“43 in US” is usually asking what EU shoe size 43 equals in US sizing. For most adult footwear, EU 43 converts to about:

  • Men’s US size: 9.5–10
  • Women’s US size: 11–11.5

Different brands fit slightly differently, so it’s always smart to:

  • Check the brand’s own size chart for EU 43 → US.
  • Measure your foot (heel to toe in cm) and match that to their length-based chart.
  • If you’re between sizes, go up a half-size for sneakers/running shoes and consider true-to-size for dress shoes.

If you meant something else by “whatsizeis 43inus” (like clothing or TV size), tell me the item and I’ll convert that too.