Caffeine

A pot of coffee contains 1140–2400mg of caffeine. We break down the math by brand, roast, and brewing method so you can track your real intake.

Find out how many cups of coffee you can safely drink daily. Learn the FDA’s 400 mg caffeine limit, how brewing methods change counts, and when to cut back.

Light roast coffee has slightly more caffeine by volume, but dark roast wins by weight. We break down the science of bean species, brewing, and extraction.

Find out how much coffee is too much. Learn the FDA’s 400mg caffeine limit, what happens if you exceed it, and how to track your intake for safety.

Vietnamese coffee caffeine content is high, often 100-250mg per phin-brewed cup due to Robusta beans. Understand the science and calculate your perfect dose.

Find out exactly how much caffeine is in iced coffee from Starbucks, Dunkin’, and more. Learn why cold brew has more and how ice dilution changes your intake.

Find out how much caffeine is in your black coffee. We break down the exact numbers from espresso to cold brew, plus the science behind the variation.

Get the official USDA figure for caffeine in a teaspoon of instant coffee. We explain the average content, variations by brand, and brewing tips. Learn more!

Discover the caffeine content in a coffee bean, from Arabica’s 1.5% to Robusta’s 2.5%, and why roast level barely changes the actual caffeine per cup.

Learn exactly how long coffee stays in your system, from caffeine half-life to the 12-hour quarter-life rule. Discover how genetics and habits affect you!

Uncover how caffeine is removed from coffee to create decaf. Get a clear breakdown of the top processes and what they mean for your cup. Explore the details!

How does dichloromethane extract caffeine from coffee? We detail the solvent process, FDA safety limits, and key reasons for low extraction yields. Read on!