The proper way to measure coffee is by weight. If you are really serious about coffee, then investing in a scale that can weigh small portions of coffee accurately is a great choice. A good scale is indispensable when blending your own coffee in small amounts, unless you want to spend a lot of time counting coffee beans. Coffee can be measured by volume, but you lose a lot of accuracy because of varying bean densities and having to rely on visual estimation.
The proportion of ground coffee used in relation to the amount of water used is known as the brewing ratio. Experimentation will lead you to your own personal brewing and drinking ratios preferences. It is always wiser to brew your coffee on the strong side and then “cut” it to taste with water. If coffee is brewed too weak, all you can do is start over. Personal taste should be the sole basis for determining brewing ratios. It is very easy to misjudge a coffee that has been prepared using a brewing ratio that is not suited to your particular taste.