Coffee Calculator
Adjusts the ratio: Mild uses more water, Extra Strong uses less
Multiplies all quantities
Select a brew method
Choose your brew method and enter a water or coffee amount to get precise measurements for the perfect cup.
How to Use the Coffee Calculator
Choose Your Brew Method
Select from 11 brew methods including Pour Over, French Press, Espresso, AeroPress, Cold Brew, and more. Each method has its own recommended ratio, grind size, brew time, and water temperature preset automatically.
Set Strength and Servings
Pick your preferred strength (Mild, Balanced, Strong, or Extra Strong) and the number of servings you want to brew. The strength setting adjusts the coffee-to-water ratio to match your taste preference.
Enter Water or Coffee Amount
Use the Calculate toggle to choose whether you're solving for coffee (enter water amount) or water (enter coffee amount). The bidirectional calculator works both ways — enter what you have to find out what you need.
Read Your Recipe
The results show coffee grams, tablespoons, water amount, brewed yield (accounting for absorption), plus grind size and brew time guidance. Use the method comparison chart to see how your chosen ratio compares to all other methods.
Frequently Asked Questions
What is the best coffee-to-water ratio?
The Specialty Coffee Association (SCA) recommends a ratio between 1:15 and 1:18 (coffee to water) for most filter brewing methods, with 1:16 being the widely accepted "Golden Cup" standard. This means 62.5g of coffee per liter of water. However, the best ratio is personal — it depends on your brew method, grind size, bean roast level, and taste preferences. Espresso uses dramatically different ratios (1:2 for normale), while cold brew concentrate often runs as low as 1:8. Start with the method default and adjust from there until you find your ideal strength.
How many tablespoons of coffee per cup?
A standard "cup" in coffee brewing is typically 6 fl oz (180ml), though mugs are usually 8–12 fl oz. At a 1:16 ratio, a 6 fl oz cup (about 180ml) requires approximately 11g of coffee, which is roughly 1.8 tablespoons. For an 8 fl oz mug (240ml), you need about 15g or 2.5 tablespoons. The common rule of "2 tablespoons per 6 oz cup" equates to a ratio of about 1:15 — slightly stronger than the SCA Golden Cup. One level tablespoon of ground coffee weighs approximately 5–6 grams depending on grind size and density.
Why is my brewed yield less than the water I started with?
Coffee grounds absorb water during brewing — approximately 1.995 grams of water per gram of dry coffee grounds. This absorption happens regardless of brew method. For a typical 300ml brew using 18.75g of coffee, you lose about 37ml to absorption, leaving roughly 263ml in your cup or carafe. Cold brew has higher absorption due to the long steep time. Espresso has minimal absorption because the pressurized extraction forces most water through the puck. The brewed yield shown in results accounts for this absorption so you know your actual cup volume.
Does grind size affect the ratio I should use?
Grind size and ratio interact, but they serve different purposes. Grind size primarily controls extraction rate and flavor profile — finer grinds extract faster and risk over-extraction, while coarser grinds extract slower. Ratio controls concentration and strength. If you're getting sour, weak coffee, grind finer before reducing ratio (you may be under-extracting). If you're getting bitter, harsh coffee, try coarser before adding more water. Use the recommended grind size for each method as your baseline. Only adjust ratio after you've confirmed your grind size is correct for your equipment and bean.
What's the difference between Ristretto, Espresso, and Lungo?
All three use the same very fine grind and high-pressure extraction, but differ in water volume relative to coffee dose. Ristretto ("restricted") uses a 1:1.5 ratio — typically 18g coffee to 27ml water extracted in 15–20 seconds. It's sweeter and more concentrated. Standard Espresso uses a 1:2 ratio (18g coffee to 36ml water) in 25–30 seconds — the classic balanced shot. Lungo ("long") uses a 1:3 ratio (18g to 54ml water) in 35–45 seconds, producing a larger, slightly less intense shot. The total extraction time determines flavor — shorter pulls are sweeter and more syrupy, longer pulls become more bitter.
How do I measure coffee without a scale?
While a kitchen scale gives the most consistent results, you can use tablespoons as an approximation. One level tablespoon of ground coffee weighs roughly 5–6 grams (the calculator uses 6g as the conversion factor). For a 300ml pour over at 1:16 ratio requiring 18.75g, that's approximately 3 tablespoons. Be aware that tablespoon measurements vary with grind size — finely ground coffee packs more densely than coarse, so a tablespoon of espresso grind weighs more than a tablespoon of French Press coarse grind. A basic digital kitchen scale (even a $10 model) dramatically improves consistency and is the single best coffee upgrade most home brewers can make.