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Coffee Brew Ratio: How Much Water Per Gram of Coffee

A coffee's strength comes down to one number: the ratio of coffee to water. Here is how to read and use it.

1:15 to 1:18 is the common specialty range

For every 1 gram of coffee, specialty coffee generally uses 15 to 18 grams (roughly the same in mL) of water. Lower numbers like 1:15 make a stronger cup; higher numbers like 1:18 make a lighter one.

The ideal ratio shifts by brew method

French press commonly sits around 1:15, drip and pour-over around 1:16-1:17, and cold brew concentrate is brewed much stronger, often 1:8, since it gets diluted with water or milk before drinking.

Weigh coffee in grams, not scoops

A tablespoon or scoop of coffee varies significantly in weight depending on roast level and grind size, so a ratio only stays accurate when both coffee and water are measured by weight on a scale.

Water temperature matters almost as much as ratio

Most methods target 195-205Β°F (90-96Β°C), just off a rolling boil. Water that is too cool under-extracts and tastes flat; water that is too hot can pull out bitter compounds.

The bloom is a small first pour, not part of the main ratio

Pre-wetting the grounds with about twice their weight in water and letting it sit 30-45 seconds releases trapped CO2 from roasting, which helps the rest of the water extract more evenly.

Why ratio matters more than the scoop

A rounded scoop of a light, dense roast can weigh noticeably more than the same scoop of a dark, airy roast, which throws off strength even when someone thinks they're using 'the same amount' every time. Measuring by weight is the only way to make a ratio repeatable across different beans.

Espresso runs on a different logic

Espresso ratio (commonly around 1:2, like an 18g dose producing 36g of liquid out) measures the shot's output against the dose, not total brew water, because espresso is a concentrated, pressurized extraction rather than a full-immersion brew.

Frequently Asked Questions

What ratio makes the strongest coffee without turning bitter?

Around 1:15 is close to the strong end that most people still find balanced. Going noticeably tighter than that tends to risk over-extraction and bitterness rather than simply tasting stronger.

Does the ratio account for grind size too?

No. Ratio only controls concentration. Grind size controls how fast water extracts flavor, and it needs to be adjusted separately for each brew method regardless of what ratio you use.