About Ratio Kettle

A gram scale, your everyday brewer and a recipe you can repeat. Scale a pour, fill a travel mug, or work out how much ice belongs in the carafe.

How the guides are made

Each guide starts with a practical question. It shows the inputs, walks through an example and links to references so you can check the method for your own project. The numbers in the examples are illustrative.

The publisher used AI assistance to draft these guides and create worked examples. The calculator runs in your browser. Its results depend on the measurements you enter.

References for this notebook

Hario’s Alpha Dripper brewing directions
Hario’s one-cup V60 recipe from James Hoffmann
Counter Culture Coffee’s flash-brew recipe
Blue Bottle’s pour-over brewing guide

Contact and corrections

Email the publisher with the guide title, the measurement or passage in question, and any supporting reference. You can also use this address for privacy inquiries.