Get a piece of wrapping paper out of the closet and draw it out on the white back side...
Draw the whole string deal from bridge to saddle and you will see clearly what you need to to... Don't forget to include your body joint location and your sound hole.
Then - as Bruce says - add another 1/8" for the offset on both sides and there you go. Now - you can lay out your neck and fretboard as well as your saddle slot and bridge pin spacing. You will have a much lower risk of ending up with a string spacing 1/4" wider at the saddle than you planned....
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