Coffee Brew Ratio Calculator

The widely recommended "golden ratio" is 1:16, meaning 1 gram of coffee for every 16 grams (or milliliters) of water. This produces a balanced, flavorful cup for most drip and pour-over methods. However, the best ratio depends on your brew method and personal taste. French press drinkers often prefer 1:14 for a fuller body, while espresso uses a concentrated 1:2 ratio. Start with the standard for your brew method and adjust from there.

A standard guideline is about 2 tablespoons (roughly 10-11 grams) of ground coffee per 6-ounce cup of water. If you prefer stronger coffee, use a slightly heaping tablespoon; for lighter coffee, use a level tablespoon. Keep in mind that a "cup" in coffee terms is 6 ounces, not the 8-ounce measuring cup you might be used to. Using a kitchen scale for grams will give you the most consistent results.

The Specialty Coffee Association (SCA) defines the golden ratio as 1:18 (55 grams of coffee per liter of water), though many coffee enthusiasts prefer a slightly stronger 1:15 to 1:17 range. The golden ratio is a starting point, not a rule. Your ideal ratio depends on the bean origin, roast level, grind size, brew method, and personal preference. Use this calculator to experiment and find your perfect cup.

Grind size directly affects extraction. Finer grinds expose more surface area, extracting flavors faster and producing a stronger, more intense cup. Coarser grinds extract more slowly, resulting in a lighter, smoother brew. This is why espresso uses a fine grind with a short brew time, while French press uses a coarse grind with a longer steep. Using the wrong grind size can lead to over-extraction (bitter, harsh taste) or under-extraction (sour, weak taste).

A 1:15 ratio uses more coffee relative to water, producing a stronger, bolder cup. A 1:17 ratio uses less coffee, resulting in a lighter, more delicate brew. The difference might seem small, but it is noticeable. For example, brewing 300ml of water at 1:15 requires 20g of coffee, while 1:17 requires about 17.6g. If your coffee tastes too watery, try moving to a lower ratio number (more coffee). If it tastes too intense or bitter, try a higher ratio number (less coffee).