Brew Recipe Calculator
Craft the perfect cup by calculating the ideal coffee-to-water ratio for any brew method.
The dry weight of your coffee grounds in grams.
The ratio of water to coffee. E.g., for a 1:16 ratio, enter 16.
320 ml
40 ml
140 ml
140 ml
Coffee vs. Water Proportions
Coffee
Water
Example Pouring Schedule
| Stage | Pour Amount (ml) | Total Water Added (ml) | Suggested Timing |
|---|---|---|---|
| Bloom | 40 | 40 | 0:00 – 0:45 |
| First Pour | 140 | 180 | 0:45 – 1:30 |
| Second Pour | 140 | 320 | 1:30 – 2:30 |
What is a Brew Recipe Calculator?
A brew recipe calculator is an essential tool for coffee enthusiasts, from beginners to professional baristas, designed to ensure consistency and precision in coffee brewing. Its primary function is to calculate the precise amount of water needed based on a specified dose of coffee and a desired coffee-to-water ratio. Achieving the right ratio is fundamental to extracting the desirable flavors from coffee grounds, avoiding both under-extraction (sour, weak coffee) and over-extraction (bitter, harsh coffee). This calculator removes the guesswork, allowing you to replicate that “perfect cup” every single time.
Anyone who brews coffee using methods like pour-over (V60, Kalita Wave), French press, AeroPress, or even batch brewers can benefit from a brew recipe calculator. It helps translate a recipe you find online (e.g., “use a 1:16 ratio”) into actionable numbers for your specific brew size.
Brew Recipe Formula and Explanation
The core of any brew recipe is the ratio between the weight of dry coffee grounds and the weight of water used. Since 1 milliliter of water weighs 1 gram, we can use grams for both coffee and water to simplify the math. The formula is straightforward:
Total Water (g) = Coffee Dose (g) × Ratio Number
For example, if you use 20 grams of coffee and want a 1:16 ratio, you multiply 20 by 16 to get 320 grams (or 320 ml) of water. Our brew recipe calculator does this instantly and also breaks it down into a practical pouring schedule. You can learn more about how this impacts taste in our guide to understanding extraction.
Variables Table
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Coffee Dose | The mass of dry, ground coffee. | grams (g) | 15 – 30 g (for single cup) |
| Brew Ratio | The proportion of water to coffee (e.g., 16 in a 1:16 ratio). | Unitless ratio | 14 – 18 |
| Total Water | The total mass of water to be poured over the coffee. | milliliters (ml) / grams (g) | 210 – 540 ml |
Practical Examples
Let’s see how the brew recipe calculator works in real-world scenarios.
Example 1: Standard Single Cup (Hario V60)
- Inputs:
- Coffee Dose: 22 g
- Brew Ratio: 1:15
- Results:
- Total Water: 22 g * 15 = 330 ml
- Bloom Water: 22 g * 2 = 44 ml
- Main Pours: (330 – 44) / 2 = 143 ml each
Example 2: Larger Batch (Chemex)
- Inputs:
- Coffee Dose: 40 g
- Brew Ratio: 1:17 (often used for larger, cleaner brews)
- Results:
- Total Water: 40 g * 17 = 680 ml
- Bloom Water: 40 g * 2 = 80 ml
- Main Pours: (680 – 80) / 2 = 300 ml each
Adjusting these variables can drastically change your final cup. For more detail, check out our V60 vs Chemex guide.
How to Use This Brew Recipe Calculator
- Enter Coffee Dose: Weigh your dry coffee beans and enter the value in the “Coffee Dose (g)” field. A typical starting point for a single cup is 20-25 grams.
- Set Brew Ratio: Input your desired ratio in the “Brew Ratio (1:X)” field. A 1:16 ratio is a great all-around starting point. A lower number (e.g., 14) will result in a stronger, more concentrated brew, while a higher number (e.g., 18) will be lighter and more delicate.
- Review Results: The calculator instantly provides the “Total Water Needed”. It also suggests a pouring schedule, including the “Bloom Water” (typically 2-3x the coffee dose) and subsequent pours.
- Interpret the Chart and Table: Use the visual chart to understand the proportion of coffee to water. The table provides a clear, step-by-step pouring guide with target volumes and suggested timings to help you execute the brew perfectly.
Key Factors That Affect Your Brew Recipe
While our brew recipe calculator gives you the numbers, several other factors influence the final taste. Mastering them is key to perfecting your coffee.
- Grind Size: This is arguably the most important factor besides your brew ratio. A finer grind increases surface area, leading to faster extraction. A coarser grind requires more time or agitation. See our coffee grind size chart for guidance.
- Water Temperature: The ideal range is 92-96°C (198-205°F). Hotter water extracts more quickly, while cooler water extracts more slowly. Never use boiling water, as it will scorch the coffee.
- Brew Time: The total duration your coffee and water are in contact. This is directly related to grind size. A typical pour-over might take 2:30 to 4:00 minutes.
- Agitation: How much you stir or swirl the coffee slurry. More agitation increases the extraction rate and can help ensure all grounds are evenly saturated.
- Coffee Beans: The origin, processing method, and roast level of your beans determine the inherent flavor profile. A light roast might need a slightly higher ratio or temperature to extract its delicate notes.
- Water Quality: Since coffee is over 98% water, the mineral content of your water significantly impacts flavor. Using filtered or specific brew water is recommended over hard tap water. Our post on water for coffee explains this in depth.
Frequently Asked Questions (FAQ)
1. What is the best brew ratio?
There is no single “best” ratio, but a great starting point for most methods is 1:16 (1 gram of coffee to 16 grams of water). From there, you can adjust to your taste. Try 1:15 for a stronger cup or 1:17 for a lighter one.
2. Does this calculator work for French press?
Yes! The brew recipe calculator is perfect for immersion methods like French press. A common French press ratio is slightly lower, around 1:14 or 1:15, due to the full immersion style. Simply enter your desired dose and ratio to get the total water volume.
3. Why is the bloom important?
The bloom is the initial pour of water that wets the coffee grounds. It allows trapped CO2 gas (a byproduct of roasting) to escape. Releasing this gas prevents it from repelling water during the main pours, leading to a much more even and efficient extraction.
4. Can I use ounces instead of grams?
While this calculator is optimized for grams (the standard for specialty coffee due to its precision), you can convert. 1 ounce is approximately 28.35 grams. For best results, we highly recommend using a digital scale that measures in grams.
5. How does roast level affect my recipe?
Lighter roasts are denser and less soluble, so they often benefit from a slightly finer grind, higher water temperature, or a longer ratio (e.g., 1:17). Darker roasts are more soluble and can become bitter easily, so they often work well with a coarser grind or a shorter ratio (e.g., 1:15).
6. What happens if my brew is too fast or too slow?
If your total brew time is too fast, your coffee will likely be sour and under-extracted; you should use a finer grind. If it’s too slow, it will likely be bitter and over-extracted; you should use a coarser grind. The pour over troubleshooting guide has more tips.
7. Does the pouring schedule matter?
Yes, how you add the water matters. The goal is to keep the coffee grounds evenly saturated without letting the bed dry out or flood. The multi-pour schedule suggested by the brew recipe calculator helps maintain a stable temperature and even extraction throughout the process.
8. How do I interpret the result if my coffee tastes bad?
If your coffee tastes bad despite a perfect ratio, isolate other variables. The most likely culprit is incorrect grind size. After that, check your water temperature. Finally, consider the freshness and quality of your coffee beans.