Coffee to Water Ratio Calculator (French Press, Pour Over, Espresso)
Brew ratio is the single biggest lever on how coffee tastes, ahead of grind size, water temperature and bean origin. The specialty industry's golden ratio sits between 1:15 and 1:17 by weight for filter methods, which produces an extraction yield near twenty percent and a total dissolved solids reading in the 1.15-1.35 percent band most tasters prefer.
Bloom with 63 g of water — twice the coffee weight — for thirty to forty-five seconds before the main pour.
| Method | Ratio | Coffee needed | Grind | Brew time |
|---|---|---|---|---|
| Espresso | 1:2 | 250.0 g | Fine | 25-30 s |
| Cold brew concentrate | 1:5 | 100.0 g | Extra coarse | 16-20 h |
| Moka pot | 1:8 | 62.5 g | Fine-medium | 4-5 min |
| AeroPress | 1:14 | 35.7 g | Medium-fine | 1:30-2:00 |
| French press | 1:15 | 33.3 g | Coarse | 4:00 |
| V60 pour over | 1:16 | 31.3 g | Medium-fine | 2:45-3:15 |
| Chemex | 1:17 | 29.4 g | Medium-coarse | 4:00-4:30 |
Weigh, do not scoop
A tablespoon of whole beans and a tablespoon of ground coffee differ by nearly forty percent in mass, and roast level changes bean density substantially — dark roasts are lighter for the same volume. A cheap kitchen scale reading to 0.1 grams removes more inconsistency than any equipment upgrade.
Why the bloom matters
Fresh coffee releases carbon dioxide during the first minute of contact with hot water. That gas physically repels water from the grounds and causes uneven extraction. Wetting with roughly twice the coffee weight and waiting thirty to forty-five seconds lets it degas so the main pour extracts evenly.
Diagnosing sour versus bitter
Sour, thin coffee means under-extraction: grind finer, brew longer, or raise water temperature. Harsh, drying bitterness means over-extraction: grind coarser or shorten contact time. Adjust one variable at a time, and change the ratio only once grind and time are dialled in.
Brew ratios and target parameters
| Method | Ratio | Grind | Water temp | Total time | Typical TDS |
|---|---|---|---|---|---|
| Espresso | 1:2 | Fine | 92-94°C | 25-30 s | 8-12% |
| Moka pot | 1:8 | Fine-medium | Stovetop | 4-5 min | 3-5% |
| AeroPress | 1:14 | Medium-fine | 80-90°C | 1:30-2:00 | 1.4-1.8% |
| French press | 1:15 | Coarse | 93-96°C | 4 min | 1.2-1.5% |
| V60 | 1:16 | Medium-fine | 92-96°C | 2:45-3:15 | 1.2-1.4% |
| Chemex | 1:17 | Medium-coarse | 93-96°C | 4:00-4:30 | 1.1-1.3% |
| Cold brew | 1:5 concentrate | Extra coarse | Room temp | 16-20 h | 3-4% |
People also ask
How many grams of coffee for 500 ml of water?
About 31 g at the 1:16 pour-over ratio, 33 g for French press at 1:15, or 29 g for Chemex at 1:17.
What is the golden ratio for coffee?
Between 1:15 and 1:17 coffee to water by weight for filter brewing. Espresso runs far more concentrated at roughly 1:2.
Should I measure coffee by volume or weight?
Always by weight. Bean density varies by roast level and origin, so a scoop can differ by thirty to forty percent in actual mass.
Three worked examples
Same engine, three different starting points — useful if you want to see how sensitive the answer is before you type your own numbers in.
Example 1: known amount 390 g / ml, brew method "Pour over V60"
On the lower / more conservative end. Bloom with 49 g of water — twice the coffee weight — for thirty to forty-five seconds before the main pour.
Example 2: known amount 500 g / ml, brew method "Pour over V60"
A typical middle-of-the-road setup. Bloom with 63 g of water — twice the coffee weight — for thirty to forty-five seconds before the main pour.
Example 3: known amount 650 g / ml, brew method "Chemex"
On the higher / more demanding end. Bloom with 76 g of water — twice the coffee weight — for thirty to forty-five seconds before the main pour.
Quick answers about the Coffee Brew Ratio Tool
What exactly does the Coffee Brew Ratio Tool work out?
Brew ratio is the single biggest lever on how coffee tastes, ahead of grind size, water temperature and bean origin. You enter brew method, i know my, known amount and strength adjustment and the result panel updates straight away, so you can compare two or three versions of the same question in a few seconds.
What do I need before I start?
Only 4 fields: brew method, i know my, known amount and strength adjustment. Nothing else is needed and nothing is stored.
How is it calculated — weigh, do not scoop?
A tablespoon of whole beans and a tablespoon of ground coffee differ by nearly forty percent in mass, and roast level changes bean density substantially — dark roasts are lighter for the same volume. The same maths runs inside this page, so hand-checking the result on paper gives you the identical figure.
Why do two calculators give me different answers for coffee Brew Ratio Tool?
Fresh coffee releases carbon dioxide during the first minute of contact with hot water. Different sites pick different assumptions, so always check which method a calculator states before you trust the gap between two numbers.
What does the "Brew ratios and target parameters" table on this page tell me?
It is the reference range this tool works against — 7 rows from "Espresso" (1:2) up to "Cold brew" (1:5 concentrate). Use it to sanity-check whether the number you just calculated sits where you expected it to.
Which brew method should I pick?
The dropdown offers 7 choices — Pour over V60, Chemex, French press, AeroPress, Espresso, Cold brew concentrate and Moka pot. Pick the one that matches your real situation rather than the one you would like to be true; brew method usually moves the final figure more than any other single input, so it is worth running it twice with the option above and below your guess.
Do I have to press a button or reload the page to see the result?
No. Coffee Brew Ratio Tool runs completely inside your browser, so the moment you change a value the cards recalculate — there is no submit step, no page reload and no waiting for a server round trip. That also means it keeps working on a weak or intermittent mobile connection.
Is it free, and do you keep what I type?
It is free with no sign-up, no app install and no usage limit. Nothing you enter into Coffee Brew Ratio Tool leaves your device — the calculation is JavaScript running locally, so there is no upload of your figures to DrHint or anyone else.
Can I use it on a phone?
Yes — the layout stacks to a single column on small screens and the number fields open the numeric keypad on both Android and iOS. Many people bookmark this page or add it to their home screen and re-open it whenever the question comes up.
Anything to be careful about with the result?
About 31 g at the 1:16 pour-over ratio, 33 g for French press at 1:15, or 29 g for Chemex at 1:17. Treat the output as a well-grounded estimate for planning, not as a professional, legal or medical decision on its own.
Next useful tool
See how much caffeine is still in your bloodstream at bedtime. Enter your drink, the time you had it and your metabolism speed to get an hour-by-hour decay curve.
Scale any recipe up or down by servings and convert cup measures to grams by ingredient, with pan-size adjustment and baking-time guidance.
Enter a target dough weight and percentages to get exact flour, water, salt, yeast and levain weights, with dough-per-loaf and batch scaling.
Calculate true dough hydration including the flour and water inside your starter, plus salt percentage, total dough weight and a hydration-to-crumb reference table.
Compare the cost of a journey by petrol, diesel or electric vehicle, split it between passengers, and see the per-mile and per-kilometre running cost.
Size a solar array and battery bank from your monthly consumption and peak sun hours, including system losses, days of autonomy and depth of discharge.