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A repeatable pour-over ratio starts with two weights: dry coffee and total brewing water. The notation 1:16 means one gram of coffee for every 16 grams of water added to the brewer. It does not mean the finished cup weighs 16 times the dose, because the grounds retain water.

Turn the ratio into a recipe

Pick a dose that suits your brewer. For a single mug, 20 grams is a convenient example. Multiply by 16 to get 320 grams of total brewing water. At a 1:15 ratio, that same dose uses 300 grams; at 1:17, it uses 340 grams.

If you know the water amount first, divide it by the ratio number. A 400-gram water recipe at 1:16 needs 25 grams of coffee. Use a calculator once, write both weights down, and brew from those numbers instead of doing arithmetic beside a hot kettle.

Keep your normal serving size in mind. A mug that holds 12 fluid ounces does not automatically require 12 ounces of brewing water, especially if you want room for milk or safe carrying.

Measure only the water that enters the brew

Rinse the filter if that is part of your routine, then empty the rinse water. Add the coffee and put the brewer and server on a scale that can support their combined weight. Tare before beginning the brew.

Count the bloom as part of the total. If you bloom 20 grams of coffee with 60 grams of water, you have 260 grams left in a 320-gram recipe. Adding 320 grams after the bloom would quietly change the ratio.

Keep the kettle spout clear of the brewer and the server clear of nearby objects so nothing touches and distorts the scale reading. Check that the scale will not automatically turn off midway through a normal pour-over.

Write cumulative pouring targets

Cumulative targets are easier to follow than several separate additions. For example, write: bloom to 60 grams, pour to 180 grams, finish at 320 grams. You can see the next destination directly on the display.

Keep the pour pattern and waiting periods similar during the first few brews. A recipe is not truly repeatable if the ratio stays constant while the water alternates between one aggressive dump and six tiny pulses.

Record the grinder setting, filter type, and approximate finish time alongside the weights. These details make it easier to understand why a later cup differs.

Scale with the brewer, not just the calculator

Doubling 20:320 gives 40:640 mathematically, but a larger dose creates a deeper bed. It can drain more slowly and exceed a small dripper's capacity.

Use a brewer sized for the larger batch and adjust grind only after observing the result. Do not pour beyond the filter's safe capacity to keep a schedule. If the larger batch behaves poorly, two normal batches may be the more reliable choice.

Recover from a small measuring error

If you accidentally pour a little too much water, finish the brew and taste it before declaring it ruined. Record the actual amount if it differs enough to matter. Do not add dry coffee to a wet brewing bed to repair the arithmetic.

Once the method is consistent, adjust the ratio for your preferred strength and texture. This article's purpose is the measuring system: known dose, counted bloom, visible cumulative targets, and a recipe that another person could follow without guessing.