What exactly is a linear inch in Baggage?

One linear inch equals one-twelfth of a foot as a unit of measurement. Because an inch is a unit of linear measurement, there is no difference between a standard inch and a linear inch. Linear measures are one-dimensional, meaning they only measure length or distance along one physical line.

On the other hand, square inches, square feet, and additional square units are two-dimensional. Square measures include both length and width; you can find them by multiplying the length by width. On the other hand, linear inches are easy to find with a ruler or something similar. Linear inches measure the size of places, the height of people or things, and the length of small things like a shoelace or a piece of paper.

The airline business uses the term “linear inches” to figure out if a piece of luggage is allowed on their trips. All luggage is limited by how much it weighs and the space it takes up. This includes the bags you check and the ones you bring.

Most of the time, the flight limits on linear inches are the same. USA Today says most planes only let checked bags be up to 62 square inches long. This includes any handles or wheels that may be attached to the luggage; therefore, travellers are required to measure those components as well. The Federal Aviation Administration says many flights have a 45-inch limit on how long a carry-on bag can be.

Even though planes have rules about how many square inches a passenger’s bag can be, they often let people go over these rules for a fee. Airlines have different rules and fees for bags bigger than the maximum size.

How to Measure Linear Dimensions of Luggage?

When you carefully pack a bag and bring it to the airline’s luggage counter, nothing hurts as much as seeing an “oversize” sign on it and being charged fees that, based on the airline, can be in the hundreds. Still, all the major companies make it clear on their websites how big your luggage needs to be, generally in terms of linear inches. Just taking a few minutes to measure your pack before you go for your vacation, you may save a significant amount of money.

Understanding Linear Inches:

Linear inches, or any linear measurement, mean your bag’s total length, width, and depth. If your bag is 28 inches tall, 13 inches broad, and 10 inches deep, then its linear measurement, also known as its linear dimensions, would be 28 inches + 13 inches + 10 inches, which would be 51 linear inches. If your purse has a height of 25 inches, a width of 14 inches, and a depth of 12 inches, then the total linear measures of your bag would be 25 + 14 + 12 = 51 linear inches. As you might have guessed, using linear measurements for size rules is a good way for planes to let your luggage be a few different shapes while still putting a general size limit.

Checked Bag Size Limits:

Even though each flight sets its size limits for luggage, 62 square inches is the industry standard for checked bags. So, the bags given as examples would be allowed because their total length (51 linear inches) is less than the limit of 62 inches. But if your bag were 35 inches tall, 16 inches wide, and 14 inches deep, its linear measurements would be 35 + 16 + 14 = 65 linear inches, just over the usual limit of 62 inches.

Size Limits for Carry-Ons:

Most flights have strict rules about how tall, wide, and deep carry-on bags can be. But sometimes, they will also give the size requirements for carry-on bags in linear inches. Like the rules for checked bags, these change from airline to airline, but the most frequent limit is 45 inches.

What Happens When Bags Are Too Big:

Different airlines have different rules about what to do if you try to check a bag that is too big.If your suitcase is too large, you might not even be able to check it, but if you pay a significant amount of money, you can. Said fees change by airline and can easily reach the triple digits, so check your airline’s fee system before you go to the ticket counter. You might find out that you only need some things you brought.

What is checked luggage’s linear dimensions?

“Maximum Linear Dimensions,” also called “Linear Length,” is a term used by airlines to describe the maximum size of carry-on and checked bags. What’s the meaning? Your luggage’s linear lengths, or total linear length, are the length, width, and height added together. This number can’t be higher than the “Maximum Linear Dimensions” that your airline allows, which is usually 62 inches (158cm) for most flights.

How to Figure Out Your Suitcase’s Linear Measurements?

When figuring out the length, width, and height of your bags, you must take three measurements: the length, the width, and the height. Make sure to put in any handles or wheels that stick out when the box is folded. Then, add up the three measures, as shown:

Total Linear Length = Length + Width + HeightThis number, which is the sum of the three readings you took, must be less than or the same as the airline’s Maximum Linear Dimensions. Usually, this means that the total linear length of checked bags can be, at most, 62 inches or 158 cm.

Here are some suitcases:

The Travelpro Maxlite 5-Softside:

This case is 28 inches long, 19 inches wide, and 11 inches tall. So, when we add up these three numbers, we get 58.

This TravelPro case is 58 inches long and can be used as checked luggage.

Softside Spinner Luggage Suitcase from Amazon Basics:

This case from AmazonBasics is 30.9 by 17.5 by 12.9 inches.

When we add up all these numbers, we get 61.3 linear inches.

So, this case still needs to be 62 linear inches.

The Large Nylon Duffel Bag from AmazonBasics:

This big tote bag is 32.5 inches by 17 inches by 11.5 inches.

You get 61 inches in a straight line when you add them up.

Again, it’s less than 62 linear inches, so it’s fine to check it.

The 62 Linear Inch measurement makes it easy to measure your bags. Just follow these steps.

  • First, lay your bag flat and put a measuring tape next.
  • Measure the bag from one end to the other and write down this amount.
  • Then, measure the width of the bag in the middle and write that down, too.
  • Next, measure the height of the bag when standing on its base and write this number down.
  • Lastly, measure the bag’s depth from front to back at its largest point when it’s back on its base and standing up straight.
  • Now add up all four measures. If the total is 62 inches or less, you have measured your bag correctly according to standard size requirements.


Linear inches can be hard to understand at first, but they’re a simple way to figure out how big your luggage is before you go on a trip. Make sure to add up all the lengths, including those of the outside bags, wheels, and handles, to find the linear measurement. And remember to check your airline’s rules about items that are too big. Knowing these things, you’ll be ready for a worry-free trip.

Leave a Reply

Your email address will not be published. Required fields are marked *