How Do You Measure Luggage?
QUICK ANSWER
To measure luggage, use a tape measure to record its height, width, and depth in inches, always including the wheels, handles, and any external pockets. Airlines judge size by these outer dimensions, and often by linear inches, which is the three measurements added together.
Measuring your luggage correctly is the only way to know whether it meets carry-on or checked-bag limits before you reach the airport, where a sizer at the gate has the final say. Here is how to measure a bag, what linear inches means, whether wheels count, and how to check carry-on size.
How do you measure luggage?
Measuring luggage is simple with a tape measure. Stand the bag upright as it would sit when packed, and measure three dimensions in inches: the height from the floor to the very top, the width across the widest point, and the depth from front to back at the thickest point. Crucially, measure the full external size, meaning you include the wheels, the handles, feet, and any bulging pockets, because airlines measure the outside of the bag as it actually is, not just the main compartment. Write down all three numbers. If your bag has an expansion zipper, measure it both collapsed and expanded, since the expanded size is what counts if you use it.
What are linear inches?
Linear inches is the measurement airlines most often use for checked bags, and it is simply the sum of the three dimensions. You add the height plus the width plus the depth, and the total is the linear-inch figure. For example, a bag that is 28 by 18 by 12 inches has a linear measurement of 58 inches. Most airlines cap standard checked bags at 62 linear inches (158 centimeters), so that bag would qualify. Carry-on limits are usually given as three separate maximum dimensions instead, such as 22 by 14 by 9 inches, rather than a linear total. Knowing both formats lets you check your bag against whichever limit your airline uses.
Do wheels and handles count?
Yes, and this trips up a lot of travelers. Airlines measure the total external dimensions of a bag, which means the wheels, the retractable handle housing, side handles, feet, and any protruding pockets are all included in the measurement. A suitcase advertised as a carry-on based on its body alone can exceed the limit once the wheels and handle are counted, which is a common reason bags get flagged at the gate. So always measure to the outermost points. This is also why a gate agent's sizer box, which the whole bag including wheels must fit into, is the real test. When in doubt, measure the largest external footprint and compare that to the limit.
How do you know if a bag is carry-on size?
Measure the bag's full external dimensions including wheels and handles, then compare them to your airline's stated carry-on limits, commonly around 22 by 14 by 9 inches, though it varies by carrier and can be smaller on regional jets or budget airlines. Every one of your three measurements must be at or under the airline's corresponding maximum, not just the total. Remember that the gate sizer is the final judge, so leave a little margin rather than measuring exactly to the limit. If your bag is soft-sided and slightly over, it may still squeeze into the sizer, but a hard-sided bag will not. Checking against your specific airline before you fly avoids a gate-check surprise.
To measure luggage, record its height, width, and depth in inches including the wheels and handles, since airlines measure the full external size. Add the three for the linear-inch total, capped around 62 inches for checked bags, and compare each dimension to your airline's carry-on limits, usually near 22 by 14 by 9 inches.
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