Why Your Pour-Over Is Stuck at 1:15 and How to Fix It

The Question: Should You Follow the SCA's 1:16–1:18 Ratio, or Go Stronger?

Here's a number that should make every home brewer pause: the Specialty Coffee Association's Golden Cup standard recommends 55 grams of coffee per liter of water, which is roughly a 1:18 ratio (SCA). But walk into any specialty café and ask for their pour-over recipe, and you're likely to hear something like 1:15 or even 1:14. Why the disconnect? The SCA's number is a baseline for cupping—a controlled environment meant to evaluate beans, not to brew your morning cup. The real question isn't “what ratio should I use?” but “how do I get to 18–22% extraction without overdoing it?” (SCA).

The Golden Cup Is a Target, Not a Rule

The SCA's Golden Cup standard is built on two numbers: extraction yield between 18–22% of the dry coffee mass and a TDS (total dissolved solids) of 1.15–1.35% in the final cup (SCA). These are the boundaries of a well-brewed coffee—under 18% and you're leaving flavor behind (sour, weak), over 22% and you're pulling bitter, astringent compounds. But the ratio needed to hit that window depends on your equipment, your grind, and your water. The SCA's 1:16–1:18 range is a good starting point, but many baristas push toward 1:15 to get more intensity and body, especially with lighter roasts that need more extraction to unlock their sweetness.

Why We Brew Stronger: The Case for 1:15

In our experience, a 1:15 ratio (about 60 grams of coffee per liter) is a more practical default for pour-over. Why? Because most home grinders produce a wider particle size distribution than a commercial grinder, so you get more fines that over-extract and more boulders that under-extract. A slightly stronger ratio gives you a buffer: even if your extraction is a bit uneven, the coffee will still taste balanced. Plus, the SCA's own tolerance allows up to 60 g/L (SCA), so 1:15 is within the official range. We're not saying ditch the Golden Cup—use it as a calibration tool. Brew a batch at 1:16 and one at 1:15, and taste them side by side. You'll likely find that the 1:15 has more sweetness and body, while the 1:16 tastes cleaner but thinner. That's not a failure—it's a preference.

The Real Variable: Grind Size and Contact Time

Here's where most people get stuck: they change the ratio but ignore the grind. The SCA recommends a contact time of 1–4 minutes for fine grind (pour over) (SCA). If you're brewing a V60 at a medium-fine grind, you should be in that 3–4 minute window (Roast Coffee Co. pour over). If your brew finishes in 2 minutes, your grind is too coarse—you'll under-extract. If it takes 5 minutes, it's too fine—you'll over-extract. The grind size chart maps method to grind: medium-fine for V60, medium for flat-bottom drip (Roast Coffee Co. grind size). So before you touch the ratio, dial in your grind so that your total brew time is 3–4 minutes. Then adjust the ratio to taste.

Water: The Invisible Ingredient

Even with the perfect ratio and grind, you can ruin a cup with bad water. The SCA's water standard calls for a TDS of 150 mg/L (range 75–250) and a pH of 6–8 (SCA Water Standard; SCA). Tap water that's too hard (high in calcium and magnesium) can make coffee taste chalky; too soft (low TDS) and it tastes flat. We recommend using filtered water or buying a jug of spring water with a TDS in that range. It's a simple fix that makes more difference than switching from a 1:16 to a 1:15. If you're serious about brewing, a $20 TDS meter can tell you what you're working with.

Putting It Together: A Concrete Example

Let's say you're brewing a 12-ounce cup (about 350 ml). At a 1:15 ratio, that's 23.3 grams of coffee. (At 1:16, it's 21.9 grams.) Start with 1:15, grind medium-fine (like table salt), water at 200–205°F (93–96°C) (Roast Coffee Co. pour over), and aim for a total brew time of 3:30. If it's too strong, dilute with a little hot water—but don't be afraid of strength. The SCA's target of 1.15–1.35% TDS is a guideline for competition; many people enjoy a stronger cup. The key is to hit that 18–22% extraction. If your coffee tastes sour, you're under-extracting—grind finer or increase the brew time. If it's bitter and dry, you're over-extracting—grind coarser or shorten the brew time. That's the whole game.

Our Recommendation: Brew at 1:15, Adjust from There

We're tired of people treating the Golden Cup ratio as gospel and then complaining that their coffee tastes weak. The SCA's numbers are a starting point, not a destination. For a home brewer with a decent grinder, we recommend starting at a 1:15 ratio, using water in the SCA's TDS range, and dialing in your grind to hit a 3–4 minute brew time (SCA). That will get you into the extraction zone more consistently than blindly following 1:16. Once you're there, experiment: go to 1:14 if you like bold, or 1:17 if you prefer a lighter body. But measure your extraction—use a refractometer if you have one, or just taste. The goal is to hit that 18–22% window (SCA) where coffee tastes its best. That's the real Golden Cup.

Sources

• SCA - https://sca.coffee
• SCA Water Standard - https://scaa.org/PDF/ST%20-%20WATER%20STANDARD%20V.21NOV2009A.pdf
• Roast Coffee Co. pour over - https://www.roastcc.com/learn/how-to-make-pour-over-coffee
• Roast Coffee Co. grind size - https://www.roastcc.com/learn/coffee-grind-size-chart