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About this tool
Check cabin and check-in bags against Thai Airways weight allowances, the 115 cm cabin rule and Americas piece-concept routes.
This checker tests your bags against Thai Airways' published cabin and check-in limits and reports how far over you are. Thai uses a weight concept on almost the whole network — a single allowance in kilograms, from 20 kg on the cheapest Economy fares up to 50 kg in Royal First, shared across every checked bag — and switches to IATA piece rules of 2 × 23 kg or 2 × 32 kg on journeys to and from the Americas. The cabin bag is judged against two rules at once: 56 × 45 × 25 cm per side and 115 cm for the three sides added together, so a case built to the maximum on every side measures 126 cm and fails.
Open Thai Airways Baggage Allowance Checker on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
The per-side triple and the 115 cm total are applied together, the way the airline states them.
Regional weight-concept sectors and Americas piece-concept sectors are handled separately.
Excess is priced at the rate you enter, since Thai's per-kilo charge varies sharply by route band.
On most routes it is a total weight covering all your checked bags together: around 20 kg on the cheapest Economy fares and domestic Thailand sectors, 30 kg on standard and flexible Economy, 40 kg in Premium Economy and Royal Silk Business, and 50 kg in Royal First. Flights to and from the Americas use piece rules instead — two bags of 23 kg in Economy and two of 32 kg in the premium cabins.
One piece up to 7 kg that fits within 56 × 45 × 25 cm and whose length, width and height add up to no more than 115 cm. Both tests have to pass, which catches a lot of luggage: a suitcase at the full 56 × 45 × 25 cm totals 126 cm and would be refused, so aim for roughly 55 × 38 × 22 cm or smaller.
Excess weight is charged per kilogram over the free allowance, at a rate set by route band, so the same extra 5 kg costs very different amounts on a domestic Thai sector and a long-haul European one. Buying extra weight in advance through Manage My Booking is normally cheaper than paying at the check-in counter — this tool takes the rate as an input so you can price your own sector.
On weight-concept routes, passengers travelling together on the same booking can normally have their allowances pooled at check-in, so a 22 kg bag and a 38 kg bag can clear a 2 × 30 kg pool. Pooling does not lift the 32 kg ceiling on any single piece, and it is granted at the airline's discretion, so confirm it at the counter rather than planning around it.
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