# AeroPress Coffee-to-Water Ratio Canonical: https://brew.supply/learn/aeropress-coffee-to-water-ratio Description: A practical AeroPress coffee-to-water ratio guide: where the useful baseline lives, when to shift stronger or weaker, and why ratio alone does not decide the cup. An AeroPress coffee-to-water ratio between roughly 1:14 and 1:17 is a practical baseline for filter-style cups: about 14–17 g of water for every 1 g of coffee, with the cup that drinks closest to a pour-over usually sitting in the 1:15 to 1:16 range. Ratio sets strength expectations, but grind, water temperature, brew time, agitation, and the press itself decide most of what the cup actually tastes like. ## What the ratio actually means A coffee-to-water ratio is simply how many grams of brew water you use per gram of dry coffee. A 1:15 ratio means 1 g of coffee to 15 g of water, so a 15 g dose meets 225 g of brew water. AeroPress recipes usually express this against brew water that touches the grounds, not against the cup that lands in front of you after pressing or bypass. That distinction matters because the AeroPress press phase, the filter, and any added bypass water all change the served beverage mass. The recipe ratio describes the extraction setup; the cup you drink is the result of that setup plus what happens after the brew. ## A practical baseline for filter-style AeroPress cups For an everyday filter-style cup, most reliable AeroPress recipes land somewhere between 1:14 and 1:17. That range is wide enough to fit different roast levels, different grinders, and different taste preferences without forcing anyone into a single number. A common starting point is around 15 g of coffee to 225 g of water (1:15) or 14 g to 220 g (close to 1:15.7), which is also close to the official AeroPress single-cup recipe range. From there the brewer can pull stronger or weaker by adjusting dose, water, or both — but the more useful next move is usually grind, not ratio. - Light to medium roasts often drink cleaner near 1:15 to 1:16. - Darker roasts can taste better slightly weaker, around 1:16 to 1:17, to keep bitterness in check. - Larger cups built for travel mugs commonly scale the same ratio up rather than changing it. ## When stronger or weaker actually helps Moving the ratio is most useful when the cup feels structurally too thin or too heavy across many brews, not when a single brew tastes a bit off. A 1:12 ratio (for example 18 g to 216 g) pushes the cup denser and is closer to a strong filter or concentrated brew. A 1:17 to 1:18 ratio produces a lighter, tea-like cup that some brewers prefer with delicate light roasts. If the cup is only sometimes off, ratio is usually not the variable to chase. Grind size, water temperature, and how repeatable the press phase is tend to explain more of the brew-to-brew difference than a half-point ratio change. - Cup feels weak and watery across multiple brews → consider 1 ratio step stronger. - Cup feels heavy, syrupy, or astringent across multiple brews → consider 1 ratio step weaker, then revisit grind. - Cup is inconsistent between brews → fix repeatability first, then revisit ratio. ## Ratio is not the whole brew Two AeroPress brews at the same 1:15 ratio can taste very different if the grind, water temperature, agitation, steep time, or press behaviour change. Ratio sets the broad strength target, but the extraction quality — how cleanly the coffee gives up its solubles — comes from the rest of the recipe. This is why Brew Supply treats ratio as one input among several rather than the headline number. The cup is shaped by what enters the brew (dose, water, grind), what happens during the brew (steep, agitation, temperature), and what happens to end the brew (press speed, endpoint, any bypass). ## Bypass and served cup ratios Many AeroPress recipes brew at a tighter ratio such as 1:10 or 1:12 and then add bypass water in the cup. The brew water touching the grounds is the extraction ratio; the final cup, once bypass water is added, sits at a more dilute drinking ratio. If you want to compare recipes honestly, separate those two numbers. A recipe that uses 18 g of coffee, 180 g of brew water (1:10), and 75 g of bypass produces a final beverage closer to 1:14 in the cup, but its extraction behaviour is still anchored to the 1:10 brew step. Concentrate-and-bypass logic deserves its own page; on this guide, ratio refers to brew water unless noted. ## Why a written ratio can still drift A written ratio is only as repeatable as the workflow around it. If the dose is weighed but the brew water is poured by sight, or if the press phase varies a lot from brew to brew, the cup that lands on the table will not match the ratio you wrote down. In practice, the brewers who get the most out of small ratio changes are usually the ones who have already stabilized the steps around the ratio. That is where the rest of Brew Supply’s tools and language live: making the press, endpoint, and preparation steps repeatable enough that ratio decisions are actually testable. ## A pragmatic decision order - Pick one starting ratio in the 1:14 to 1:16 range and brew it twice the same way. - If both cups feel structurally off in the same direction, move the ratio by one step. - If the two cups disagree with each other, fix repeatability before changing the ratio. - Treat grind, water temperature, and steep time as the next levers once the ratio feels broadly right. ## FAQ ### What is the best AeroPress coffee-to-water ratio? There is no single best ratio. A practical baseline for filter-style AeroPress cups sits between 1:14 and 1:17, with 1:15 to 1:16 being a common starting point. Stronger ratios such as 1:10 to 1:12 are used for concentrate-style brews that then meet bypass water in the cup. ### How much coffee for one AeroPress cup? A common single-cup setup uses about 14 to 17 g of coffee with roughly 220 to 250 g of brew water, which lands inside the 1:14 to 1:17 baseline range. The exact dose depends on the cup size you want and how strong you like the result. ### Is 1:15 stronger or weaker than 1:17? 1:15 is stronger. A smaller second number means less water per gram of coffee, which produces a denser cup. 1:17 uses more water per gram of coffee and drinks lighter. ### Should I change the ratio or the grind first? If the cup feels structurally too strong or too weak across multiple brews, change the ratio. If the cup feels bitter, sour, or astringent but its strength is roughly right, change the grind first. Ratio sets strength; grind, water, and time set extraction quality. ## Related Guides - [Why AeroPress brews stop matching](/learn/aeropress-repeatability): A practical explanation of hidden variability in AeroPress brewing and how to reduce it. - [AeroPress precision tools guide](/aeropress-precision-tools): How Brew Supply frames variables, workflow control, and repeatable AeroPress brewing. - [AeroPress championship prep framework](/learn/aeropress-championship-prep): A practical training structure for competition brews, logging, workflow, and serving. ## Related Tools - [AeroBox precision press stand](/tools/aerobox): AeroBox turns grams-out and press speed into measurable recipe variables. - [3D-printable AeroPress press stop](/tools/press-stop): AeroStop makes the press endpoint physical and repeatable. - [Bean Sieve matched-dose workflow](/tools/bean-sieve): BeanSieve makes whole-bean size composition visible before grinding.