Pour Over Coffee Ratio Guide: Brew Better Cups

A dependable pour over coffee ratio is 1:16, meaning 1 g of ground coffee for every 16 ml of water. This produces a balanced cup with enough sweetness, clarity and body for most light-to-medium roasted specialty coffees. For a single mug, use 15 g coffee and 240 ml water. For two smaller cups, use 30 g coffee and 480 ml water. Weigh both ingredients rather than relying on spoons or cup markings.

The ratio determines brew strength, but it does not solve every brewing problem. A cup can be weak because there is too much water, but it can also taste thin because the grind is too coarse or the brew ran too quickly. Likewise, a very strong cup may come from a tight ratio, yet bitterness or dryness usually points to an over-fine grind, overly hot water or excessively long contact time.

Treat 1:16 as a starting recipe rather than a fixed rule. Coffee origin, roast development, brewer shape and personal preference all matter. Washed coffees with bright acidity often suit 1:16 to 1:17, while a fuller-bodied natural coffee may feel more satisfying at 1:15. Change one variable at a time so you can understand what improved the cup.

Calculating a coffee ratio is simple: multiply the coffee dose by the second number in the ratio. For a 1:16 recipe, 18 g of coffee needs 288 ml of water because 18 multiplied by 16 equals 288. In practical brewing, 1 ml of water weighs approximately 1 g, so your scale can measure water in grams without any conversion. This makes recipes accurate and repeatable.

If you know how much coffee you want to brew, calculate water from the ratio. If you know your preferred drink size, divide the water by the ratio to find the coffee dose. For example, 300 ml divided by 16 equals 18.75 g. Round to 19 g for a practical recipe. A small rounding difference is rarely important, provided your other measurements stay consistent.

Do not confuse the water poured with the final drink in the cup. Ground coffee retains water after brewing, usually around twice its dry weight. A 15 g dose brewed with 240 ml water may yield roughly 210 ml of coffee. Plan for this retention when brewing for guests or filling a particular cup size.

For a reliable single serving, use 15 g freshly roasted coffee, 240 g water and a 1:16 ratio. This recipe works well in a V60 01 or 02, a Kalita Wave 155 or a similar flat-bottom brewer. Grind medium-fine, resembling fine sand but not powder. Use filtered water heated to 94°C for light-to-medium roasts, or 91–93°C for more developed medium roasts.

Rinse the paper filter thoroughly with hot water before brewing. This removes papery flavour, warms the brewer and preheats the serving vessel. Discard the rinse water, add the ground coffee and gently level the bed. Start the timer as soon as the first bloom water touches the coffee, not after the bloom has finished.

The aim is an even, controlled extraction rather than a dramatic pouring performance. Pouring too hard can create channels through the coffee bed and draw down unevenly. Keep the kettle stream narrow, pour mostly over the coffee rather than directly against the filter wall, and use a gentle swirl only when it helps flatten a visibly uneven bed.

Choose 1:15 when you want greater concentration, more body and a shorter drink. It is useful if you enjoy coffee with milk, prefer a punchier flavour or are brewing a coffee that tastes muted at a wider ratio. With 15 g coffee, a 1:15 recipe uses 225 ml water. Because there is less water, the cup will be stronger, but it may also reveal bitterness if the coffee is over-extracted.

Choose 1:16 as your baseline when learning a new coffee. It is versatile, easy to calculate and usually gives sufficient strength without making delicate flavours disappear. This ratio works especially well for a clean washed coffee where you want sweetness and acidity in balance. It also provides a useful reference point for evaluating whether later changes are helping.

Choose 1:17 when a coffee tastes intense, heavy or slightly dry at 1:16, but its extraction otherwise seems sound. More water lowers the beverage concentration and can make floral, tea-like or citrus notes more apparent. Do not automatically move to 1:17 to fix sourness, however. Sour, salty or sharply underdeveloped flavours generally need a finer grind, more even pouring or a modestly higher water temperature instead.

The ratio sets the amount of coffee and water, while grind size controls how quickly water travels through the coffee and how much flavour it extracts. A medium-fine grind is the most useful starting point for pour over. If your brew finishes before 2:15 with a 15 g, 240 g recipe, grind finer. If it continues past 3:30 and tastes harsh or drying, grind coarser.

Taste should guide the adjustment more than time alone. A fast brew can still taste good if the coffee is unusually soluble, while a slower brew can taste sweet in a flat-bottom brewer. Still, timing gives you a helpful diagnostic. Record dose, water, temperature, grinder setting, total time and tasting notes. After two or three brews, patterns become much clearer than relying on memory.

