About SIZER
We eliminate the friction of buying clothes in international stores.
Methodology
SIZER's size data comes directly from each brand's official size guides, published on their websites and updated whenever a brand changes their sizing system. We don't use estimates or third-party data — if Zara's official guide says M corresponds to EU 36, that's exactly what we show.
When a brand uses different sizing systems by region (for example, Shein has separate charts for Europe, the US and Asia), we flag this clearly and show the correct conversion for each market.
Every brand in our database is reviewed at least once per quarter. If you spot an error in any conversion, email us at hello@sizertool.com — we correct it within 48 hours.
Why SIZER exists
A size 38 in Spain is not the same as a 38 in France, a US 8, a UK 12, or a JP 11. This inconsistency makes buying international clothing a guessing game — especially with Asian brands like Shein or Uniqlo, where the sizing system is completely different from European standards.
SIZER exists to remove that uncertainty. Select your brand, enter your usual size, and instantly get the equivalent across all international systems. No calculations, no spreadsheets, no unnecessary returns.
Contact
Have feedback, spotted an error in our data, or want to suggest a brand? We'd love to hear from you.
Email: hello@sizertool.com