Measure length, width, and depth with a tape measure or ruler

To measure luggage, you need the three dimensions: length (top to bottom), width (left to right), and depth (front to back). Use a soft tape measure or a rigid ruler, and measure the outside of the bag in inches or centimetres, depending on what the airline or venue requires. Measure at the widest point of each dimension — if your bag bulges, measure the bulge, not the flat part.

Place the bag on a flat surface and measure straight across. Do not angle the ruler or tape. Write down all three numbers. Most luggage size limits are stated as length + width + depth, so you will add these three numbers together to see if your bag meets the requirement.

Key Takeaways

  • Measure the outside of the bag at its widest point in all three dimensions: length, width, and depth.
  • Most airlines and venues add the three measurements together, so you need the total to stay under their stated limit.
  • Soft tape measures are easier to use on luggage than rigid rulers, but both give accurate results.
  • Measure your bag when it is empty first, then again when packed, because a full bag may bulge beyond its normal shape.
  • Keep your measurements written down or take a photo of them so you have them when you book travel or check venue rules.

Understand the difference between linear inches and total inches

Airlines and hotels often state size limits in two different ways, and mixing them up is the most common mistake. Linear inches means you add length + width + depth together. A bag that is 22 inches long, 14 inches wide, and 9 inches deep has 45 linear inches total. Total inches is the same thing — it is just another name for the sum of all three dimensions.

Some venues instead state a limit for each dimension separately. For example, a venue might say "no bag larger than 18 × 14 × 8 inches." In that case, your bag must be 18 inches or smaller in length, 14 inches or smaller in width, and 8 inches or smaller in depth. Check the rule carefully before you measure, because the two methods are not the same.

Measure when your bag is packed the way you will use it

An empty bag and a full bag can have very different dimensions. Soft-sided luggage expands when you pack it, and hard-sided luggage may not expand but the contents can shift the shape slightly. Measure your bag the way you actually plan to use it — with the items inside that you normally carry.

If you are buying luggage for a specific trip, pack it as you would for that trip, then measure. If you are checking whether existing luggage meets a size limit, pack it the way you normally do. This gives you the real measurement you will face when you travel or enter a venue.

Know where to find the manufacturer's stated size

Most luggage comes with a tag or label that lists the dimensions. Check the bottom of the bag, the back of the bag, or inside a pocket. The tag usually shows length × width × depth in inches. This is the manufacturer's measurement of the bag when empty, so it may be smaller than your actual measurement if you pack the bag full.

If you cannot find a tag, the luggage manual or the retailer's website will have the dimensions. Manufacturer measurements are useful as a starting point, but your own measurement of the packed bag is what matters for travel or venue rules.

Account for wheels, handles, and other protruding parts

Wheels and handles add to the overall size of your luggage. Most airlines and venues measure the bag as a whole, including wheels and handles. If your bag has wheels that stick out, measure from the outermost point of the wheel. If the handle extends above the bag when pulled up, some venues count that height in the length measurement.

Check the specific rule for the airline or venue you are using. Some count wheels and handles in the size limit, and some do not. If the rule is unclear, measure both ways — with and without the wheels and handles — so you know which measurement applies.

Use a luggage sizer if you are at the airport

Most airports have a metal or plastic frame called a luggage sizer near the check-in desk. It is a rectangular opening with the airline's size limit built in. You straightforward slide your bag into the frame. If it fits, your bag meets the size requirement. If it does not fit, your bag is too large.

Luggage sizers are free to use and take about 10 seconds. They are the most reliable way to check your bag on the spot. If your bag does not fit the sizer, the airline may charge an oversized baggage fee or require you to check the bag instead of carrying it on. Arrive early enough to use the sizer before you reach the gate.

Convert between inches and centimetres if needed

One inch equals 2.54 centimetres. If a rule is stated in centimetres and you measured in inches, multiply your inches by 2.54. If a rule is stated in inches and you measured in centimetres, divide your centimetres by 2.54. Most luggage tags show both measurements, so check the tag first before you do the math yourself.

When you add up your three dimensions, do the math in the same unit you measured in. Do not mix inches and centimetres in a single calculation. If the rule uses one unit and your measurements use another, convert all three dimensions first, then add them.

Frequently Asked Questions

Do I measure the inside or outside of my luggage?

Measure the outside. Airlines and venues care about how much space your bag takes up in the cabin or venue, not how much you can fit inside it. Measure from the outermost point of the bag on all sides.

What if my luggage is soft-sided and the dimensions change when I pack it?

Measure it when it is packed the way you will actually use it. If it bulges when full, measure the bulge. That is the real size the airline or venue will see. If you are unsure whether it will fit, measure it a few times over a few days to see the range.

Do wheels and handles count toward the size limit?

Most airlines and venues count wheels and handles as part of the bag's overall dimensions. Measure from the outermost point of the wheels and the highest point of the handle when extended. Check your specific airline or venue rule to be certain, because a few do not count them.

Can I measure my luggage with my phone instead of a tape measure?

A tape measure is more accurate, but some phone apps can estimate dimensions if you place the bag against a flat surface and take a photo. For official size checks, use a physical tape measure or ruler. Phone measurements are useful for a rough estimate only.

What should I do if my luggage is slightly over the size limit?

Check the specific rule for the airline or venue. Some allow bags that are one or two inches over the limit, and some do not. If your bag is over the limit, you may face an oversized baggage fee, be required to check it instead of carrying it on, or be asked to remove it from the venue. Contact the airline or venue before you travel to ask what happens in your situation.