Calculate linear inches (L + W + H) for luggage and baggage to check airline size requirements. Essential for travelers planning carry-on and checked bags.
Last updated: March 2026 | By Patchworkr Team
Linear inches is a measurement used by airlines to determine luggage size by adding together the length, width, and height of a bag. The formula is simple: Linear Inches = Length + Width + Height.
Airlines use this single number to quickly assess whether your baggage meets their size restrictions without needing to check each dimension individually. It's a standardized way to ensure luggage fits in overhead bins, under seats, or meets checked baggage requirements.
Most airlines have three categories: Personal Items (≤45"), Carry-On Bags (≤62"), and Checked Bags (≤115"). Anything exceeding 115" is typically considered oversized and may incur additional fees.
Note: Specific limits vary by airline and ticket class. Always check your airline's policy.
Checking a Standard Carry-On Suitcase
Your suitcase is well under the 62-inch carry-on limit! It actually qualifies as a personal item and could fit under the seat in front of you.
Yes! Always include wheels, handles, and any external pockets when measuring. Airlines measure the total external dimensions of your bag.
For carry-ons, you may be required to check it (often with a fee). For checked bags exceeding 115", you'll typically pay oversized baggage fees ranging from $100-$300+.
No. Linear inches add the three dimensions (L+W+H), while cubic inches multiply them (L×W×H). Airlines use linear inches, not volume.
No. While 62" for carry-on and 115" for checked bags are common, budget airlines often have stricter limits. Always check your specific airline's policy.
Yes. First convert each dimension from cm to inches (divide by 2.54), then add them together. Example: 56cm = 22", 35cm = 14", 23cm = 9" → 45 linear inches.
Linear inches measure size, not weight. Airlines have separate weight limits (typically 50 lbs for checked bags, 15-25 lbs for carry-ons). You must meet both requirements.
No. Linear inches are the same regardless of how you orient the bag. 22+14+9 = 14+9+22 = 45". The order doesn't matter in addition.
Measure it when fully packed and expanded. Soft bags can bulge significantly when filled, potentially exceeding limits even if empty dimensions are fine.
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