Coffee to Water Ratio: Calculator and Brew Guide

The standard coffee-to-water ratio for filter brewing is 1:15 to 1:17: one gram of coffee for every 15 to 17 grams of water. 1:15 brews strong, 1:16 is the most common specialty starting point, and 1:17 runs lighter. The SCA Brewing Control Chart sets its reference point at 1:18.2 (±55 g/L), but most specialty brewers land at the stronger end of that range. Use the preset for your brew method as a starting point and adjust one notch to taste.

There is no single best: it depends on the method. Pour-over and Chemex sit around 1:16 to 1:17. French press lands closer to 1:15. AeroPress runs anywhere from 1:12 (concentrated, dilute later) to 1:17 (standard). The SCA Brewing Control Chart targets 55 grams of coffee per litre of water (about 1:18.2), ± 10%, for filter coffee, but most specialty brewers land at the stronger end of that range. Start with the preset for your method and adjust one notch stronger or lighter to taste.

There is a standard reference range, not a single ratio. The SCA Brewing Control Chart targets 55 grams of coffee per litre of water (about 1:18.2) as the centre of the filter brewing band, with a ± 10% tolerance that puts the full range at roughly 1:16 to 1:20. Most specialty brewers work at the stronger end of that range (closer to 1:15 to 1:17) because the chart was developed around mass-market equipment and broader palate preferences.

A “cup” varies. The US measuring cup is 8 fluid ounces (about 237 grams of water); the historical SCA “coffee cup” used in the 2-tablespoons-per-6-ounces heuristic is 6 fluid ounces (about 177 grams). For a single 8-ounce cup at a pour-over ratio of 1:16, you want about 15 grams of coffee. For a single 6-ounce cup, about 11 grams. Use the calculator above to pick the cup size you are using.

The old rule is two tablespoons of ground coffee per 6 ounces of water. That works out to roughly 1:17 by weight, which sits inside the standard band: but tablespoons of ground coffee vary by 30 to 40 percent in mass depending on the grind and the bean, so the answer is approximate. If you have a scale, use grams; if you don't, two level tablespoons per 6 ounces is a sensible starting point.

Both are inside the typical pour-over band; the difference is taste. 1:15 will pull more body and a stronger cup; 1:16 leans cleaner and brighter. A common specialty V60 recipe targets 60 g/L (1:16.67). Our default is 1:16.5 because that splits the middle between 60 g/L specialty recipes and the SCA Brewing Control Chart reference, and rounds cleanly for whole-cup math. Try both with the same coffee and trust your palate.

Yes: and the bigger split is between cold brew styles. Ready-to-drink cold brew sits around 1:15, similar to hot brewing. Cold-brew concentrate runs 1:5 to 1:8 and is meant to be diluted 1:1 with water or milk before drinking. If you brew a 1:6 cold brew and drink it straight, you'll find it overwhelmingly intense; the ratio is correct, the dilution step is the missing piece.

Keep the ratio constant and multiply both numbers. A 30 g / 500 g pour-over scales to 60 g / 1000 g for a one-litre carafe. The catch: longer brews need a slightly coarser grind and a little more time. Type the new dose or yield into the calculator above: the ratio stays steady while the absolute amounts move.

You can approximate with tablespoons: about 5 to 7 grams per level tablespoon of medium-ground coffee. It's the easiest way to get into the right neighbourhood. For repeatable results, a $15 digital scale with 0.1 g resolution is the single best upgrade most home brewers can make.