Measure the outside
Measure the bag at its widest, tallest, and deepest points. Wheels, handles, protective feet, exterior pockets, and anything that sticks out count toward the real space your bag occupies.
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Know if your carry-on fits before you reach the gate.
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Carry-on checker
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Use the bag's total outside measurements, including wheels, handles, side pockets, and other protruding parts.
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Carry-on guide
Measure once. Avoid surprises later.
Carry-on rules sound simple until airlines use different dimension orders, fare rules, and weight policies. These are the details that matter most.
Dimensions can be reordered
Airlines do not always publish measurements in the same length × width × height order. The checker can test reasonable rotations of your bag instead of rejecting a bag simply because two labels were reversed.
Size and weight are different rules
A bag can fit the published dimensions and still exceed a weight limit. Weight enforcement varies substantially by airline and route, so add weight whenever you know it.
What counts as a carry-on bag?
A carry-on is luggage you take through security and into the aircraft cabin rather than checking into the cargo hold. Most airlines limit its outside dimensions so it can fit in an overhead bin. A personal item is usually a smaller bag—such as a purse, laptop bag, compact backpack, or briefcase—that must fit under the seat in front of you.
There is no single worldwide carry-on standard. Many U.S. carriers use limits close to 22 × 14 × 9 inches, but that is a common pattern rather than a universal rule. International and low-cost airlines can use smaller limits, enforce weight more strictly, or treat cabin bags differently depending on the fare purchased.
Why a bag can fit one airline and fail another
Aircraft type, overhead-bin design, airline operating practices, and fare structure all influence baggage rules. Even when two airlines publish similar limits, one may impose a cabin weight maximum while another does not publish a standard weight cap. Some basic fares also restrict the number or type of bags allowed.
Soft-sided vs. hard-shell luggage
Soft bags can compress, but travelers should not rely on aggressive squeezing to make an oversized bag compliant. Airline sizers are physical frames: if the bag cannot fit naturally, staff may require it to be checked. Hard-shell luggage is easier to measure consistently, but wheels and handles can make its real outside dimensions larger than the shell itself.
Common mistakes
Small details that cause gate problems
Ignoring wheels
The wheel housing often adds an inch or more to the actual height.
Measuring an empty bag
Soft luggage and exterior pockets can expand after packing.
Assuming every fare includes a carry-on
Some restrictive fares include only a personal item.
Using an old baggage rule
Policies change. Verify the airline's current page before an important trip.
FAQ
Carry-on questions, answered
Do wheels and handles count in carry-on dimensions?+
Yes. Measure the total outside size of your packed bag, including wheels, fixed handles, feet, pockets, and other protrusions. Those parts occupy space in an airline sizer and overhead bin.
What is the most common U.S. carry-on size?+
Many U.S. airlines publish limits around 22 × 14 × 9 inches, but there is no legally universal standard. Always check the specific airline and fare you are flying.
What if my bag is only slightly over the limit?+
Enforcement is ultimately up to the airline. A small difference may go unnoticed, but you should not assume a bag outside the published limit will be accepted. If it does not fit a physical sizer, you may be required to check it and possibly pay a fee.
Why does the checker allow the dimensions to rotate?+
Airlines and luggage makers sometimes label length, width, height, and depth differently. For a rectangular bag, the practical question is whether its three outside dimensions can fit within the airline's three-dimensional limit in some orientation. You can disable rotation for a stricter label-to-label comparison.
Does passing the size check guarantee my bag can go onboard?+
No. Size is only one part of the policy. Your fare, bag allowance, weight, route, aircraft, hazardous-items rules, and available bin space can still affect whether a bag is accepted in the cabin.
Is a personal item the same as a carry-on?+
No. A personal item is normally the smaller piece intended to fit beneath the seat. A standard carry-on typically goes in the overhead bin. Exact allowances depend on the airline and ticket.
Should I measure in inches or centimeters?+
Use whichever system you prefer. The checker converts the airline limits so the comparison and result remain in the same unit system you selected.
How current is the airline data?+
Our curated 55-airline database records the date each policy entry was reviewed and links to the airline’s official baggage page. Policies, fares, and route-specific allowances can still change without notice, so the airline remains the final authority.
How we work
A simple checker should still explain its work.
CarryOnChecker exists to remove a repetitive travel headache: finding an airline's cabin-bag limit and figuring out whether a bag actually fits it.
Our comparison uses the airline dimensions stored in the site database and compares them against the outside dimensions you enter. When rotation is enabled, the tool checks possible orientations because airlines and bag manufacturers do not always use dimension labels consistently. Weight is evaluated separately when both your bag weight and a published airline limit are available.
We aim to keep the tool practical, transparent, and free. We do not sell baggage allowances, issue airline approvals, or represent any airline. Published airline rules remain the authoritative source.
Editorial standards
Useful first, searchable second.
We build content around questions travelers actually need answered. Airline baggage information is treated as reference data, not as a substitute for an airline's own contract of carriage or current baggage page. When we identify an outdated rule, our goal is to correct it rather than preserve stale content for search traffic.
We distinguish general travel guidance from airline-specific limits and avoid presenting estimates as guarantees. The checker also explains uncertainty—such as route-specific or fare-specific restrictions—where a simple pass/fail answer could be misleading.
Contact
Found something we should fix?
Airline baggage policies change. If you see a size limit, weight limit, airline name, or source that appears outdated, send the airline and the rule you believe has changed. Clear reports help us review updates faster.
For site feedback, accessibility problems, corrections, or partnership inquiries, contact customerservice@carryonchecker.net.