16.54 in.
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By unit of length and distance and conversion ,we can say that 1 m =0.03930 in 420 mm=16.53 in
1 mm = 0.03937 inch Multiply your numbers by that to convert them.
420mm is bigger.
The size of A3 paper is 420mm x 297mm
420mm x 594mm or 42cm x 59.4cm