28 shoe and 37 bra brands, from their own size charts
Your size at any brand, before you order.
Tell us the size you wear at one brand. We read both brands' official size charts and tell you what to buy at the other, and how sure we are.
Free, no account. Every answer names the chart it came from.
Your size at another brand
From each brand's own size chart. Nothing you pick leaves your browser.
Shoes
Does it run small?
Each brand's chart says which foot every size is built for. Side by side, the brands that run small or large show up in their own numbers.
- NikeChart runs long. By length, half a size down; wide feet, your usual size.
- adidasTrue to size by its chart. Your usual size.
- HOKAIts chart cannot tell: see what to buy
- BrooksIts chart cannot tell: see what to buy
- ASICSTrue to size by its chart. Your usual size.
- New BalanceChart runs long. By length, half a size down; wide feet, your usual size.
- OnChart runs long. By length, half a size down; wide feet, your usual size.
- SauconyTrue to size by its chart. Your usual size.
- AltraTrue to size by its chart. Your usual size.
- ClarksChart runs short. By length, half a size up.
- ConverseTrue to size by its chart. Your usual size.
- Golden GooseChart runs long. By length, half a size down; wide feet, your usual size.
Size converters
US, UK, EU and brand to brand.
Shoe size converter
US, UK, EU and CM, and any brand to any other brand by the foot length each publishes.
28 brand chartsBra size converter
UK, US, EU, FR and AU. Cups are counted along each brand's own letter order, because US brands disagree after DD.
37 brand chartsAlso: jeans, leggings, dresses and tops, tights and men's shoes.
Size guides
Why the number on the tag lies.
US to EU shoe size, brand by brand
The same US women's shoe size is a different EU and UK size at each brand. Official charts compared side by side for US 6 to 11, checked by hand.
7 min read · built from brands' own chartsUK vs US bra sizes: where the cups split
UK and US bands match, but cups split after DD: UK E is US DDD and UK F is US G. Cup and band charts for UK, US, EU, FR, AU and JP from brand sources.
6 min read · built from brands' own chartsHow shoe sizes are built: barleycorns, Paris points and centimetres
US and UK sizes count thirds of an inch, EU sizes count two thirds of a centimetre, JP sizes are a length. The formulas, and how far brand charts stray.
6 min read · built from brands' own chartsMen's to women's shoe sizes: the offset depends on the brand
Most brands put a women's size 1.5 above the men's, but not all. The offset each brand prints on its own chart, and how to buy unisex shoes by length.
4 min read · built from brands' own chartsBra sister sizes: the same cup on a different band
34C, 32D and 36B hold the same cup volume. Find your sister sizes in US and UK letters, see the full chart, and learn when a sister size fixes the fit.
4 min read · built from brands' own chartsShoe widths: what B, D, 2E and 4E mean for women and men
Women's shoes are made in B and men's in D, so a men's medium is about a women's wide. Width letters by gender, and how to convert a wide size across.
4 min read · built from brands' own chartsEvery answer shows its source
Each size comes from a brand's own size guide, checked by hand and linked. Where two brands' charts disagree with their labels, the answer says so and lowers its confidence.
Money never changes a size
No affiliate rate, sponsorship or brand payment touches a size suggestion. If a link ever earns us anything, it says so next to the link.
Wearers when there are enough
Once five people who own both brands tell us what fits, their answer appears beside the charts. Below that you see "not enough yet", never a made-up average.