🧳 Linear Inches Calculator

How to Use This Linear Inches Calculator

Airlines judge checked bags by one number: length plus width plus height. Enter your bag\'s three dimensions including wheels and handles to see where you land against the 62-inch limit.

The Formula

The single-number system lets a long skinny bag and a short fat bag share one rule. Note it is separate from weight limits, usually 50 pounds for economy; a bag can pass the size test and fail the weight test. Both fees can stack on the same bag, which is how a $30 checked bag becomes $200.

Worked Example

A bag measures 28 long, 20 wide, 12 deep. Linear inches = 28 + 20 + 12 = 60, two inches under the 62 limit, so it flies without oversize fees on most airlines. Add protruding wheels that make it 29 long: 61, still fine. But a 32-inch trunk at 32 + 20 + 14 = 66 lands in the oversize zone, likely a $100-plus fee each way. Two inches of bag can cost $200 round trip, which is worth knowing before you buy the bigger case.

Buying Luggage With the Limit in Mind

Manufacturers sell 28, 30, and 32-inch cases; only the 28 reliably stays under 62 once wheels and packing are counted. A 30-inch case at 30 x 20 x 12 hits exactly 62 empty, leaving zero margin for bulging. If you routinely pack heavy, a 27-inch case is the sweet spot: comfortably under the limit with room to overstuff. Hardside cases hold their dimensions better than softside, which grow when stuffed.

Packing to Stay Under the Limit

Compression packing cubes are the easiest way to gain margin: they flatten clothes so the bag closes at its rated dimensions instead of bulging past them. Wear your bulkiest items, boots and jackets, on the plane rather than packing them. If you are near the limit, move dense items like books and toiletries to your personal item. And weigh the bag too, because size compliance means nothing if it tips past 50 pounds; a bathroom scale and subtraction works fine.

International Differences

The 62-inch rule is a US standard; international carriers often use 158 cm, which is 62.2 inches, effectively the same. Budget airlines may set lower limits or charge for any checked bag regardless of size. Some Asian and Middle Eastern carriers allow 2 bags at 62 inches each in economy, more generous than US airlines. Always check your specific airline and fare class before flying; the calculator tells you the number, the airline tells you the rule.

Worked Example: The International 158 cm Rule

Many international airlines cap checked bags at 158 cm total dimensions. Convert: 158 / 2.54 = 62.2 inches, essentially the same as the US 62-inch rule. A bag measuring 75 x 50 x 30 cm: 75 + 50 + 30 = 155 cm, under the limit. A 78 x 52 x 32 cm trunk: 162 cm, over, and the oversize fee applies in both directions.

Carry-on has its own linear math: the standard 22 x 14 x 9 inches = 45 linear inches, which is why that number appears on every airline's carry-on page. Measure your carry-on the same way before buying; wheels and handles count, and they add 1 to 2 inches manufacturers like to forget.

Linear Inches vs. Weight: The Two Limits

Size is only half the gate. Domestic checked bags face 62 linear inches and 50 lbs; international often 158 cm and 23 kg (50.7 lbs). A bag can pass one limit and fail the other: dense packers hit weight first, bulky packers hit size first. Know which packer you are before choosing the bag.

Sports equipment gets special treatment on many airlines: skis, golf clubs, and surfboards often fly under separate sports waivers with their own size allowances, sometimes more generous than standard luggage. Check the airline's sports page before paying oversize fees; the waiver is frequently cheaper than the fee. And whatever you fly, weigh the packed bag at home. The $200 round-trip oversize surprise is the most avoidable fee in travel.

The Soft-Sided Advantage

Soft-sided bags compress, which buys back an inch or two at the check-in counter when the agent eyes your bag suspiciously. A 63-inch soft duffel cinched down often passes where a rigid 63-inch case gets flagged, because the measurement that matters is the one at the counter, not on the tag. Pack soft, measure honestly, and keep a luggage scale in the side pocket.

The 62-Inch Rule and Its History

The 62 linear inch limit (length plus width plus height) has been the US airline standard for checked bags for decades, and it exists because it describes the largest bag that fits through the standard baggage system and into a cargo hold without special handling. Anything over 62 inches is oversize, and oversize fees run $100 to $200 per bag each way on domestic flights, which is often more than the ticket savings that made you pack big. The limit is generous: a typical large checked bag is 30 x 20 x 12, or 62 inches exactly. Manufacturers design to the rule, so if your bag was sold as a "large checked bag," it almost certainly complies. Measure only if the bag is unusual, expanded, or stuffed past its zippers.

Worked Example: The Expanded Bag Trap

Your bag measures 29 x 19 x 11 closed: 59 linear inches, safely under. You zip open the 2-inch expander for the trip home: 29 x 19 x 13 is 61 inches, still fine. But the souvenirs go in the front pocket, bulging it another 2 inches: 63 inches, oversize, and the agent's tape measure does not care that it was fine yesterday. The $150 oversize fee just ate your souvenir budget. The fix is boring: measure the bag packed as you will check it, expander and bulges included, and keep a soft tape in your luggage. Airlines measure at check-in, not at purchase, and the packed bag is the only measurement that counts.