About Agitative

Making good coffee at home comes down to a handful of variables that are easy to name and easy to get slightly wrong: how much coffee against how much water, how fine or coarse to grind, how long to let the grounds bloom before the main pour, and how the brew actually tastes once it’s in the cup. None of these questions are hard on their own, but juggling all of them by feel, cup after cup, is where a lot of home brewing stalls out at “fine” instead of getting to “good.”

Agitative exists to make those variables concrete. Instead of long guides you have to read end to end, the site is built around a set of small, single-purpose calculators, each aimed at one part of the brewing process. The Coffee-to-Water Ratio Calculator solves for dose, water, or ratio from any two of the three, with presets for common methods. The Grind Size Guide matches a brew method to its typical particle-size range and brew time. The Brew Timer builds a bloom-and-pulse pour-over schedule with cumulative water targets. The TDS & Extraction Yield Calculator turns a refractometer reading into an Extraction Yield percentage using the SCA brewing-control formula, and flags whether it falls in the commonly used 18-22% range. The Caffeine Estimate Calculator gives a rough caffeine figure from your dry coffee dose, as a range rather than a false-precision number. And the Bloom Timer works out how much water and how long to bloom, adjusted for how many days your beans have been off roast.

Beyond the calculators, the blog and learnsection cover the reasoning behind the numbers — ratios, grind, extraction, caffeine, and brewing equipment — and the Museum of Coffeeis a browsable collection of coffee’s origins, brewing devices, the coffee plant itself, and café culture, with every entry, image, and fact drawn from Wikipedia and Wikimedia Commons.

A few things worth stating plainly. Agitative is an independent site, not affiliated with any coffee roaster, equipment brand, or certification body. It is supported by advertising, which is how the tools stay free with no account required. Every result the tools produce — a ratio, a grind recommendation, a pour schedule, an extraction reading, a caffeine estimate, a bloom plan — is a general estimate built on the numbers you enter and on widely used brewing conventions, not a laboratory measurement or a guarantee of taste. Trust your own palate over any single number, and if something looks off in a tool or an article, or a calculator is missing that would help, the contact page is the place to say so.