LUGGAGE CALCULATOR
Compare centimetres, inches, kilograms and pounds, then calculate linear size and approximate volume.
Enter dimensions and weight to compare metric and imperial results.
Airline limits vary by route, cabin and fare. Always check the operating airline's latest rules.
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READ BEFORE YOU GO
How it works, examples, limits and sources behind the tool.
Linear size (also called linear inches when you work in inches) is length + width + height. Approximate volume treats the bag as a box (length × width × height) with 1 litre = 1000 cm³. The tool shows centimetres and inches (1 in = 2.54 cm) and kilograms and pounds.
Type the packed measurements, including wheels and handles. A soft bag that compresses should be measured as you will carry it, not as the empty shell in the product photo.
Many checked-bag rules cap linear size at 158 cm (62 in). Measure the longest side, the width, and the height with wheels and handles included, then add the three numbers. The calculator does that addition and the inch conversion so you can compare both units to the airline page.
Do not measure only the shell. A 70 cm case with 8 cm of wheels can already fail a 158 cm cap once width and height are added. If the airline publishes a size box instead of a linear cap, compare each edge, not only the sum.
A 55 × 40 × 20 cm carry-on is 115 cm linear and about 44 litres. IATA’s cabin reference is 55 × 35 × 20 cm (about 110 cm linear). If your case is 55 × 40 × 20, check every edge against the operating airline, not only the sum.
A checked bag of 75 × 50 × 30 cm is 155 cm linear — under a 158 cm cap — and about 113 litres. Weight is a separate limit (often 20–23 kg in economy). A bag can pass linear size and still fail on the scale.
Cabin bags are judged in a sizer at the gate; checked bags on linear size and weight at check-in. Low-cost fares (Ryanair, easyJet, Wizz) often include only an under-seat bag — a second cabin case is paid. Full-service economy usually includes one cabin case. This calculator does not know your fare: put the airline’s numbers next to the result.
Use it to see whether a case you own is closer to a cabin sizer or a hold limit. Under-seat caps are a third, smaller size (about 40×30×20 cm on Ryanair and Wizz, 45×36×20 cm on easyJet). For two-bag LCC fares versus weight or piece on Emirates and similar, read this site’s carry-on size and checked luggage guides.
Use it before you buy a bag, before you pack, and when an airline lists mixed units (cm on one page, inches on another).
Use it to compare two cases by volume only as a rough guide. Dividers and curved shells mean the litre number is not usable space.
Measuring one edge and ignoring linear size, mixing inches and centimetres, treating the printed litre rating as usable volume, and assuming the same airline’s limit applies to every fare.
Another is measuring the empty bag. Pack, then measure. Gate sizers catch the packed shape, including pockets you stuffed at the last minute.
55 × 35 × 20 cm follows IATA’s cabin recommendation. Real limits are the operating airline’s current rules for your ticket. Volume is a rectangular estimate and changes with shape, dividers and how a soft bag compresses.
The tool does not apply overweight fees or decide weight versus piece versus a paid add-on. Confirm the number on the airline’s baggage page for each leg.
Linear size is length + width + height, including wheels and handles. Many checked bags are capped at 158 cm (62 in) linear. Enter the packed bag, not the empty shell.
Measure each outside edge with wheels and handles, then add the three numbers. This calculator adds them and converts inches. If the airline uses a sizer instead of a linear cap, compare each edge.
No. The tool converts units and adds dimensions. Allowance depends on the operating airline and this ticket. Put the airline’s numbers next to the result.
Volume is length × width × height as a box. Curved shells, dividers and a compressed soft bag change usable space. Use litres to compare shapes, not as a packing guarantee.
Often not. Standard Ryanair, easyJet and Wizz fares usually include only an under-seat bag (about 40×30×20 or 45×36×20 cm). A 55 cm cabin case is a paid add-on. Full-service economy usually includes one cabin bag. Follow this ticket.