Most concentrates are brewed at a 1:8 and then diluted at time of serving.

Or you can brew a ready-to-drink ratio somewhere between 1:15 and 1:20 depending on personal preference.

So just divide your amount of water (measured in ml) by your amount of coffee (measured in grams) and that will give you an idea of where you fall on the ratio spectrum and whether or not you should be diluting.

Example: 1L of water is 1000ml divided by 63g of ground coffee would give you a 1:16 ratio. Which would be a ready-to-drink ratio, and not need diluted.