can a store stop shoppers from converting sizes themselves?

Show sizes in the shopper's own system and let your chart do the work. A store that sells to the US and UK can list both labels, such as "UK 10 / US 6", as an example of clear labeling.

A size recommendation tool goes further. With ZeDaq.ai, the shopper uploads one photo and types their height, and the scan matches their measurements to your own size chart. Merchants add one chart per garment type (tops, outerwear, dresses and bottoms). If you have no chart for a garment type, the shopper gets a recommendation from a generic UK/US/EU/AU chart.

What does a worked example look like?

A shopper in the US wears a US 8 and finds a UK brand's dress. They add four and look for a UK 12.

Then they open the brand's chart and compare their bust, waist and hips with the UK 12 row. If the hips fall outside the range, they go up a size or read the fit notes. The conversion gave them a place to start, and the measurements gave the answer.

Store owners can do the same work for the shopper by showing both labels and the body measurements for each size.

What about sizes from other regions?

Conversions get harder across regions. If your customers also shop from Europe or Asia, compare the charts in EU to US women's size conversion and Asian to US clothing size conversion. Labels differ by region, so measure instead of assuming.

Brands that sell in West Africa can also look at Nigerian clothing sizes vs UK sizes for a local view.

FAQs

Is a UK 10 a US 6 or a US 8?

The Primark chart above pairs UK 10 with US 6. Other brands can differ, so check the brand's own chart.

Is UK sizing bigger than US sizing?

The UK number is higher for the same body, by four in the Primark chart above. That does not mean UK clothes are cut bigger.

Do UK and US sizes use the same measurements?

Not exactly. Each brand sets its own measurements for each size, which is why charts differ.

What should I do if I am between sizes?

Use your measurements and read the fit notes. If the garment is fitted and you are unsure, many shoppers choose the larger size, but check the return policy first.