Every size, every region,
in one quiet place.
Convert between US, UK, EU, JP, AU and CN sizing for shoes, rings, clothing and more. No accounts, no clutter, just accurate results.
Shoe size converter
Enter any value and the rest update live.
Four converters,
six regions each.
Shoe size
US, UK, EU, JP, AU, CN with foot-length interpolation.
Open → 5 regionsRing size
Circumference and diameter, plus US and EU numeric.
Open → 5 regionsBra size
Band and cup across US, UK, EU, JP and AU systems.
Open → 6 regionsClothing
Tops, bottoms and dresses across six regions.
Open →Three steps, no guessing.
Enter your size
Pick the system you know: US, UK, EU, or measure in centimetres. One input is all it takes.
See every region
All conversions appear instantly: no button to click, no page to reload. Just clear, live results.
Read the fit notes
Brand-specific tips and sizing quirks appear alongside your results. Italian brands run smaller. Nike runs small in certain models. You deserve to know.
Four quiet promises.
Free, truly
No signup, no premium tier, no paywall, no "create account to see your results." Every converter is fully accessible the moment you arrive.
Mobile-first
Designed for the phone in your hand, not the desktop you left at home. Large touch targets, instant results, clean typography at any screen size.
Honest about limits
Sizes vary by brand, by year, by factory batch. We tell you where the gaps are instead of pretending precision that does not exist.
No data games
We do not collect your measurements, do not sell your data, do not ask you to sign in. Your size is yours alone.
Small clarifications.
Is MySizeIs free to use?+
Yes, completely free. No signup, no premium tier, no upsell. All converters are available instantly without creating an account. MySizeIs is supported by non-intrusive ads that never block the tools you came to use.
Do I need to create an account?+
No. MySizeIs has no accounts, no login, no registration. Just open the converter you need and use it immediately. We believe tools should work for you without asking for anything in return.
Why don\'t shoe sizes match across countries?+
Different countries developed their sizing systems independently. The US and UK use the barleycorn system (one-third inch increments) but with different starting points. The EU uses the Paris point (two-thirds of a centimeter). Japan uses centimeters directly. These different base units create the mismatches that make international shopping confusing.
Which sizing system is most accurate?+
The Mondopoint system (used in Japan and for military and safety footwear) is the most precise because it measures foot length in millimeters. For everyday use, measuring your foot in centimeters and converting gives the best results across all systems.
Do brands really size differently?+
Yes, significantly. Italian brands like Diesel and Versace often run smaller. Nike tends to run small in some models. New Balance tends to run true to size. Japanese lingerie cups run one to two sizes smaller than US equivalents. MySizeIs includes brand-fit notes on every converter to help you adjust for these differences.
Can I use MySizeIs offline?+
Once a page loads, the converters work without an internet connection since all calculations happen in your browser. You can bookmark any converter for quick access anytime.