RoastLog

How to roast coffee at home

Roasting your own coffee is more forgiving than it sounds. Green beans are cheap, the gear can be something you already own, and every batch teaches you something. The goal is simple: drive enough heat into the beans to develop flavor, get them evenly browned, and stop before they scorch. Here are the three common methods home roasters start with, and the stages every roast passes through.

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Three ways to roast at home

Cast-iron pan or wok. The cheapest way in. Heat the pan to medium-high, add about 100–150 g of green beans in a single layer, and stir constantly so they brown evenly. It demands attention and produces some smoke, but it works and it teaches you what first crack sounds like.
Air popcorn popper. A classic hack. The hot moving air agitates and roasts at the same time, giving surprisingly even results for small 60–90 g batches. Roast outdoors or under a hood — poppers throw chaff and smoke — and watch they don't overheat.
Dedicated home roaster. Air roasters like the SR540/SR800 or small drum roasters such as the Behmor give you fan and heat control, repeatable profiles, and bigger batches. They cost more but remove most of the guesswork once you learn the controls.

The stages of a roast

Whatever the method, the beans move through the same phases. Drying comes first: the beans shed moisture, turn from green to yellow, and smell grassy or like toast. Next is the Maillard / browning phase, where sugars and amino acids react, the color deepens to tan and brown, and aromas turn bready and nutty.

Then comes first crack — an audible popping, like faint popcorn — which signals the start of real flavor development. The window after first crack is where you decide your roast level. Pull early for a light roast, hold longer for medium, and push toward second crack for dark. The moment you remove the beans from heat is the drop.

A few habits that pay off

Cool the beans fast — a colander and a fan stops the roast and prevents baking.
Rest roasted beans 12–48 hours before brewing so trapped CO2 escapes.
Weigh green and roasted weight; the loss tells you how far the roast went.
Write down what you did. Memory fades faster than a roast cools.

That last habit is the one that turns a hobby into a craft. RoastLog captures weight, first crack, drop time, roast level and a tasting note for every batch — and computes weight-loss % and development time ratio automatically — so your next roast starts from data instead of a guess.

Log your first roast →