Thunder Tools

Coffee Ratio Calculator

Pick a brew method or enter your own ratio, then type either your coffee or water amount and this calculator instantly works out the other so your brew stays perfectly balanced.

Brew method
Custom ratio (1:N)
Coffee (g)
Water (g)
1 : 16 Current ratio

How it works

Choose a brew method preset (or enter your own ratio) to set how many grams of water to use per gram of coffee. Then enter either your coffee or water amount — the other field updates automatically to keep that ratio.

Tip

Weighing both coffee and water (rather than measuring water by volume) gives far more consistent results, since a gram of water is always exactly a gram, while a scoop of coffee can vary a lot depending on grind size and bean density.

More tools in this category

More categories

Thunder Tools is a small, ad-light collection of browser tools and calculators, built to be fast, free, and useful without getting in your way.

© 2026 Thunder Tools by Muted Thunder · All rights reserved.