Pour-Over Coffee Water-to-Ground Ratio Guide! How Much Water for 15g of Coffee Grounds? What is the Coffee Ground-to-Water Ratio?

Understanding Coffee Ratios: The Key to a Better Brew

The coffee-to-water ratio is one of the most important parameters in brewing, referring to the weight ratio of grounds to water. A 1:10 ratio, broadly speaking, means 1 gram of coffee grounds to 10 milliliters of water. Since this ratio directly shapes the taste and texture of the cup, learning to find the right one is a core part of brewing well. It is also one of the questions our store hears most often: "What should the coffee-to-water ratio be for pour-over?"

Finding a good ratio isn't hard, but first we need to understand what the ratio actually affects.

How the Coffee-to-Water Ratio Affects Coffee

Arguably the biggest effect of the ratio is on concentration, something no other parameter can deliver in the same way. With everything else held constant, the smaller the ratio, the lower the concentration; the larger the ratio, the higher the concentration. That can be hard to picture, so here is an experiment FrontStreet Coffee ran earlier: with all other parameters fixed, including time, we brewed three pots at 1:10, 1:15 and 1:20 and measured them with a concentration meter. The results came out at 1.93%, 1.35% and 1.04%. Clearly, the more water we use, the lower the concentration becomes.

Concentration refers to the proportion of coffee solids to water in the cup. The higher the concentration, the greater the share of dissolved coffee solids, and the reverse is also true. Those solids are the main source of coffee's flavor and aroma, so we can say that a higher concentration means more intense flavor and aroma. Combined with what we just covered about the ratio, that leads to a simple conclusion: use a larger ratio during extraction, and the concentration rises; the higher the concentration, the stronger the coffee, and vice versa.

If the standard for the "best" ratio is simply your own taste, then all you need is the ratio that brews coffee you enjoy. If you like it strong, choose a larger ratio for a flavorful cup; if you like it light, choose a smaller one for a milder cup.

As a reference, FrontStreet Coffee says this: whether for daily store production or for the brewing shared in these articles, we mostly use a 1:15 ratio. Coffee brewed at 1:15 is neither too strong nor too weak, a concentration most people find appealing. Use that as your baseline. If you prefer a stronger cup, push the ratio to 1:13-1:14; if you prefer it lighter, ease it back to 1:16-1:17. But avoid the extremes. Coffee that's too strong becomes so concentrated in flavor and aroma that it turns off the palate, while coffee that's too weak shows far less flavor and aroma and tastes more like coffee-flavored water, with a very thin texture.

There is more. The amount of water affects not only concentration but also the extraction rate, because water is the solvent that pulls flavor out of the coffee. With other parameters unchanged, more water dissolves more compounds, and less dissolves fewer. Water volume also affects extraction time: at the same flow rate, different volumes take different times to pour, and a longer extraction dissolves more flavor compounds. Combining these two points, we can see that the amount of water drives the extraction rate, and extraction rate has a widely accepted delicious range of 18%-22% in the golden cup standard (not absolute, but a useful reference). To keep the extraction rate inside that range while changing the water volume, we need to adjust other parameters too. That way we can brew a pot with both a suitable concentration and a suitable extraction rate. FrontStreet Coffee's parameters when brewing light roast coffee are 15g of coffee, a 1:15 ratio, 92°C water, EK43 setting 10 and an extraction time of 2 minutes. If we want to shift the ratio to 1:10 for a stronger cup, we then need to grind finer, raise the brewing temperature or extend the extraction time. Only then can the coffee reach a sufficient extraction rate, ensuring that even at high concentration it still blooms with the same delicious flavor.

FrontStreet Coffee Recommendation

Ratio changes are easiest to read on a clean, well-structured light roast, and FrontStreet Yirgacheffe Gedingding is exactly that. With its white jasmine florals, bright citrus and lemon acidity and tea-like sweetness, it shows very clearly how a shift from 1:15 to 1:13 or 1:17 changes the balance of the cup.

If you want a bean that stays sweet and juicy across a wider range of ratios, try FrontStreet Ethiopia Huakui. Its tropical fruit and strawberry aromas, low bitterness and rounded, fruity body make it forgiving of small adjustments, so you can dial in concentration without losing its character. For pour-over, FrontStreet Kenya Cherry Tomato is another option: a light-roasted Kenyan washed coffee with memorable cherry-tomato and dried-plum acidity and a full, juice-like body.