Per Wolf Tooth Components, a BCD is the diameter of a circle that passes through the center of all bolt holes on the circle. (This assumes that all bolts in question are equidistant from the crank spindle axis. As I recall, there are a very few odball cranks for which this isn't the case.) So the distance from the center of the crank spindle axis to the center of a bolt hole on a 130mm BCD crank would be 1/2 (130), or 65mm.

Per Chain Reaction Cycles, the outer nut of a chainring bolt has an outside diameter of 10mm. So the distance from the center of the crank spindle axis to the outer edge of a chainring bolt hole for a 130mm BCD crankset would be 65mm + 1/2 (10mm), or 70mm.

Not sure how wide the overhang/flange at each end of a chainring bolt is. If you're looking for the distance to the outer edge of that overhang/flange, you'll need to determine and add that distance as well.