What defines scale length?

[Little Pigbacon]

I know what it means in the rough sense, but when you consider the staggered saddle positions on a guitar I recently bought, the closest string is about 24-3/4" and the farthest string is right about 25". How do you decide the nominal scale length, as you might publish it in a catalog?

 

[Silence Kid]

Re: What defines scale length?

Twice 12th fret to nut.

 

[Little Pigbacon]

Re: What defines scale length?

Twice 12th fret to nut.

Thanks! 24-3/4" it is.