Daily How Much

For most healthy adults, going past 400 mg a day can trigger side effects; pregnancy and teens call for lower limits.

A standard 8-ounce decaf coffee usually contains 2–15 mg of caffeine, so it’s low-caffeine, not caffeine-free.

Decaf coffee still carries caffeine—often 2–15 mg in an 8-oz cup—so the exact hit depends on the beans and how you brew.

An 8-oz mug usually has 40–70 mg of caffeine, set by leaf grade, water temp, and steep time.

A standard 8-ounce drip coffee often lands between 75 and 165 mg of caffeine, with the final number driven by beans, grind, dose, and brew time.

Most healthy adults can stay under 400 mg of caffeine per day, while pregnancy is usually capped at 200 mg, and teens do better with far less.

For most adults, daily intake above 400 mg, or large doses taken close together, can push caffeine into a danger zone with fast-rising side effects.

A typical 8-oz mug of dark roast brewed coffee lands near 95 mg of caffeine, with real-life cups often ranging from 70–140 mg.

An 8-oz mug of brewed coffee often lands near 80–100 mg of caffeine, yet roast, grind, and brew time can swing it wide.

An 8-oz cup of Earl Grey tea often lands around 30–60 mg of caffeine, with the swing driven by leaf amount, steep time, and water heat.