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A repeatable pour-over ratio begins with knowing exactly what you are measuring. The coffee dose is the dry grounds added to the brewer. The water amount is all the brewing water poured onto them, including the bloom. Keeping those definitions fixed prevents a common source of confusion: two people can claim the same ratio while actually measuring different parts of the process.

Write the recipe in grams

Choose a dose that suits your brewer and normal serving. For example, 20 grams of coffee with 320 grams of brewing water gives a ratio of one to sixteen.

The calculation is straightforward: multiply the coffee mass by the water number in the ratio. At the same ratio, 15 grams of coffee needs 240 grams of water, and 25 grams needs 400 grams.

Use those numbers as an arithmetic example, not as proof that every batch will taste identical. A larger bed can drain differently, so scaling also needs a practical check in the brewer.

Establish a clear scale routine

Place the server and brewer on the scale, insert the filter, and rinse it if that is part of your method. Discard the rinse water before measuring the coffee or starting the brew.

Add the grounds and confirm their mass. Then tare the assembled setup so the display starts at zero for water. This makes the final target easy to see.

If the whole setup is too heavy for the scale, use a different measuring arrangement that stays within its capacity. An overloaded scale can be inaccurate or unstable, undermining the very consistency you are trying to create.

Count the bloom correctly

If your target is 320 grams and you begin with a 50 gram bloom, you have 270 grams left to pour. The bloom is not an extra allowance outside the recipe.

Write cumulative pour targets if you use several stages. For instance, noting the display values you intend to reach is easier than doing subtraction while holding a kettle.

Keep the targets simple enough to remember. A repeatable recipe does not require a complicated series of tiny pours, particularly when each additional stop changes agitation and heat loss.

Account for ordinary measurement errors

A scale may update a little after you stop pouring. Slow the stream as you approach the target, then allow the reading to settle. Do not repeatedly add tiny splashes in response to a display that is still catching up.

Check that the kettle or your hand is not touching the brewer or scale during measurement. Accidental contact changes the reading and can make a correct pour appear short.

Avoid taring midway through the brew unless your written method explicitly accounts for it. Losing the cumulative water total is an easy way to produce an unintentional ratio.

Record what actually happened

Write down the real final water mass, not only the planned target. A small overshoot is usually not a disaster, but knowing it happened helps explain differences between cups.

Record the grind setting and approximate brew time alongside the ratio. Those details let you distinguish a measurement problem from a change in drainage.

When a recipe tastes good, repeat it several times before refining it. If the results vary despite consistent weights, inspect pouring coverage, filter seating, and bean condition.

The ratio becomes a useful anchor once the arithmetic and scale sequence are automatic. You can then adjust flavor deliberately, confident that “20 to 320” means the same thing each morning rather than a loosely remembered amount of coffee and water.