Coffee Brewing Ratios: The Secret to a Perfect Cup

If you have ever brewed a cup of coffee that tasted like a revelation on Monday, only to have it taste like dishwater on Tuesday, you are likely suffering from a ratio crisis. At Scorgo Coffee and Roastery, we spend countless hours perfecting our roast profiles, but that hard work can be undone in seconds if the coffee brewing ratio is not quite right. Understanding the relationship between coffee and water is the single most important step in moving from a casual drinker to a home barista.

In this post, we will strip away the jargon and explain exactly how much coffee you should be using, why precision beats eye-balling every time, and how you can tailor your brew to suit your personal palate.

The Problem with Scoops and Spoons

We have all been there. You reach for the trusty plastic scoop in the morning, toss two rounded spoonfuls into the French press, and hope for the best. The issue is that coffee beans are natural products with varying densities. A dark roast is physically larger but lighter in weight than a dense, light-roasted bean from Ethiopia. Using volumetric measurements like scoops or tablespoons can lead to fluctuations of over 10% in the actual weight of coffee used. This is why we always advocate for using a digital scale.

Why We Use Grams Per Litre

You might see ratios written as 1:15 or 1:17. I find that using a grams per litre (g/L) standard is much more intuitive for the UK home brewer. If you know your mug holds 250ml, and the recipe calls for 60g per litre, the maths is simple: you need a quarter of that, which is 15g.

Finding Your Personal Golden Ratio

There is no single correct ratio in coffee, only preference. At the roastery, we generally recommend 60 grams of coffee per 1 litre of water as a universal baseline. This typically results in a balanced cup with a pleasant mouthfeel and clear flavour definition.

If your brew tastes a little weak or thin but the flavour is good, increase your ratio to 65g or 70g per litre. But if the coffee tastes sour or overly bitter, the problem is probably extraction rather than ratio. Adjust your grind size or water temperature before changing the weight.

Method Matters: Percolation vs. Infusion

• Percolation (e.g., V60, Chemex, Auto-Drip): Water passes through a bed of coffee. A ratio of 60g/L is usually spot-on here.
• Infusion (e.g., French Press, AeroPress, Clever Dripper): All the coffee and water sit together for the duration of the brew. We recommend bumping your ratio up to 70g or even 75g per litre for these methods.

A Quick Guide to Starting Ratios

1. Pour Over / Drip: 60g per 1000ml (30g for a 500ml brew).
2. French Press: 70g per 1000ml (35g for a 500ml brew).
3. AeroPress: Start at 15g of Scorgo coffee per 200ml and adjust based on how much you dilute the final cup.

The Importance of Water Weight

If you are weighing your coffee but still filling to the line with water, you are only halfway to consistency. Place your entire brewing setup on the scale, tare it to zero, and weigh the water as you pour. In the world of coffee, 1ml of water equals 1g of weight.

Final Thoughts: Experimentation is Key

While we provide these numbers as a guide, do not take them as gospel. You might find that our lighter roasts sing at 55g/L, while a darker profile needs the structure of 65g/L. The scale exists to give you a map so that when you find that perfect cup, you know exactly how to get back there again tomorrow.

At Scorgo Coffee and Roastery, we are passionate about helping the UK coffee community brew better. Happy brewing!