Use the BagNavigator Linear Inches Calculator to check your bag before you leave home. [Link to Checked-Bag Audit]
1. How to Calculate Linear Inches (With Wheels Included)
Unlike a carry-on sizer which uses a binary "box" test, checked luggage is audited via a tape-measure sum. To determine if your bag is compliant, you must measure the Maximum External Footprint, including all hardware.
The Worked Example:
2. The Protrusion Penalty: Hardshell vs. Softside
Material selection impacts checked compliance more than volume.
3. Oversized vs. Overweight: The Double Penalty
Airlines can "stack" penalties. If a bag exceeds 62 linear inches AND 50 lbs (23kg), you will be charged for BOTH violations. On legacy carriers, this single bag can cost over $350 to check one-way.
4. Logistics: Why 62 Inches?
Airlines enforce this rule because it matches the standardized dimensions of airport conveyor belts and ULD (Unit Load Device) cargo containers. Gear that exceeds 62 inches cannot be processed by automated sorting systems and requires manual labor, which the airline passes on to the passenger as a handling fee.
Expert Strategy: Audit your checked bag in its "Fully Expanded" state. If you are at 61 linear inches, switch to a soft-sided bag. Hardshell rivets and structural reinforcements often push gear into the 63-inch "Oversized" bracket during a manual agent audit.
Frequently Asked Questions
What are linear inches for luggage?
It is the sum of the exterior length, width, and height of your bag (L+W+H).
Do wheels count in linear inches?
Yes. Every airline requires the measurement to include all protrusions, including wheels, handles, and side-grips.
What happens if my bag is over 62 inches?
You will be redirected to the "Oversized" counter at check-in. You will be required to pay a premium handling fee, typically ranging from $150 to $200 per flight segment.