I’ve been collecting coffee/water ratios and experimenting on my own and I’ve decided that fifteen parts of water to one part of coffee is just about right for me, using a plain pour over method. Coffee recipes — that is, the proportion of coffee to water — are best expressed in weight not volume.
Here’s the data, all in grams:
That averages out to 1:15.1, so here’s a table with water volumes in the first column and three strengths, yielding grams of coffee at the intersection:
You effectively need about 400 grams of water for a 12 oz. cup of coffee. My wife and I split 500 grams in the morning, although at the 14:1 ratio.