What Are Linear Inches in Baggage?
Checked: July 2026 against the airlines we track · Measure with wheels and handles included
In plain terms
A linear measurement collapses three numbers into one. Instead of checking length, width and height separately, the airline asks for the total of all three, and sets a single ceiling for that total. The word linear here does not mean a straight-line diagonal across the bag, a common misreading. It simply means the three sides laid out and added, as if placed end to end along a line.
To find it, stand the packed bag up and measure its length, its width and its depth at the widest points. Include the wheels, the feet, the telescopic handle housing and any external pocket that bulges when full, because the airline's sizer and tape measure will. Add the three figures. That sum is your linear measurement, and it is what a checked-bag size rule caps. Airlines quote the same ceiling in inches or centimetres depending on where they are based, but both describe the identical box.
The conversions that matter
Two totals cover almost every bag you will pack on this corridor. The checked-bag ceiling is 62 linear inches. Multiply by 2.54 and that is 157.48 cm, which every airline rounds to 158 cm. The carry-on total is 45 linear inches, which is 114.3 cm, usually written as 114 cm.
| Linear inches | Exact centimetres | Rounded | Typical use |
|---|---|---|---|
| 45 in | 114.3 cm | 114 cm | Carry-on total |
| 62 in | 157.48 cm | 158 cm | Standard checked-bag ceiling |
There is one rounding wrinkle worth knowing. The classic US carry-on is 22 × 14 × 9 inches, which adds up to exactly 45 linear inches, or 114.3 cm. Convert each side on its own and round up and you get 56 × 36 × 23 cm, which sums to 115 cm. So the same cabin bag reads as 114 cm if you convert the total and 115 cm if you convert each side first. Both are correct; the one-centimetre gap is just where the rounding happens. When an airline publishes a cabin limit as a single number, such as the 115 cm total used by Oman Air and Akasa Air, it is this 45-inch idea after each side is rounded up.
A worked example with real airline numbers
Nearly every carrier we track caps a checked bag at 158 cm total, the metric face of 62 linear inches. SpiceJet, Akasa Air, Saudia and Qatar Airways all publish 158 cm as the per-piece size ceiling, and Air India Express caps a single piece at 32 kg and 158 cm. So a checked bag measuring 78 × 52 × 28 cm, which sums to 158 cm, just clears all of them, while a 30-inch suitcase near 82 × 52 × 32 cm sums to 166 cm and is over.
The 45-inch total shows up on the cabin side. Saudia states that passengers departing the United States or Canada may carry one cabin bag of 45 linear inches in every class, the same 114 cm figure. Oman Air's cabin allowance is written as a 115 cm linear total rather than three separate sides. Reading these as diagonals, or as a single side, is how a bag that looked fine at home fails at the gate.
Why it matters for your bag
Most travellers measure one side, see a number below the limit, and assume they are clear. A linear rule fails that logic, because a bag can pass on every individual side yet break the total. The only reliable move is to add all three sides, with wheels and handles, and compare the sum. That is exactly what the bag size checker does: enter your bag's length, width and height once and it tests the total against all 14 airlines we track, converting between inches and centimetres so you never have to. If you only remember one figure, make it this one: 62 linear inches is 158 cm, and that is the wall for a checked bag on almost every airline on the India to Gulf network.
Frequently asked questions
How many centimetres is 62 linear inches?
62 linear inches is 157.48 cm, which airlines round to 158 cm. It is the standard total-dimension ceiling for a checked bag, meaning length plus width plus height added together must not exceed it. A bag of roughly 78 x 52 x 28 cm sums to 158 cm and just fits.
How do I calculate linear inches?
Measure the bag's length, width and height at the widest points, including wheels, handles and any bulge, then add the three numbers. That single total is the linear measurement. If your tape is in inches, add the inches; if it is in centimetres, add the centimetres and compare against the airline's cm limit. Do not measure diagonally, and do not compress a soft bag to make it fit.
What is 45 linear inches in cm?
45 linear inches is 114.3 cm, usually written as 114 cm. It is a common carry-on total, matching the classic US cabin bag of 22 x 14 x 9 inches. Some airlines that publish a cabin limit as a single total, such as Oman Air and Akasa Air, use about 115 cm, which is the same 45-inch idea after rounding each side up.
Add the sides for me
Enter length, width and height once. The checker adds them, converts the units and tests all 14 airlines we track.
Check my bag size freeRelated terms
Definitions compiled by SafarCheck and checked July 2026 against each airline's published information. Size limits vary by airline, aircraft and route, and the allowance printed on your ticket is final. SafarCheck is not affiliated with any airline.