Why Your Pour-Over Is Too Weak: The SCA Ratio You're Ignoring

Everyone talks about grind size and water temperature, but the real culprit behind a weak, sour pour-over is usually hiding in plain sight: the coffee-to-water ratio. The Specialty Coffee Association (SCA) Golden Cup standard calls for 55 grams of coffee per liter of water, with a tolerance of ±10% (SCA). That's roughly 1:16 to 1:18 by weight. But here's the contrarian truth: most home brewers are still underdosing. They follow the vague 'one scoop per cup' advice and end up with a thin, hollow brew that no fancy kettle can save.

This is a practical walkthrough for anyone who's tired of pouring money into specialty beans and getting mediocre results. We're going to dial in your ratio like a working barista would, using the Golden Cup targets as our guide. If you're already weighing your coffee and water, this will fine-tune your process. If you're not, you're about to see the light.

1. Weigh Your Coffee, Not Your Scoop

First things first: you need a scale. There's no way around it. The SCA ratio is expressed by weight, and eyeballing it just doesn't cut it. Start with 55 grams of coffee per 1000 grams (1 liter) of water. That's the Golden Cup sweet spot (SCA). If you're brewing a single 300 ml cup, that's 16.5 grams of coffee. Most people use 15 grams, and the difference is real.

What can go wrong: if you use a scoop, you might be getting 10 grams instead of 16.5. That's a 40% miss. The first time you weigh, you'll be shocked. Don't skip this step.

2. Adjust for Your Taste, but Stay in the Range

Once you've hit 55 g/L, taste it. If it's too strong or bitter, you can dilute it slightly, but the SCA allows a ±10% tolerance, so you can go down to about 50 g/L (roughly 1:20) without leaving the Golden Cup range. If it's too weak, you can go up to 60 g/L (about 1:16.7). Many professionals actually brew stronger, at 1:15 to 1:17, to get more flavor intensity (SCA).

My personal default is 1:16.5, which is right in the sweet spot. But if I'm brewing a light roast with bright acidity, I might nudge it to 1:15 to balance the acidity with more body. The point is to start at the standard and then adjust based on taste, not guesswork.

3. Grind for the Method, Not for the Machine

Now that your ratio is locked, let's talk grind. The grind size chart from Roast Coffee Co. is a lifesaver: for pour-over, you want a medium-fine grind (think table salt) if you're using a V60, or medium-coarse for a Chemex (Roast Coffee Co. grind size). If you're using a flat-bottom dripper like a Kalita, go medium. The idea is to match the grind to your brewer so the water flows through in the right time.

For a V60, the total brew time should be 3–4 minutes (Roast Coffee Co. pour over). If it's finishing in 2 minutes, your grind is too coarse. If it's taking 5 minutes, it's too fine. Remember, pre-ground coffee starts going stale within 15–30 minutes of grinding (Roast Coffee Co. grind size). So grind fresh, right before you brew.

4. Hit the Water Temperature and Contact Time

Water temperature is another piece of the puzzle. The SCA recommends about 200°F ± 5°F (roughly 93°C ± 3°C) at the point of contact with the coffee (SCA). For pour-over, Roast Coffee Co. suggests 200–205°F (93–96°C) (Roast Coffee Co. pour over). If you don't have a variable-temperature kettle, just boil and let it sit for 30 seconds.

Contact time matters too. The SCA recommends 1–4 minutes for a fine grind (which is what pour-over uses), 4–6 for medium (drip), and 6–8 for coarse (French press) (SCA). For your pour-over, aim for that 3–4 minute window. If you're hitting it, great. If not, adjust your grind.

5. Use the Golden Cup Targets to Fine-Tune

If you're a data nerd, you can measure your brew's strength and extraction yield. The Golden Cup targets are 1.15–1.35% total dissolved solids (TDS) and 18–22% extraction yield (SCA). These numbers are what professional baristas aim for. You can buy a TDS meter, but honestly, you can get close by taste. If your coffee tastes weak and sour, you're likely underextracted. If it's bitter and dry, you're overextracted.

What can go wrong: obsessing over numbers can ruin your enjoyment. Don't let perfect be the enemy of good. The Golden Cup is a target, not a law. The SCA's own tolerance is ±10%, so you have room to move.

What I'd actually do

Here's my no-nonsense advice: buy a scale, use 55 grams per liter as your starting point, and adjust from there. Grind medium-fine if you're using a V60, and brew with water just off the boil. Taste, adjust, and repeat. In less than a week, you'll have your ratio dialed in. And if you're still getting weak coffee, don't blame the beans—blame your dose.

Sources

• SCA - https://sca.coffee
• 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