Brew Single-Origin Coffee at Home: the 1:18 Ratio

Brew single-origin coffee exactly the way you brew any other coffee — 55 g of coffee per litre of water, about 1:18 by weight — and then change one thing at a time. There is no special single-origin method. What single origin gives you is a coffee consistent enough that when you adjust the grind or the dose, you can actually tell what the adjustment did; a blend is built to hide that. Weigh the coffee, weigh the water, grind on a burr grinder, and write down what you changed.

Correction: this page told you to use roughly twice as much coffee as the standard

An earlier version of this page said: “Use a coffee scale and aim for about 20 grams per cup for balanced flavor.” That is wrong by a wide margin and it needs stating plainly rather than quietly fixing.

A coffee “cup” is 6 fluid ounces, not 8 — this is the single most common source of dosing errors online, because kitchen “cups” and coffee “cups” are different units. Six fluid ounces is about 177 ml of water. Twenty grams of coffee in 177 ml is roughly 113 g per litre — about a 1:9 ratio, more than twice the standard dose, and stronger than the strongest published range for any common brewing method. Even reading “cup” generously as 8 fl oz it lands near 1:12, still far outside the reference.

The reference figure comes from the Specialty Coffee Association’s brewing standard for home brewers, which states it as a mass ratio: “The standard brew ratio of 55 g of coffee per 1.000 kg of 17±3°C water” (§7.1.5) (SCA Standard 310-2021, Home Coffee Brewers). Fifty-five grams in a kilogram of water is 1:18.2. The National Coffee Association’s consumer version of the same idea is “1 to 2 tablespoons of ground coffee for every 6 ounces of water (the ‘Golden Ratio’)” (NCA, drip coffee), whose strong end lands close to the SCA number.

And the direction of travel confuses almost everyone, so: stronger coffee means MORE coffee, not less. A 1:15 brew is stronger than a 1:18 brew. The second number is water, so as the drink gets stronger the number gets smaller. If your coffee tastes thin, add coffee — do not add water and hope.

Method-specific ratios are not contradictions

1:18 is the drip and general reference. Individual methods have their own published ranges, and using them is not disagreeing with the standard — it is what the standard expects. From the National Coffee Association’s own brewing guides:

MethodNCA coffee-to-water ratioGrindContact time
Drip (house reference)1–2 tbsp per 6 fl oz — about 1:18 by weightMedium, like kosher salt~5 minutes
Pour-over1:13 to 1:16Medium2–4 minutes
French press1:10 to 1:16Coarse, like rock salt~4 minutes
Espresso1:2 (dry coffee to liquid espresso)Fine, like table salt20–30 seconds

The NCA states the underlying rule as well: “As a general rule, the longer the coffee is in contact with water during the brewing process, the coarser the grind should be.” That is why espresso is fine and cold brew is coarse, and it is the one principle worth memorising if you memorise nothing else.

For water temperature, see our page on the best temperature for French press coffee, which gives the standard range and the source behind it. The old version of this page said “aim for around 200°F (93°C)”, which sits inside that range and was not wrong — it is simply covered properly elsewhere and does not need restating here.

What single origin actually means, and what it does not

Single origin means the coffee in the bag comes from one place — one country, one region, one cooperative, sometimes one farm or one lot. The label says nothing about quality: a single-origin coffee can be poor, and a blend can be excellent. What it says is that the variables have been narrowed, which is why it is the right thing to buy while you are learning to brew. Our page on house blend coffee covers the other side of that choice.

An earlier version of this page carried a table assigning fixed flavours to four countries — Ethiopia “fruity, floral”, Colombia “nutty, caramel”, Brazil “nutty, chocolate”, Kenya “berry, winey”, each with an acidity rating. Nobody at this site cupped any of them, no source was given, and country-level tasting notes are not reliable in any case: processing method and roast level move the cup more than the border does. The table has been removed rather than re-sourced. Where regional character can be attributed to someone who is entitled to describe it, we do that on the origin pages themselves — see Ethiopian coffee beans, history and regions, which quotes Ethiopia’s own coffee-quality authority rather than inventing notes.

Two things on the bag matter more than the origin name: the roast date and the process (washed, natural, honey). If you want to know what the roast level is doing to your cup, see coffee roast levels.

The one piece of equipment that changes the result

Grind consistency, not the brewer. The National Coffee Association is unambiguous about which type to buy: “We recommend using a burr grinder—whether at home or where you buy your coffee beans.” Its reasoning is mechanical rather than aesthetic — a burr grinder “crushes coffee beans between a moving grinding wheel and a non-moving surface”, and these “do a better job of creating a consistent grind, which allows the flavors of the coffee to extract more evenly… They’re also less likely to overheat the grounds during the grinding process.”

That consistency is measurable. A study in Scientific Reports that ground coffees under controlled conditions found the particle size distribution “is independent of the bean origin and processing method”, but that bean temperature is not neutral — “grinding cold results in a narrower particle size distribution, and reduced mean particle size” (Uman et al., Scientific Reports 6: 24483, 2016). The practical reading: your grinder and your beans’ temperature control the grind; the origin on the bag does not.

A scale matters for the same reason. Volume measures of ground coffee vary with grind size and roast level — a tablespoon of dark-roast coarse grounds and a tablespoon of light-roast fine grounds are not the same mass — which is exactly how a page ends up recommending twice the dose it meant to.

The mistakes that are actually worth fixing

  • Guessing the dose. Covered above. It is the most common error and the largest in effect.
  • Changing two things at once. If you alter the grind and the ratio in the same brew, you have learned nothing. This is the whole reason to buy single origin while you are dialling in.
  • Blaming extraction for a stale bag. Grind size and time are worth adjusting only once the coffee is fresh; before that you are tuning a variable you do not control.
  • Dirty equipment. Coffee oils go rancid, and a grinder holds them. Rinse the brewer after each use and clean the grinder periodically. If your beans leave visible oil on everything, why some coffee beans are oily explains what that is and is not telling you.

Bitter usually means over-extracted: grind coarser or shorten the contact time. Sour or thin usually means under-extracted: grind finer, or add coffee. Those two sentences replace several paragraphs of the old page that said the same thing at greater length.

Equipment links, and a disclosure that belongs next to them

These are paid links. If you buy through one, this site earns a commission and you pay the same price. As an Amazon Associate I earn from qualifying purchases. Nothing listed here has been bought, used or tested by us — these are the specific products the old version of this page pointed at, corrected and named accurately, not a tested recommendation. The Federal Trade Commission’s rule is that “in any communication using an interactive electronic medium, such as social media or the internet, the disclosure should be unavoidable” (16 CFR § 255.0(f)), which is why it is here rather than at the bottom of the page.

Three corrections were made to those links, and they were not cosmetic. The coffee link on the old page paid commission to an affiliate account belonging to a different website entirely, so this site earned nothing from it. The pour-over link pointed at an Amazon search results page rather than a product. And a link whose anchor text read “Baratza Encore” actually pointed at the Baratza Sette 270 — a different and considerably more expensive grinder. It is named correctly above.

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