The best brew ratio for coffee pour overs can vary depending on personal preference, but a commonly recommended starting point is a 1:15 coffee-to-water ratio. If you are using 225 grams of water to make a cup of coffee, use 15 grams of coffee to achieve this ratio. Ratios of 1:13 to 1:16 are widely used by baristas, depending on the roast level and coffee bean used.