Whether you're a frequent flyer or preparing for your first major trip, knowing how to measure a suitcase correctly can save you from last-minute stress, unexpected fees, and delays at the airport. With airlines becoming increasingly strict about luggage dimensions, even a small miscalculation can mean the difference between a smooth check-in and an oversized baggage charge.

Measuring your suitcase accurately ensures it meets airline requirements for both cabin and checked luggage. Since size policies vary across carriers, taking a few minutes to measure your bag properly is one of the easiest ways to avoid travel hassles.

How To Measure a Suitcase: Step-by-Step

Follow these simple steps to get precise measurements every time.

1. Place the Suitcase Upright on a Flat Surface

Start by positioning your suitcase upright on a firm, level surface such as hardwood flooring or a table. This ensures accuracy and prevents distorted measurements caused by uneven or soft surfaces.

Avoid measuring on beds, carpets, or rugs — these can cause the suitcase to tilt or sink in slightly, affecting the result.

2. Measure the Height (Bottom to Top)

Using a flexible measuring tape, measure from the ground (including wheels) to the very top of the suitcase.
If the handle does not retract fully, include it in the measurement.

Airlines always count wheels and handles toward the total size, so be sure not to leave them out.

3. Measure the Width (Side to Side)

Measure across the front of your suitcase from one side to the other at the widest point.
Include any side handles, built-in locks, bumps, or tapered sections.

Some suitcases narrow toward the top or bottom — always measure the widest part to avoid underreporting the size.

4. Measure the Depth (Front to Back)

Now measure the depth of your suitcase from front to back.
Be sure to include:

• External pockets

• Zippers

• Curved panels

• Expansion compartments

Softside luggage tip:
If your suitcase has an expandable zipper, measure it fully expanded, especially if you plan to pack it to capacity.

5. Add Height + Width + Depth (Linear Dimensions)

To calculate the total size of your suitcase, add the three measurements together. This number is known as linear dimensions, and many airlines use it to determine if your checked luggage meets their size policies.

Example:
Height: 28"
Width: 18"
Depth: 12"
Total linear dimensions = 58 inches

Most airlines have a checked baggage limit of 62 linear inches.

6. Always Include Wheels and Handles

Many travellers measure only the body of the suitcase — but airlines include everything.
This means wheels, bottom stands, side handles, and protruding tops must all be part of your measurement.

Excluding these can result in unexpected oversize fees at the airport.

7. Use a Flexible Measuring Tape

A soft, flexible measuring tape (like the kind used for tailoring) is the most accurate tool. It easily wraps around curved surfaces and edges.

If you don’t have one, use a piece of string to trace the length, then measure the string with a ruler.

8. Compare Your Measurements With Your Airline’s Size Limits

Once you have all the numbers, compare them with your airline’s official baggage rules.
Each carrier has its own size policies, especially regarding:

• Cabin bag dimensions

• Linear size for checked luggage

• Weight limits

Be sure to weigh your luggage after packing — size isn’t the only factor airlines enforce.

FAQs About Measuring Suitcases

How do I know if my suitcase is carry-on size?

Most airlines use a carry-on limit around 22" × 14" × 9", including wheels and handles.
Check your specific airline’s website, as limits can vary for domestic, international, and budget flights.

Can I use a ruler instead of a measuring tape?

Yes, but measuring tape is more accurate.
A ruler or yardstick works on flat surfaces but struggles around curved edges or uneven contours.

Do hardside and softside suitcases measure the same way?

Yes — both should be measured including wheels, handles, and external pockets.
With softside luggage, measure it when fully packed or expanded to get the most accurate size.

Final Thoughts

Knowing how to measure your suitcase correctly is a simple yet crucial travel skill. It protects you from extra fees, ensures your luggage complies with airline rules, and gives you peace of mind before heading to the airport.

Take a few moments to measure your suitcase before your next trip, and travel with confidence — whether you’re heading out for a weekend getaway or flying across the globe.