Just how much ground coffee do I need for x amount of coffee?
a. Whatever seems right to you.
b. It may change slightly from coffee to coffee and according to freshness.
c. What the Specialty Coffee Association of America (SCAA) has to say: A cup is defined as 6 ounces of water before brewing. This will produce 5.33 ounces of brewed coffee. Or 125 ml & 110 ml for Euro style coffee makersThe SCAA defines 10 grams or .36 oz per cup as the proper measure for brewed coffee if using the American standards. If using Euro standards the measure is 7 grams per 125 ml.To further confuse things I will add a few more measures:3.75 oz per 1/2 gallon55 grams per liter2.25 gallons per 1 lb.If you want to know more check the SCAA's web page at www.scaa.com.
d. According to "The Coffee Lover's Companion" by Diana Rosen, the standard is 2 tbs. per 6 oz of water. This to me seems very high but I have never tried it.
e. My personal taste is 1 "standard measure" per cup of coffee. A standard measure is approximately 1 tbs. this is a plus or minus equation depending on the coffee I am using, the degree of roast (darker = more coffee due to weight loss to keep the same weight per ounce) and the coffeepot I am brewing in. I believe this should be approximately in line with the SCAA's advice.
From the University of Waterloo (Ontario, Canada) website