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Most healthy adults can have up to 400 mg caffeine a day, with lower limits in pregnancy and for teens.

Most cans land between 80 and 200 mg of caffeine per serving, yet bigger sizes and “energy shots” can push past 300 mg.

A typical 8-oz brewed serving lands around 30–80 mg of caffeine, shaped by leaf amount, water heat, and steep time.

One small 8.4-oz Red Bull contains 80 mg of caffeine, while larger cans typically hold 114–198 mg depending on size.

A latte usually lands between 60 and 200 mg of caffeine, shaped by how many espresso shots are in your cup.

Many adults stay alert with 50–200 mg spaced out, while keeping total daily intake at 400 mg or less.

A fresh apple contains 0 mg of caffeine, so any “kick” you feel comes from carbs, hydration, or caffeine added in apple-flavored products.

One 12 fl oz can of Diet Mountain Dew has 54 mg of caffeine, so it lands in the mid-range for caffeinated soda.

A 12-oz can of Diet Dr Pepper contains 41 mg of caffeine, which sits in the same range as many caffeinated sodas.

Most clinicians set a daily caffeine cap of 200 mg while pregnant, counting coffee, tea, soda, chocolate, and some medicines.