Caffeine

Definition

Caffeine is an alkaloid extracted with water. Arabica beans hold roughly 1.2% by dry mass; robusta about twice that. Brew method and contact time change how much ends up in the cup. Population guidelines (FDA ~400 mg/day, EFSA 3 mg/kg, pregnancy often 200 mg) are not medical advice. These calculators estimate milligrams from dose and a simple extraction factor — they do not assay your beans.

Calculators that use this

• Health, economics & lifestyle

  Caffeine Content Calculator

  Estimate milligrams of caffeine from dry dose, arabica vs robusta, and brew method. An extraction sketch, not a lab assay or medical advice.

• Health, economics & lifestyle

  Daily Caffeine Limit Calculator

  Sketch a daily caffeine milligram cap from body weight and pregnancy status using public-health style rules of thumb. Educational only.