Clothing Size Converter

Clothing Size Conversion Guide — UK to US, EU, AUS and Beyond

International clothing size conversion is one of the most confusing aspects of online shopping. Unlike weight, currency or distance, there is no universal standard for garment sizing — each country, and often each brand within a country, uses its own sizing conventions. Understanding how clothing sizes translate between the UK, US, EU, Australian, Italian and French systems can save you from the frustration and cost of returning ill-fitting purchases.

How UK and US women's clothing sizes compare

UK and US women's clothing sizes use the same numeric format but differ by exactly 4 numbers. A UK size 8 is a US size 4, a UK size 12 is a US size 8, and a UK size 16 is a US size 12. This offset is consistent across the full size range, making conversion straightforward once you know the formula. The underlying body measurements are the same — the difference is purely a labelling convention. For men's clothing, the discrepancy is less systematic: shirt sizes are typically expressed as chest measurement in inches in both regions, so a 40-inch chest is the same in both the UK and US. Trouser sizes in both regions use waist and inseam measurements in inches, though the interpretation can vary slightly between brands.

How European (EU) sizes work

European clothing sizes are approximately 28–32 numbers higher than their UK equivalents. A UK 8 equals approximately EU 36, a UK 12 is EU 40, and a UK 16 is EU 44. EU sizes are derived from chest or waist measurements in centimetres — the size number is roughly the chest measurement divided by 2, plus a constant. This means EU sizes are more directly tied to the body measurement than UK or US label sizes, which are purely arbitrary numbers. However, EU sizing is not fully standardised either — German, French, Italian and Scandinavian brands each have slightly different interpretations of what a given EU size represents in practice. French (FR) sizes are the same as EU sizes for women's clothing. Italian (IT) sizes are typically 4 numbers higher than UK sizes, so a UK 12 is approximately IT 44.

Australian clothing sizes explained

Australian women's clothing sizes are numerically the same as UK sizes — a UK 12 is an AUS 12, and a UK 16 is an AUS 16. This makes UK-to-AUS conversion trivial. However, the underlying measurement ranges for Australian sizes tend to be slightly more generous than UK equivalents, so a garment labelled AUS 12 may fit slightly larger than a UK 12 from the same brand. For men's clothing, Australian sizes typically match UK conventions. Australian shoe sizes historically followed the UK system but have been increasingly shifting to US sizing, particularly in sportswear, so always check which system a shoe is labelled in.

How to measure yourself for clothing

Accurate body measurements are the most reliable way to find the right clothing size across any region. Use a flexible fabric measuring tape and measure each dimension at its fullest point. Chest/bust: measure around the fullest part of the chest, keeping the tape horizontal across the back. Waist: measure around the narrowest part of the torso, typically 2–3 cm above the navel. Hips: measure around the fullest part of the hips and bottom, typically about 20 cm below the natural waist. Inside leg/inseam: measure from the crotch to the floor along the inside of the leg. For the most accurate results, wear minimal clothing and keep the measuring tape snug but not tight. If your measurements fall between sizes, size up for comfort or follow the brand's guidance.

Why clothing sizes vary between brands

There is no legal or industry standard that dictates what measurements correspond to a given clothing size label. Each brand defines its own size specifications, and these have shifted considerably over time. A phenomenon known as vanity sizing — relabelling garments with smaller numbers while keeping or increasing the actual garment dimensions — has been widespread since the 1970s. Research has found that the actual measurements of a nominally identical size can vary by up to 6 inches between different retailers. The practical consequence is that a woman who wears a size 12 in one brand may find she is a size 10 or 14 in another. For online shopping, always measure yourself and compare those measurements against the specific brand's size chart — never assume your usual label size will fit across different brands or regions.

Children's clothing sizes — age vs height

Children's clothing sizes are typically based on age (e.g., 2–3 years, 4–5 years) but since children of the same age vary significantly in height and build, height-based sizing is considerably more reliable. EU children's sizes are expressed as the child's height in centimetres — EU size 98 corresponds to a child approximately 98 cm tall (roughly 2–3 years). UK children's clothing is typically sold by age range, but most quality brands also indicate height in centimetres on the label. If your child is taller or shorter than average for their age, always size based on height rather than age. For footwear, children's shoe sizes are measured differently from adult sizes and use their own scale — a child moving to adult sizes will experience a size jump of several numbers.

Bra size conversion — the most complex conversion of all

Bra sizing is the most complicated garment size conversion because it uses two components — band size and cup size — and these are measured differently in each region. UK and US bra band sizes are expressed in inches (UK 34, US 34), but the cup letter systems differ: a UK D cup corresponds to a US D cup but the measurement range is slightly different. EU bra band sizes are expressed in centimetres (typically the underbust measurement plus 10–15 cm), so a UK 34 is approximately EU 75. Converting bra sizes between systems requires checking both the band and cup separately. Additionally, international brands such as French (FR) and Italian luxury lingerie brands use their own sizing conventions that do not map directly to either the UK or EU system without a specific conversion table.

Tips for shopping clothes internationally online

Shopping for clothing from international retailers introduces several common pitfalls beyond just size conversion. Photography angles can make garments appear slimmer or longer than they are in person — always look for flat-lay images or multiple model views when available. Fabric composition affects fit significantly: a size 12 in a 100% cotton jersey will behave differently from the same label in a woven cotton — check the care label and fabric details before ordering. Return policies vary dramatically for international orders — EU-based retailers must legally allow returns within 14 days for online purchases, but US and Australian retailers operate under different rules. Always check the return window and whether the buyer pays return shipping before ordering a size you are uncertain about. For shoes specifically, half-sizes matter enormously — if you are between sizes in one system, size up rather than down to avoid discomfort. For denim, note that many jeans stretch 1–2 sizes with wear, so sizing down is sometimes appropriate for raw denim but not for stretch denim.

Frequently asked questions