How do I calculate my brew ratio?

Calculating your brew ratio is the single most effective way to move from guessing to consistent, professional-level brewing. At its core, the brew ratio is simply the mathematical relationship between the mass of your coffee grounds and the mass of the water used to extract them. By using weight rather than volume—since coffee density varies significantly between roasts—you eliminate the guesswork that often leads to inconsistent cups.

For most manual brewing methods like pour-over, drip, or immersion, a ratio between 1:15 and 1:18 is the industry standard. To calculate this, decide on your desired water amount first. For example, if you want to brew 300 grams of water at a 1:16 ratio, you divide 300 by 16, which gives you 18.75 grams of coffee. If you prefer a stronger cup, you might move toward a 1:15 ratio; for a lighter, more tea-like body, a 1:18 ratio often works beautifully.

It is important to note that espresso requires a much more concentrated ratio, typically ranging from 1:2 to 1:3, due to the high pressure and fine grind size involved. Conversely, cold brew often utilizes a much higher coffee-to-water ratio, sometimes as concentrated as 1:8, which is then diluted before serving. These variations exist because different brewing methods interact with the coffee's surface area and contact time in unique ways.

Once you have established your baseline, treat the ratio as a starting point rather than a rigid law. If your coffee tastes sour or thin, you may be under-extracting; try increasing your coffee dose slightly or using a finer grind. If the cup is overly bitter or astringent, you might be over-extracting, suggesting you should use slightly less coffee or a coarser grind.

In practice, keeping a simple log of your ratios and the resulting taste will help you dial in your favorite beans. By mastering this brewing math, you gain the ability to replicate your perfect cup every morning, regardless of the specific origin or roast level of the coffee you are using.