Coffee-to-Water Ratio Chart: Measurements for 1, 2, 4, and 8 Cups
A coffee-to-water ratio is a recipe stated by weight: grams of coffee compared with grams of water. Because 1 milliliter of water weighs about 1 gram for everyday brewing, the tables below use milliliters and grams interchangeably for water.
Serving definition: one cup in this guide means 250 mL of brew water, not a coffee-maker “cup.” The water is an input measurement, so the beverage in your cup will weigh less after grounds retain some water.
Quick chart: 1, 2, 4, and 8 cups
Choose the strength that suits your coffee, then weigh both ingredients. The recipes below use 1:15, 1:16, and 1:18 as water-to-coffee ratios.
| Water / servings | 1:15, fuller | 1:16, balanced | 1:18, lighter |
|---|---|---|---|
| 250 mL / 1 cup | 16.7 g coffee | 15.6 g coffee | 13.9 g coffee |
| 500 mL / 2 cups | 33.3 g coffee | 31.3 g coffee | 27.8 g coffee |
| 1,000 mL / 4 cups | 66.7 g coffee | 62.5 g coffee | 55.6 g coffee |
| 2,000 mL / 8 cups | 133.3 g coffee | 125.0 g coffee | 111.1 g coffee |
Calculation: coffee dose = water weight ÷ ratio. For example, 500 mL ÷ 16 = 31.25 g; the chart rounds to 31.3 g. A scale that reads to 0.1 g is useful for the smallest recipes.
Where to start
The Specialty Coffee Association’s home-brewer requirements begin testing at 55 g of coffee per liter of water, approximately 1:18. This is a standardized test starting point, not a rule that every coffee or brewer must taste best at that ratio.
For a practical home recipe, begin at 1:16. If the brewed coffee tastes thin to you, keep water fixed and use the 1:15 dose next time. If it tastes too concentrated, try 1:18. Change one variable at a time so you know what improved the cup.
Recipes by brewing method
| Method | Starting recipe | Water temperature | Timing guidance |
|---|---|---|---|
| Pour-over | 20 g coffee : 320 mL water (1:16) | 93–96°C | Pour steadily; evaluate the brew rather than chasing a fixed time. |
| Automatic drip | 55 g coffee : 1,000 mL water (about 1:18) | Follow the brewer’s design | Use the brewer’s capacity and adjust grind only after the ratio is set. |
| French press | 30 g coffee : 480 mL water (1:16) | 93–96°C | Start around 4 minutes, then adjust grind and steep time to taste. |
| AeroPress-style immersion | 15 g coffee : 240 mL water (1:16) | Use a recipe suited to your method | Recipe variables vary widely; record your chosen time and agitation. |
These are starting recipes, not results from a controlled comparison. Grind, water, roast, and equipment affect extraction. The same ratio can taste different when one of those changes.
Use the ratio with a coffee-maker scale
Many coffee makers label a “cup” as 125 mL. If your machine uses that convention, four machine cups equal 500 mL, or two 250 mL servings in this guide. Read the brewer’s water markings, then use the calculation rather than assuming its cup number matches a mug.
For a faster calculation, use the Caffeine Brothers Coffee-to-Water Ratio Calculator. Enter your water amount and ratio, then round the dose only as much as your scale requires.
When the cup needs adjustment
- Too strong or too weak: change the coffee dose while keeping water constant.
- Sour, sharp, or underdeveloped: consider a finer grind, hotter water, or a longer contact time before changing ratio again.
- Bitter, dry, or astringent: consider a coarser grind, cooler water, or shorter contact time.
Those diagnosis notes are starting points, not a substitute for tasting. Adjust the ratio for beverage strength; adjust grind, temperature, and contact time for extraction.
Explore Caffeine Brothers for coffee beans, then write down the origin, roast date, ratio, dose, water, and result. A simple repeatable note makes it easier to reproduce a recipe you enjoy.
Sources checked September 17, 2026. Calculations use water-to-coffee ratios by mass. The SCA reference describes a standardized brewer-testing starting ratio; method recipes are practical starting points.
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