Change only one setting at a time. If you alter the ratio, grind, temperature and pouring pattern together, you will not know which change produced the result. For most dialling-in, leave the 1:16 ratio in place first and adjust the grind. Once the flavour is balanced, decide whether you would personally enjoy the drink stronger or lighter.

Use water between 92°C and 96°C for most pour over coffee. Lighter roasts generally benefit from 94–96°C because they are harder to extract and often contain more dense, intact flavour compounds. Medium roasts often perform well around 92–94°C. For darker roasts, begin at 90–92°C to reduce harsh roast bitterness. A temperature-controlled kettle is helpful, but a simple thermometer is enough for consistent practice.

Blooming means adding a small amount of water first and allowing the coffee to release trapped gas. Use roughly two to three times the coffee weight in water. For 15 g coffee, use 30–45 g water. Let it sit for 30–45 seconds. Fresh coffee often expands noticeably during this stage, while older coffee may show less movement. Both can still brew well, but very stale coffee will rarely produce the same aroma or sweetness.

The bloom is not a ceremony; it is preparation for even saturation. Ensure every dry particle is wet by pouring steadily from the centre outward, then give the brewer a small swirl if dry pockets remain. Avoid aggressive stirring, which can create excessive fines migration and slow the drawdown, especially in conical brewers with fine paper filters.

Brewer design affects body, clarity and flow, so the same coffee can feel different at the same ratio. A V60-style cone encourages a deeper coffee bed and can produce high clarity when pouring is controlled. Start at 1:16, using a medium-fine grind and a 2:30–3:15 minute total brew time for a 15 g dose. The large opening makes pouring technique and filter placement particularly important.

A flat-bottom brewer such as a Kalita Wave often produces a rounder, more even cup because water exits through several small holes. Start at 1:15.5 to 1:16.5. Flat-bottom brewers can be more forgiving of minor pouring variations, but they can stall if too many fines collect at the filter base. Use a slightly coarser grind if drawdown becomes unusually slow.

Immersion-drip brewers, including the Clever Dripper and Hario Switch, allow longer contact before drainage. A 1:15 to 1:16 ratio is a good starting range, but grind slightly coarser than a conventional V60. For a French-press-style immersion phase, steep for about 2 minutes before releasing the valve, then allow 45–90 seconds to drain. At Capra Café, we teach the recipe as a framework: brewer-specific adjustments should follow the taste in the cup.

A weak cup is not always under-extracted. First ask whether it lacks strength or lacks flavour. If it tastes watery but pleasant, use less water by moving from 1:16 to 1:15, such as 15 g coffee to 225 ml water. If it tastes watery, sour and brief, keep the ratio at 1:16 but grind finer to increase extraction. These are different problems and require different solutions.

Sourness often signals insufficient extraction, particularly when it resembles lemon peel, green apple or salty water and disappears quickly. Grind finer, raise the water temperature by 1–2°C, extend the bloom slightly or pour more evenly. If your coffee is a very light roast, it may need a combination of finer grinding and hotter water. Make small changes rather than jumping several grinder settings at once.

Bitterness, astringency and dryness are common signs of excessive extraction or uneven flow. Grind coarser first. If the coffee bed is muddy, reduce stirring and forceful swirling. If you are using 96°C water for a medium or darker roast, lower it by 2–3°C. A hollow cup, where flavour seems present but disconnected, can also come from channeling; improve saturation during the bloom and keep pours calm and centred.

Consistency comes from measuring, not from memorising a pouring routine. Use a scale that reads to 0.1 g if possible, a timer and a kettle with a controlled stream. Weigh the dry coffee, tare the scale after adding the brewer and stop at the intended water weight. Keep a simple brew note on your phone: coffee name, roast date, dose, ratio, temperature, grind setting, total time and whether the cup tasted sweet, sour, bitter or thin.

Use coffee within a sensible freshness window. Most specialty coffee brews well from around 7 days after roasting and remains enjoyable for several weeks when stored airtight, cool and away from direct light. Very fresh coffee can release large amounts of gas and brew unevenly, while old coffee often tastes papery or muted. Grind immediately before brewing because ground coffee loses aroma quickly.

Water deserves as much attention as the coffee. Water that is heavily chlorinated, extremely hard or very soft can flatten flavour or create harshness. Use clean filtered water if your tap water has a noticeable taste. Once your ingredients are stable, avoid changing your pour pattern every morning. A repeatable recipe gives you the confidence to make one deliberate adjustment when the coffee changes.