Thanks Mike and Dick, both answers were what I was looking for.

Don

> > What would be the SG formula for dilution? If I had 5 gallons
> > of 1.050 and added 0.5 gallons of water, how would I calculate
> > the resulting SG?
>
> Simple way to look at it is that 1.050 means you have 50 points
> per gallon. Given 5 gallons, you have a total of 250 points.
> When you add 1/2 gallon of water, you still have the 250 points,
> but now they are spread across 5.5 gallons.
>
> 250 points / 5.5 gallons = 45.4545... points per gallon.
> So your new SG is 1.0455.
>
> Dick