Will it fit? Bag size checker and bag fee calculator

Enter your bag's size to see, airline by airline, whether it's a free personal item, a carry-on, or a checked bag, then see what your bags will cost and whether the cheap fare is really cheaper.

Sizes and fees checked October 2026. Fees change, so confirm at booking.

Quick answers

What is the standard personal item size?

On many US airlines it's 18 x 14 x 8 inches, but United allows only 17 x 10 x 9, and Delta, Southwest, and Alaska publish no official size.

What carry-on size works on most US airlines?

22 x 14 x 9 inches, including wheels and handles, fits American, Delta, United, Alaska, and JetBlue. Southwest and Frontier allow 24 x 16 x 10.

Which airlines charge for a carry-on?

Frontier and Allegiant. United's domestic Basic Economy also excludes a full-size carry-on.

Checker by airline: Frontier, United, American, Allegiant, Southwest, JetBlue, Delta, Alaska.