Before a trip, checking whether your cabin bag is within the limit, or whether your checked suitcase stays inside the free allowance, means hopping between airline pages and comparing numbers. This tool lets you enter your bag's three sides (length, width, depth in cm) and weight (kg) once, then checks it against the rules of the main airline groups, showing for both carry-on and checked baggage whether it fits or is over (with the reason). It covers ANA and JAL domestic flights (the carry-on total differs between aircraft with 100+ seats and smaller aircraft under 100 seats) and international economy, the LCCs Peach, Jetstar and similar carriers (domestic and international), and the common international economy size used by many airlines. Carry-on is judged on three conditions — each side, the sum of the three sides, and weight — while checked baggage is judged in order: can it be checked at all (size and per-piece weight limit), then is it free or subject to an overweight fee. When a carrier has no free checked allowance, like an LCC, it shows "Paid (no free allowance)". The three sides can be entered in any order; the tool sorts them and matches each against the limits. Pick a common bag from "Example" (cabin S, medium/large suitcase, duffel, backpack) to fill the fields fast. The rules are a guide based on the main figures as of 2024; the exact free allowance varies by fare, route and elite status, so always confirm the latest rules via each card's "Official" link. The size and weight you enter are computed only inside your browser and are never sent to any server.