Coffee Brewing
Calculator
A free coffee brewing calculator for V60, AeroPress, French Press and 9 more methods. Follow real-time steps, dial in your ratio, and log every brew.
Frequently Asked Questions
What is a coffee brewing calculator?
A coffee brewing calculator helps you determine the right coffee-to-water ratio and guides you step-by-step through the brewing process. Calculate.Coffee supports 12 brewing methods including V60, AeroPress, French Press, Orea, and Cezve — giving you precise dose, water, and temperature guidance for every brew.
What's the difference between V60 and AeroPress?
The V60 is an open pour-over dripper that produces a clean, complex cup by controlling how water flows through the grounds. The AeroPress is a closed immersion brewer that uses gentle pressure, making it faster and more forgiving. V60 rewards careful pouring technique; AeroPress is more versatile and great for experimentation.
How do I calculate the coffee-to-water ratio?
The standard specialty coffee ratio is 1:15 to 1:17 — meaning 1g of coffee per 15–17g of water. For example, 15g of coffee with 250g of water gives a 1:16.7 ratio. Calculate.Coffee computes the water amount automatically when you enter your dose and select a ratio.
What grind size should I use for each method?
Grind size varies by brewing time and method. V60 and Orea use medium-fine grounds, AeroPress works with medium-fine to medium, French Press requires coarse grounds, and Cezve (Turkish coffee) uses an extra-fine powder. Calculate.Coffee shows the recommended grind size for every recipe.
What water temperature is best for pour-over coffee?
Most specialty coffee recipes use water between 90°C and 96°C (194–205°F). Lighter roasts benefit from higher temperatures (94–96°C) to extract fully, while darker roasts can use slightly cooler water (90–92°C) to avoid bitterness. Calculate.Coffee lets you set your target temperature for each brew.
What is the 4:6 method by Tetsu Kasuya?
The 4:6 method, created by 2016 World Brewers Cup champion Tetsu Kasuya, splits total water into two phases — 40% controls acidity and sweetness, 60% controls strength. By adjusting the ratio and size of pours in each phase, you can precisely dial in the flavor profile of your cup.
How does James Hoffmann's V60 recipe work?
James Hoffmann's Ultimate V60 is a three-phase technique — a 45-second bloom with twice the coffee weight in water, then two slow pours to reach 60% and 100% of the total water, followed by a gentle swirl to level the grounds. It is designed to be consistent and repeatable, producing a clean and balanced cup.
Can I save my brew recipes?
Yes. After completing a brew, Calculate.Coffee prompts you to log it with notes on dose, ratio, grind, taste ratings, and flavor tags. Your brew log is stored locally on your device — no account required. You can also brew again from any logged entry with one tap.
Does Calculate.Coffee work offline?
Yes — Calculate.Coffee is a Progressive Web App (PWA). After your first visit, it works fully offline. You can install it on your home screen like a native app and use all brewing guides and your brew log without an internet connection.