With COVID-19 lockdown continuing I have been using the time to improve my coffee brewing.
Mainly espresso and pour over, but even the odd French press (cafetière).
Coffee recipes are often expressed in various terms, scoops of coffee to cups of water, or fluid ounces (often not explaining whether American or imperial). Oh and what is a cup. In Europe a cup of coffee can be anything from a 4 Oz to a 6 Oz cup. In America in fact the west in general it just seems to keep getting bigger. The biggest issue with measuring volume is the fact that different coffee can have more volume than other, plus it depends on grind size.
Most common now is a ratio by weight, for espresso 1:2, one part coffee to two parts output. So for example 14 grams of coffee (an Italian double), and have 28 grams of espresso.
For pour over 1:15 is often the starting place. So one part of coffee to fifteen parts of water.
So ratio by weight is better but who wants to do maths before making coffee, I much prefer grams of coffee per litre of water, a litre of water being 1000 grams.
As a general rule I start at around 60 g per litre for a pour over and maybe a little more for a French press depending on how I am feeling. It makes the calculations easy, a large mug is generally 250 ml so four mugs is a litre, 30 g for two mugs, 15 g for one mug. Also I grind a little finer for a V60 when making amounts up to 250 ml, a little courser for my Kalita Wave, and courser still for my Chemex when brewing over 400 ml.
Knowing that 1 g equals 1 ml of water you can figure out the size of your favourite coffee cup and using the grams per litre measure quickly make yourself a cup of quality coffee first thing in the morning.