A typical carry-on suitcase is usually around 22 x 14 x 9 inches (about 56 x 36 x 23 cm), including the handles and wheels.

Standard carry-on size

  • Many major U.S. airlines use 22 x 14 x 9 inches as the maximum size for a standard cabin suitcase.
  • This is roughly 45–46 “linear inches” when you add length + width + height, which is another way some airlines describe limits.

International vs. domestic

  • Domestic U.S. flights tend to allow the full 22 x 14 x 9 inches, so most “standard carry-on” rollers are built to that spec.
  • Many international or smaller European airlines are a bit stricter, sometimes capping height closer to about 21.5 inches and widths up to about 15.5 inches.

What airlines actually measure

  • Airlines count the entire bag size, including wheels, top handle, and side handles, not just the main box.
  • If your suitcase is even 0.5–1 inch over, it may still fly sometimes, but you risk being forced to check it on stricter routes or busy flights.

Quick rules of thumb

  • Aim for a bag labeled around 21–22 inches tall and always check that the full external dimensions (with wheels) are at or under 22 x 14 x 9 inches.
  • Before a trip, confirm your specific airline’s carry-on page, since charts show real limits ranging roughly from about 18.5 x 13 x 8 inches up to 24 x 16 x 10 inches depending on the carrier.

TL;DR: If you want a “safe” carry-on suitcase for most airlines, look for one that’s no bigger than 22 x 14 x 9 inches, wheels and handles included.

Information gathered from public forums or data available on the internet and portrayed here.