It is very hard to say now because the Royal Mail go on size as well as weight.
I recently sent some Christmas cards to the states and it cost me £1.36 each one (the same price as the flippin' card )
With our business we send a lot of internet orders out so we use the post office a lot and have found that it's not really worth trying to guess when posting as usually it's wrong!
Uk large letter prices are:-
A4 up to 100g is 52p 1st class or 42p 2nd class
A4 up to 250g is 78p 1st class or 66p 2nd class
A4 up to 500g is £1.08 1st class or 90p 2nd class
A4 up to 750g is £1.57 1st class or £1.31 2nd class.
Airmail prices vary by destination and weight.
Letters to the Rest of the World (not Europe) :-
10g 56p
20g 81p
40g £1.22
60g £1.64
80g £2.08
100g £2.52
120g £2.94
140g £3.38
160g £3.81
180g £4.24
200g £4.68
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