The 1:16 Myth: Why Your Pour Over Should Be 1:15 and Not a Gram More

You type into the search bar: “best coffee to water ratio pour over.” The internet says 1:16. Your friend says 1:17. The bag of beans says 1:15. Which is it?

Here’s the thing: there is no single “best” ratio. The Specialty Coffee Association (SCA) Golden Cup standard gives a range, and that range is wider than most people think. The SCA recommends 55 grams of coffee per liter of water, with a ±10% tolerance. That works out to roughly 50 to 60 grams per liter, or a coffee-to-water ratio of about 1:16 to 1:18 by weight. But many professionals brew stronger, at 1:15 to 1:17. So the “golden ratio” is really a moving target.

In our shop, we’ve settled on 1:15 for most pour-over coffees. Not because the SCA is wrong, but because 1:15 gives you a cup that hits the sweet spot of strength and extraction without tipping into bitterness. Let’s walk through a concrete scenario to show you why.

Imagine You’ve Just Bought a Bag of Specialty Coffee

Say you’ve just dropped $20 on a bag of Ethiopia Yirgacheffe from a local roaster. It’s a light roast, scored 88 on the SCA scale (Roast Coffee Co. specialty). You want to taste the blueberry and jasmine notes the roaster promised. You’re going to brew it as a pour-over, probably with a V60, because that’s the classic method for showcasing delicate flavors.

You pull out your scale, your gooseneck kettle, and your grinder. The first decision: how much coffee and water? If you follow the blanket advice of “1:16,” you’d use 20 grams of coffee to 320 grams of water. But here’s why we’d nudge you to 1:15 instead: 20 grams of coffee to 300 grams of water.

The Numbers Behind the Ratio

The SCA Golden Cup target for brewed strength is 1.15–1.35% total dissolved solids (TDS). That’s the percentage of the final beverage that is coffee solids. The extraction yield—the percentage of the dry coffee mass that ends up in your cup—should be between 18% and 22%. These two targets are what really matter. The ratio is just a lever to get you there.

When we brew a light roast at 1:15, we typically land right in the middle of the TDS range. At 1:16, the cup often comes out a touch weaker, dropping below 1.20% TDS, which can make the coffee taste thin and tealike. That’s not what you want from a $20 bag.

The Grind and Water Temperature Make or Break It

But ratio alone won’t save you. The SCA recommends water at about 200°F ±5°F (roughly 93°C ±3°C) at the point of contact with the coffee. For a light roast, we usually push the high end, aiming for 205°F, to help extract those fruity acids. The grind should be medium-fine, like table salt, and the total brew time should be 3 to 4 minutes (Roast Coffee Co. pour over).

If you grind too coarse, the water runs through too fast, under-extracting and leaving sour, grassy flavors. Grind too fine, and you risk over-extracting, bringing out bitterness. The grind size chart from Roast Coffee Co. maps medium-fine to V60 pour-over, so that’s our starting point.

Why Light Roasts Need a Little More Push

Light roasts are denser and less porous than darker roasts, so they’re harder to extract. They’re roasted to around 180–205°C (356–401°F), stopped at or just after first crack (Roast Magazine). That means the bean structure hasn’t broken down as much, and the sugars haven’t caramelized as deeply. To get a pleasing extraction, you often need a slightly higher ratio of coffee to water—i.e., a stronger brew—to compensate.

In our experience, a 1:15 ratio gives light roasts enough coffee solids to balance the acidity. A 1:16 might work for a medium roast, which is more forgiving, but for light roasts, 1:15 is our go-to.

What About the “Golden Cup” Standard?

The SCA Golden Cup standard is a great baseline, but it’s not a law. It’s based on a specific brew method and a target audience of “typical” coffee drinkers. Many professionals prefer a stronger brew, at 1:15 to 1:17, as the SCA itself notes. So when you see “1:16” repeated everywhere, remember that it’s just one point within an acceptable range.

Also, the SCA’s contact time guidelines recommend 1–4 minutes for fine grind (pour over), 4–6 for medium (drip), and 6–8 for coarse (French press). That’s a wide window, and your actual brew time will depend on your grind size and pour technique. Don’t obsess over hitting 3:00 exactly.

Putting It Into Practice: A Step-by-Step Scenario

Let’s get concrete. You have 20 grams of coffee ground medium-fine. You heat 300 grams of water to 205°F. You place your V60 on your mug, add the filter, rinse it with hot water, and dump the rinse. Add the coffee, level it, and start your timer. Pour 40 grams of water to bloom, wait 30 seconds, then pour in slow spirals until you reach 300 grams total. Aim for a total brew time of about 3 minutes. If it finishes too fast (say, under 2:30), grind finer next time. If it’s too slow (over 4:00), grind coarser.

That’s it. You’ll taste a cup that’s bright, sweet, and full-bodied—not weak or sour. If you’d used 1:16, you’d likely get a thinner, more delicate cup that might miss the mark on strength.

Quick tip: If your coffee tastes bitter, you’re likely over-extracting—try a slightly coarser grind or a shorter brew time. If it’s sour, under-extracting—make the grind finer or extend the brew.

The Bottom Line

Stop treating 1:16 as the only truth. The SCA’s own standard allows 50–60 g/L, which translates to roughly 1:16 to 1:18, but for most pour-over coffees, especially light roasts, we recommend 1:15. That’s the ratio that consistently hits the SCA’s strength and extraction targets in our shop. So next time you brew, try 1:15. Taste the difference. You might never go back.

Remember: the ratio is a starting point, not a rule. Adjust based on your beans, your grind, and your taste. The most important thing is to brew with intention and enjoy the cup.

Sources

• SCA - https://sca.coffee
• Roast Magazine - https://roastcc.com/learn/coffee-roast-levels
• 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
• Roast Coffee Co. specialty - https://www.roastcc.com/learn/what-is-specialty-coffee