Coffee Brew Ratio Calculator

The ratio of coffee grounds to water is the single most important variable in brewing. The Specialty Coffee Association (SCA) established a recommended range of 1:15 to 1:18, with 1:16 as the golden standard. This ratio directly controls Total Dissolved Solids (TDS) and extraction yield. Too little coffee produces a weak, under-extracted cup with sour notes. Too much coffee leads to over-extraction, resulting in bitterness and astringency. Our calculator uses SCA-validated ratios tailored to each brewing method, so you get a balanced cup every time regardless of whether you brew with a V60, Chemex, AeroPress, French press, or espresso machine.

Different brewing methods require different ratios because of how water interacts with the coffee grounds. Immersion methods like French press use a 1:15 to 1:17 ratio because the grounds steep in water for the full brew time. Percolation methods like pour over (V60, Chemex) work best at 1:15 to 1:16 because water passes through the bed and extracts more efficiently. Espresso uses an extremely concentrated 1:2 ratio (dose to yield by weight) with pressurized water at 9 bars. Cold brew requires a strong 1:5 ratio because cold water extracts much less efficiently than hot water, and the concentrate is typically diluted before serving.

For repeatable results, always measure by weight using a digital kitchen scale accurate to 0.1 grams. Volume measurements (tablespoons, scoops) are unreliable because grind size, roast level, and bean density all affect how much coffee fits in a scoop. A tablespoon of finely ground dark roast weighs more than a tablespoon of coarsely ground light roast. Water should also be measured by weight: 1 millilitre of water weighs exactly 1 gram. Investing in a basic coffee scale (available for under 15 dollars) is the single best upgrade you can make to your home brewing setup.