Carry-On Size Checker
Measure your suitcase once, enter the allowance from your airline or booking, and see whether the bag fits after rotating it.
Reviewed September 14, 2026.
Will my carry-on fit?
Use the allowance shown for your exact fare and operating airline. Measure the packed bag, including wheels, handles and bulging pockets.
Your packed bag
Measure the three longest outside edges.
Airline's current limit
Copy it from the airline or your booking.
Enter your bag and airline limits.
The checker uses only the numbers you enter.
Your measurements stay in this browser tab. They are not saved or sent to Viral Prompt Lab.
There is no universal carry-on size
Airlines can set different allowances by fare, cabin, route and aircraft. The International Air Transport Association gives 56 × 45 × 25 cm (22 × 18 × 10 in) as a general reference used by many airlines, including wheels and handles, but it is not a promise that your carrier accepts that size. Some airlines also impose weight limits.
The U.S. Federal Aviation Administration notes that 45 linear inches is a common maximum for many airlines, while also telling passengers to check their airline. A linear total is the sum of all three sides; it does not replace a carrier's individual side limits.
How to measure a carry-on correctly
- Pack the bag as you intend to travel; soft sides and front pockets can expand.
- Stand handles in their travel position, but include fixed handles, wheels and feet.
- Measure the widest, tallest and deepest outside points.
- Weigh the packed bag on a luggage scale, then repeat once to catch an uneven reading.
- Allow a small buffer when any side is very close to the limit. Airport sizers are pass/fail tools, not flexible estimates.
What this result does—and does not—mean
| Result | Action |
|---|---|
| Fits stated limits | Recheck the fare, operating carrier and route before leaving. |
| Close to the limit | Measure the fullest points again and do not rely on compressing the bag. |
| Over size or weight | Remove items, use a smaller bag or compare the airline's checked-bag option before arriving at the gate. |
| Weight rule unknown | Find the weight allowance on the airline's official baggage page or your booking. |
A bag may meet published measurements and still need to be checked when overhead bins are full or the aircraft has limited storage. Airline staff make the final decision at the airport.
Smart luggage and battery reminder
Battery rules are separate from bag-size rules. IATA advises travelers to keep many battery-powered devices in hand baggage and says smart-bag batteries may need to be removable. Check the airline's current dangerous-goods instructions before flying with a power bank, spare battery, smart bag, drone or mobility device.
Official references
- IATA passenger baggage rules
- IATA travel and baggage guidance
- FAA carry-on baggage tips
- U.S. DOT Fly Rights guidance
Plan the rest of the trip
Once the bag fits, use the free travel budget calculator to estimate flights, lodging, food, local transport, activities and a contingency buffer in one currency.
Frequently asked questions
Do carry-on dimensions include wheels and handles?
Yes. Measure the full outside dimensions, including wheels, fixed handles, feet and any pockets that bulge when packed.
Can I rotate the bag to fit?
Usually, yes. The checker tests the three sides in the most favorable orientation. The entire bag still needs to enter the sizer without forcing it.
Should I trust a retailer's listed suitcase size?
Measure the actual packed bag. Product listings may show body dimensions separately from overall dimensions or may exclude protruding parts.
This tool is independent and includes no paid placement or affiliate links. Airline policies and fees change; always verify the allowance on the operating airline's official site or in your current booking.