About ConvertAnySize
ConvertAnySize is a free, independent website for converting clothing, shoe and ring sizes between countries, and for converting everyday units of measurement.
We built it because the conversions people need most were scattered across slow, cluttered pages. Every tool here works instantly, on any device, without sign-up.
Accuracy
Unit conversions use exact international definitions (for example, 1 inch = 2.54 cm and 1 UK gallon = 4.54609 litres). Size conversions follow the standard charts used by most retailers, but brands cut differently, so treat them as a guide and check the retailer's own chart where you can.
Why we built it this way
Most size-converter pages online cover one thing — just shoes, or just cm to inches — and bury it under ads and pop-ups. We wanted one place that handles the whole shopping trip: what you're wearing, what you're standing on, and what recipe or spec sheet you're reading, all with the same fast, no-nonsense converter. Search across all 350+ pages from the box at the top, or just click a chip for the conversion you look up most.
How the numbers stay right
Unit conversions here use the exact internationally defined ratios (1 inch is exactly 2.54 cm, 1 UK gallon is exactly 4.54609 litres) — never a rounded approximation. Size charts are generic charts that follow the conversion tables most retailers publish. We spot-checked them against brand charts on 20 October 2026 and some rows differ: Nike's own men's chart lists US 10 as EU 44, where our generic chart shows EU 43. We show the full table alongside your result rather than a single number, because brands don't always agree with each other.
Maintained and improved
The site grows with what people actually search for — bra size and hat size were both added after users asked for them, and My Sizes (which remembers your sizes on this device, with nothing sent to a server) followed the same way. If a size chart looks off for a brand you know well, tell us and we'll check it.
Spotted a mistake? Please tell us and we'll fix it quickly.