Coffee-to-Water Ratio: A Simple Brewing Guide
Brew Better Coffee
Coffee ratios sound technical, but they are simply a repeatable way to answer one question: how much coffee should I use for this amount of water? A ratio of 1:16 means one gram of coffee for every 16 grams of brewing water. Because one milliliter of water weighs almost one gram, a scale makes the math easy.
Our Starting Point: 1:16
For most manual and drip brewing, 1:16 is a very good place to begin. It is not a universal rule. A 1:15 recipe uses more coffee and can produce a more concentrated cup; 1:17 uses less coffee for the same water and can taste lighter. Extraction, however, also depends on grind, contact time, temperature, agitation, and the coffee itself.
Quick Ratio Chart
At 1:16: 250g water = about 15.6g coffee; 350g = about 21.9g; 400g = 25g; 500g = about 31.3g; 750g = about 46.9g; 1 liter = 62.5g. For common finished beverage sizes, remember that the brewer retains some water, so a 12-ounce cup does not necessarily mean exactly 12 ounces of brewing water.
What About 1:15 and 1:17?
For 400g water, 1:15 uses about 26.7g coffee, 1:16 uses 25g, and 1:17 uses about 23.5g. Those small differences are noticeable. Rather than treating one ratio as 'correct,' choose a repeatable starting point and let taste tell you where to go next.
Ratio by Brewing Method
Pour-over and automatic drip often land comfortably around 1:15 to 1:17. Immersion methods such as French press can work in the same neighborhood, although recipes vary. Espresso is a different conversation because we normally discuss the relationship between dry coffee dose and liquid espresso yield rather than total brewing water.
How to Adjust
If a cup feels too weak, do not automatically add more coffee. First ask whether it also tastes sour or hollow, which may point to under-extraction and a grind adjustment. If it is well extracted but simply less concentrated than you prefer, then changing the ratio makes sense. Change one thing at a time so you know what actually improved the cup.
Why Weigh Coffee and Water?
Scoops and volume measurements vary. Coffee density changes with roast level and bean size. A scale removes that uncertainty and makes a good brew repeatable. You do not need laboratory precision; you need consistency.
Start at 1:16, keep a note of what you changed, and build the recipe around the coffee in front of you.
Keep Exploring
Choose a GRC coffee, weigh your dose, and start at 1:16. Adjust from there based on taste.