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For most adults, more than 400 mg of caffeine a day starts to raise the odds of side effects, poor sleep, and shaky jitters.

Many obstetric and public-health sources cap caffeine at 200 mg per day during pregnancy, counting coffee, tea, soda, chocolate, and caffeine-containing meds.

For most healthy adults, going past 400 mg of caffeine in a day is the point where side effects and risk climb fast.

A brewed coffee often lands around 80–100 mg of caffeine per 8 oz, while black tea often lands around 40–60 mg, with steep time and serving size driving the

A decaf Americano still contains caffeine, usually in the single digits to a few dozen milligrams, based on shots and beans.

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.