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Luggage size converter: cm, inches, kg and lb

Updated 2026-09-24. Researched from airline pages and published specifications.

Quick answer55 x 40 x 23 cm is 21.7 x 15.7 x 9.1 inches, and 22 x 14 x 9 inches is 55.9 x 35.6 x 22.9 cm. 23 kg is 50.7 lb, 7 kg is 15.4 lb and 10 kg is 22 lb. Round DOWN when converting a limit: a 55 cm limit is 21.65 inches, not 22.

Limits change; confirm with your airline before you fly. Every figure here links to the airline page it came from.

Luggage size converter: cm, inches, kg and lbAirline-published limits
In inches 21.65 x 15.75 x 9.06 in
Total (L + W + H)46.46 in
Weight23 kg = 50.71 lb

When the result is a limit, keep the decimals. A 21.65 inch limit does not accept a 22 inch bag.

How it works: 1 inch = 2.54 cm exactly; 1 kg = 2.20462 lb

Converting a limit and rounding up is how a bag that "fits" by the box label fails a metric sizer. Compare in the airline's own unit.

Carry-ons with published outside dimensions

Frequently asked questions

What is 55 x 40 x 20 cm in inches?

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.

What is 23 kg in pounds?

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.

Researched, not professional advice. Airline limits and fees change; confirm with your airline before you fly.

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