Understanding Roast Profiles: A Beginner's Guide

A roast profile is simply the record of bean temperature over time — but reading that curve well is what separates a repeatable roast from a lucky one.

Charge temperature

The temperature of the drum when beans go in sets the tone for the whole roast. Charge too hot and you risk scorching the bean surface before the centre catches up; charge too cool and you'll fight to build enough momentum before first crack.

First crack and development time

First crack marks the start of the development phase — the stretch of roasting where sugars caramelise and the flavour you'll actually taste gets built. Development time ratio (development time as a percentage of total roast time) is a useful number to track batch to batch, even before you start chasing specific flavour outcomes.

Most roasters don't need a new profile every week. They need to hit the same profile reliably, batch after batch.