This is largely based on your personal preferences. Some people prefer a 1:16 ratio of coffee to water while other people will like something more or less. The guidelines for balancing your ratio are based on brew time and grind size. A smaller grind produces a stronger coffee, so you don’t need as much coffee to get a strong flavor. A coarse grind extracts flavor more quickly but it won’t be as strong, so you’ll need to use more grounds to get the strength you want. Above all, you need to do what tastes good to you. Experiment with different ratios until you find the right one for you.