Luggage size checker
Enter your bag's height, width and depth to get its linear size and volume in both cm and inches, and see which common airline size limits it fits.
Check against my airline's limit
Linear size (height + width + depth)
115cm- In the other unit
- 45.3 in
- Dimensions
- 21.7 × 15.7 × 7.9 in
- Volume
- 44 L
Fits these common limits?
Reference sizes only. Your airline's own limit is what counts at the gate.
How airlines measure bags
Airlines check two things. Cabin bags usually have a maximum height, width and depth, and the bag has to fit all three, often in a sizer frame at the gate. Checked bags usually have a maximum linear size, which is the height, width and depth added together. The most common checked limit is 158 cm, or 62 inches.
Both include wheels, handles and outside pockets, so measure the bag at its widest points with the handle pushed down. A bag sold as "55 cm" is sometimes measured without its wheels.
Common size references
| Type | Size |
|---|---|
| Small under-seat bag | 40 × 30 × 20 cm |
| US carry-on standard | 22 × 14 × 9 in (56 × 36 × 23 cm) |
| IATA cabin guideline | 56 × 45 × 25 cm |
| Standard checked bag | 158 cm (62 in) linear |
These are widely used reference sizes, not rules for any one airline. Budget airlines in particular often set smaller cabin limits and charge for bags that don't fit, so always check the limit on your booking.
Tips for fitting the limit
- Soft-sided bags can squeeze into a sizer an inch or two smaller than their listed size. Hard-shell cases can't.
- Overpacked outside pockets add depth. Keep them flat if your bag is close to the limit.
- Size and weight are checked separately. Use the packing weight planner to check the weight too.
Common questions
What does linear inches or linear cm mean?
It is the height, width and depth of the bag added together. A bag that is 27 × 21 × 14 inches has a linear size of 62 inches, which matches the most common checked bag limit.
Does the volume in liters tell me if a bag fits?
Not on its own. Airlines limit dimensions, not liters. Volume here is calculated from the outside size, so the space you can actually pack is a little smaller. It is useful for comparing bags, since backpacks are often sold by liters.
Is a 55 × 40 × 20 cm bag allowed as a carry-on?
It fits the IATA cabin guideline and many airlines' cabin limits, but not the US 22 × 14 × 9 inch standard, because 40 cm is wider than 14 inches. Check your airline before you fly.