What is roasted weight in coffee roasting?

Roasted weight is the weight of a batch of coffee after roasting is complete and the beans have cooled. Because roasting drives off moisture and CO₂, roasted weight is always less than green weight - the difference being the roast loss.

Weighing after roasting gives you two useful data points: the actual roast loss for that batch (which reflects roast level, starting moisture content, and development) and an accurate count of roasted coffee available for packaging or brewing. A heavier roast loss percentage generally indicates a darker roast; lighter roasts typically lose less mass.

Tracking roasted weight alongside green weight over time gives home roasters a simple running record of their inventory, helps predict yield for a given batch size, and provides an additional data point for comparing roasts. If a batch loses significantly more weight than usual at the same intended roast level, it may indicate the beans started with higher moisture content or that the roast ran longer or hotter than intended.