A typical laptop charger draws less than 1A at 240V, so a 1A fuse should be fine. The power draw for a charger will be written on the charger itself, of course; you'll see something like "Input: 100 - 240 VAC, 1.2 - 0.6A". In this case, the two numbers at the right go together, so at 100V the charger uses 1.2A, at 240V it uses 0.6A.
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