Free Online Calculators
Brew method + cups โ grams of coffee & water ml
This calculator tells you exactly how many grams of coffee and millilitres of water you need based on your brew method and number of cups. It applies standard brew ratios โ such as 1:15 for pour-over or 1:2 for espresso โ so every cup comes out consistently. No more guesswork, just perfectly measured coffee every time.
Most drip recipes land closer to the higher end, since one tablespoon per cup usually tastes thin and watery. Start with the stronger dose and reduce it if the brew comes out too intense for you.
Divide the weight of your water by the weight of your dry coffee โ the result is the second number in a ratio written as coffee to water. Weighing both on a kitchen scale is far more accurate than measuring by spoons or scoops.
Convert the water volume to grams (fluid ounces of water weigh roughly the same in millilitres terms) and divide by your chosen brew ratio to get the gram dose of grounds. Enter the water amount and the ratio above and the gram figure is calculated for you.
Take the water volume your coffee maker calls a "cup" โ usually smaller than a real measuring cup โ multiply it by four, then divide that water weight by your brew ratio. Because carafe cup sizes differ by brand, checking the marking on your machine matters more than any fixed spoon count.
Work it out from the gram dose rather than the scoop: weigh the grounds your ratio calls for, then see how many level scoops that fills. A standard coffee scoop holds about two tablespoons, but scoops vary, so weighing once tells you exactly how yours measures.
Fill the carafe to the twelve mark, note the water volume in millilitres, and divide that by your brew ratio to get the grams of grounds. A full pot needs a proportionally larger dose than a half pot, so scale the coffee with the water rather than guessing.
Convert your gram dose into volume: a quarter cup of medium-grind coffee weighs roughly the same each time, so weigh one quarter-cup scoop once and divide your target dose by that weight. Volume measuring is imprecise because grind size and how you pack the cup change the weight.
Less than you might expect, since dry grounds are light โ the dose for a full pot is a fraction of a measuring cup, not several cups. Calculate the grams from your water volume and ratio, then convert to volume if you have no scale.
Divide the gram dose for a full carafe by the weight your own scoop holds when levelled off. Since carafe "cups" and scoop sizes differ between brands, that one-time weighing gives a reliable number for your setup.
Getting the coffee-to-water ratio right is the single biggest factor separating a great cup from a mediocre one. Too little coffee and your brew tastes thin and sour. Too much and it turns bitter and harsh. This calculator takes the guesswork out of the equation, giving you precise measurements for every brewing method โ whether you're pulling an espresso shot or making a cold brew concentrate for the week.
The calculations here are based on the SCA Golden Cup Standard, which recommends a ratio of roughly 1:15 to 1:18 (coffee to water) for most filter-based methods. That means for a 300ml cup of pour over coffee, you'd use around 17โ20g of ground coffee. For a French press serving two people at 600ml, you're looking at approximately 34โ40g. Having exact numbers like these makes a real difference, especially when you're dialing in a new bean or a new grinder.
Each brewing method extracts coffee differently, which is why a one-size-fits-all ratio doesn't work. Espresso uses a much tighter ratio โ typically 1:2 โ so a 18g dose of coffee yields about 36g of espresso in the cup. Cold brew sits at the opposite extreme, often using a 1:8 or even 1:5 ratio because the long steep time and cold water extract less efficiently. Getting these numbers wrong by even a small margin changes the flavor profile dramatically.
For AeroPress and moka pot users, the ratios are just as specific but less commonly discussed. A standard AeroPress recipe might call for 15g of coffee to 200ml of water (1:13), while a moka pot is designed around a near-fixed ratio based on its chamber size. The calculator handles all of these automatically โ just select your method, enter your desired yield, and you get the exact coffee dose in grams.
If you're scaling up for a gathering, this tool is especially useful. Brewing filter coffee for 8 people using a 1:16 ratio into a 1.2-litre carafe? You need 75g of coffee โ a number that's easy to get wrong if you're doing the mental math mid-morning.
Always weigh your coffee rather than scooping it. A standard tablespoon of coffee can range from 5g to 8g depending on grind size and roast level, which means volume measurements are unreliable. A simple kitchen scale makes every cup far more consistent. Once you find a ratio you love using simple-calculator.online, write it down โ that's your baseline recipe.
Water quality matters too. The SCA Golden Cup Standard isn't just about ratios; it also specifies water temperature (90โ96ยฐC for most pour over methods) and mineral content. But ratio is the easiest variable to control and the one with the most immediate impact on taste.
For a standard 250ml cup using a filter or pour over method, use about 15โ17g of coffee, which follows the SCA-recommended 1:15 to 1:17 ratio. Adjust slightly based on your personal taste preference.
The SCA Golden Cup Standard defines the ideal coffee-to-water ratio as approximately 55g of coffee per litre of water, or about 1:16. This applies mainly to drip and pour over brewing โ espresso and cold brew use very different ratios.
Yes. If you prefer stronger coffee, move toward a 1:13 or 1:14 ratio. For a lighter, more delicate cup, try 1:17 or 1:18. The brewing method still sets the baseline, but personal taste is always the final guide.