Start with the whole recipe
A pour-over ratio compares dry coffee with the total water poured through it. A recipe using 18 grams of coffee and 300 grams of water is approximately 1:16.7. The bloom is part of that 300 grams, not an additional allowance. Filter-rinsing water is separate and should be discarded before you start measuring brew water.
A starting point around 1:16 or 1:17 is convenient for many hot filter recipes. Stumptown, for example, uses about 1:17 in its pour-over guidance. Different coffees and complete brewing methods can work at other ratios. Use the number to create a repeatable baseline, then evaluate the resulting cup.
Use a dose table
Choose an amount of coffee that suits the brewer and the drink you want, then calculate the water. Use these amounts to calculate your starting recipe. A 1:15 cup is not automatically sweeter, nor is a 1:17 cup automatically sour. Grind, water, roast, and how evenly the bed is brewed still matter.
| Coffee dose | 1:15 | 1:16 | 1:17 |
|---|---|---|---|
| 12 g | 180 g water | 192 g water | 204 g water |
| 15 g | 225 g water | 240 g water | 255 g water |
| 20 g | 300 g water | 320 g water | 340 g water |
Turn pours into cumulative targets
Cumulative targets tell you what the scale should show after each pour. Suppose an illustrative 18-gram, 300-gram recipe uses 54 grams for its bloom and divides the remaining water into two equal pours. Each main addition is 123 grams, so the scale targets are 54, 177, and 300 grams. Choose pouring times from the complete recipe you intend to follow.
Writing both the amount added and the total target makes a recipe easier to follow. Keep the timer running across bloom, pouring, and drawdown. Resetting the scale between pours changes how the instructions must be read and can make a familiar recipe unexpectedly confusing.
Adjust the right problem
If the flavor is balanced but the drink feels too intense, first test a small amount of water added to the finished cup. That can help separate a concentration preference from a brewing problem. If the diluted sample tastes better, a slightly longer brewing ratio may be worth trying next time, although changing brew water can also change extraction.
If the coffee is both weak and unpleasantly sharp, increasing the dose is not the only option. Check saturation, grind, and pouring consistency first. Similarly, a drying finish is not proof that the ratio contains too much water. Describe the whole result before reaching for a correction.
Account for ice and larger batches
An iced pour-over needs two water quantities: hot brewing water and ice intended to melt into the drink. Its hot-water ratio will look much stronger than its total-water ratio. Keep ice out of the hot-water scale targets, and state both quantities clearly.
For a larger hot brew, preserve the ratio initially while checking the dripper's capacity. More coffee changes bed depth, so the same grind and number of pours may no longer behave the same way. Compare the larger batch with your original cup by taste and record how its finish time changes.