Luggage size converter: cm to inches, kg to lb

78 cm is 30.7 inches, so a 78 cm suitcase is a large checked case, usually sold as 30 or 31 inch. With typical width and depth of about 50 x 30 cm it comes to roughly 158 cm (62 linear inches), right at the standard checked limit, so check the listing's wheels-included figure before buying for an airline that charges oversize fees.

77 cm is 30.3 inches. European retailers label the 77 cm case as a large checked suitcase, the same class US retailers sell as 30 inch. At about 77 x 50 x 30 cm it measures 157 linear cm, just inside the 158 cm (62 inch) standard, with no margin for bulging pockets.

55 cm is 21.65 inches, the long side of the common European carry-on limit (55 x 40 x 23 cm or 55 x 35 x 25 cm). A suitcase sold as 22 inch is 55.9 cm, almost a centimetre over, which is why US carry-ons fail European sizers; a 21 inch (53.3 cm) bag fits.

55 x 40 x 25 cm is 21.65 x 15.75 x 9.84 inches. It is a common European cabin bag size and a frequent listing size for small hardside cases. A 22 x 14 x 9 inch US bag is too long for it by about a third of an inch.

90 x 75 x 43 cm is 35.4 x 29.5 x 16.9 inches, 208 cm or 81.9 linear inches in total. That is far past the 62 inch (158 cm) standard checked bag size, so a bag that large pays oversize fees or must travel as cargo; even Allegiant, the most generous airline on this site, caps a checked bag at 80 linear inches (203 cm).

55 x 40 x 20 cm is 21.65 x 15.75 x 7.87 inches. It is Ryanair's paid overhead bag size and Icelandair's carry-on size. A US-standard 22 x 14 x 9 inch bag is too long and too deep for it, so a bag bought for US flights often fails there.

23 kg is 50.7 lb, which is why airlines that publish both write it as 23 kg / 50 lb. It is the standard Economy checked bag limit at most full-service airlines. 32 kg is 70.5 lb, the common premium-cabin and absolute per-bag maximum.