What Size Bag
Your answer

Linear inches calculator

Linear inches are a bag’s length + width + height. Most US airlines take a checked bag up to 62 linear inches without an oversize fee.

Linear size

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How to measure

Stand the bag up and measure the longest side from the floor to the top of the handle, then across the widest part and front to back, wheels and pockets included. Add the three. United, Southwest, JetBlue, Frontier, Sun Country and Avelo say to include the wheels and handles in a checked bag’s size.

A small wheeled carry-on standing on its wheels with the handle pushed down, with three measuring lines: from the floor to the top of the handle, across the front at the widest point including the wheels, and from the back to the front of the packed front pocket.
The three sides to add: height from the floor to the top of the handle, then width and depth, each at the bag’s widest point.

Carry-ons have a total too

Delta, Alaska and Hawaiian cap a carry-on at 45 linear inches as well as 22 x 14 x 9 inches.

Common questions

How many linear inches is a 28 inch suitcase?

Add its width and depth to the 28. A suitcase 28 x 18 x 11 inches is 57 linear inches, within a 62 inch limit; one 28 x 20 x 16 inches is 64.

What is 158 cm in linear inches?

158 cm is about 62 inches. American and United print their 62 inch limit as 158 cm, and Delta and JetBlue print 157 cm and 157.48 cm.

Keep going

Carry-on size chartPersonal item size chartChecked bag size chartPersonal item vs carry-onBasic economy carry-on rulesWill my bag fit?

Where we get our information from

The limits come from each airline’s own checked bag and carry-on pages, read in October 2026. Checked against published data from Delta Air Lines, Southwest Airlines, American Airlines, Alaska Airlines and Frontier Airlines (plus 7 more).

See all 24 sources
  • American Airlines, Checked bag policy (aa.com)
  • American Airlines, Oversize and overweight bags (aa.com)
  • Delta Air Lines, Carry-On Baggage (delta.com)
  • Delta Air Lines, Baggage Policy and Fees (delta.com)
  • Delta Air Lines, Excess & Overweight Baggage Policy (delta.com)
  • United Airlines, Checked bags (united.com)
  • Southwest Airlines, Checked Bag Policy (support.southwest.com)
  • Southwest Airlines, Optional Travel Charges (southwest.com)
  • Alaska Airlines, Carry-on luggage size limit (alaskaair.com)
  • Alaska Airlines, Checked baggage fees and policies (alaskaair.com)
  • JetBlue, Checked Bags (jetblue.com)
  • Frontier Airlines, Bag Options (flyfrontier.com)
  • Frontier Airlines, What are the sizes and weight limits for bags? (faq.flyfrontier.com)
  • Allegiant Air, Carry-On and Checked Baggage Policy, Size and Fees (allegiantair.com)
  • Sun Country Airlines, Bags and Optional Services (suncountry.com)
  • Sun Country Airlines, Contract of Carriage, updated January 1, 2026
  • Breeze Airways, Bag Allowance and Dimensions (flybreeze.com)
  • Southwest Airlines, Contract of Carriage, effective September 24, 2026
  • Hawaiian Airlines, Carry-on luggage size limit (hawaiianairlines.com)
  • Hawaiian Airlines, Checked baggage fees and policies (hawaiianairlines.com)
  • Allegiant Air, Optional Services Fees (allegiantair.com)
  • Breeze Airways, Bag Pricing (flybreeze.com)
  • Avelo Airlines, Checked Bags (aveloair.com)
  • Avelo Airlines, Optional services (aveloair.com)

General guidance from airline, TSA and FAA rules, checked on the date shown. Rules change, and the airline and security officers decide on the day: check your airline before you fly.