The ratio 1:x is grams of water per gram of coffee. It is the fastest way to scale a recipe without re-thinking it.
Common ranges
Filter: 1:15–1:17. Immersion: 1:12–1:15. Cold brew: 1:6–1:10. Espresso is different and uses yield, not water added.
Use the calculator
Enter what you know and the calculator returns the rest by weight. The Brew Log keeps your favorite ratios.
