Roast level

Definition

Roast level is how far the bean was taken past drying and Maillard into development. Weight loss of ~12–14% is often city / light-medium; ~16–18% darker. Names (City, Vienna, French) are trade slang. Colour meters and Agtron exist; a kitchen scale is a crude proxy. Darker roasts degas faster, taste more bitter-sweet, and hide origin acidity.

Calculators that use this

• Coffee roasting

  Roasting Weight Loss Calculator

  Turn green and roasted mass into percent weight loss and yield. A crude roast level proxy: more loss usually means a darker roast.

• Coffee roasting

  Bean Degassing Calculator

  Estimate a peak flavour window from roast level and days since roast. Light roasts rest longer; dark roasts degas faster. A calendar, not a CO₂ meter.