Just print one - then see how it came out. If it needs to be bigger , make it a bit bigger.
Once you've done a couple you'll figure out the right setting.
This is how I did it. The nice thing is you don't need to print out an entire map on large paper to get the size right, just print a portion of it on regular size paper and measure the squares. If they're off a bit then reprint at a different scale, rinse and repeat. Once you find the scale is perfect (or close enough) print out the entire map on the paper size you want.
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So, what I've been doing is a little different. Especially because a lot of the maps floating around - as awesome as they are - don't have a battle grid on them.
So, what I do is set up an Excel file with 1" columns and 1" rows, and turn all gridlines on.
Then I import the image of the battle map. This is easy if you have an older version of Excel, because you can directly manipulate the image. If you have a more recent version of Excel, you need to draw a shape, then use the image of the battle map as the fill of the shape.
Then it's just a matter of stretching it out and (in my case) setting the transparency to about 30% so the gridlines show through.
The nice thing about doing this in Excel is that when I print it (I don't have access to a large-format printer), it automatically cuts the image into tiles, and the gridlines make it relatively easy to line the pieces up.