Coffee Brewing Timers

The ratio is crucial because it determines the strength (Total Dissolved Solids) and the extraction level of your brew. Too much water (a high ratio like 1:20) can over-extract the grounds, leading to bitter, hollow flavors. Too little water (a low ratio like 1:12) can under-extract, resulting in a sour, salty, or overly concentrated taste. By controlling the ratio, you manage the balance between the solubles pulled from the beans and the water that carries them, directly impacting the body and flavor profile.

Grind size and ratio are deeply interconnected. Finer grinds have more surface area, which speeds up extraction, often allowing for shorter ratios (like espresso). Coarser grinds have less surface area and extract more slowly, necessitating longer contact times or different ratios to achieve balance. If you change your ratio to be 'longer' (more water), you may need to coarsen your grind to prevent over-extraction. Conversely, if you use a 'shorter' ratio, a finer grind helps ensure you still extract enough flavor in the limited water volume.

Yes, the 'bloom' water (the initial small pour used to degas the coffee) must always be included in the total water weight for your ratio. For example, if your recipe calls for 300g of water for 20g of coffee (1:15), and you use 40g of water for the bloom, you have 260g of water remaining for the rest of your pours. Failing to include the bloom water would result in a 'longer' ratio than intended (1:17 in this case), leading to a weaker and potentially over-extracted cup of coffee.

To scale a coffee recipe, maintain the same coffee-to-water ratio but increase the total weights proportionally. If your single-cup recipe is 20g coffee to 320g water (1:16) and you want to make three cups, multiply both numbers by three: 60g coffee to 960g water. Note that when scaling up pour-over methods, the larger bed of coffee will slow down the water flow, so you may need to use a slightly coarser grind to keep the total brew time within an acceptable range and avoid over-extraction.