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Most healthy adults should stay at 200 mg or less per dose and 400 mg or less per day, since pure caffeine powder is easy to overmeasure.

For many adults, 200 mg of caffeine within 6 hours of bedtime can shorten sleep and make it lighter.

Most pregnancy guidance caps caffeine at 200 mg a day, counting coffee, tea, cola, chocolate, and some medicines.

Most pregnancy guidance sets a daily caffeine limit at 200 mg from all sources, like coffee, tea, cola, chocolate, and some meds.

For most healthy adults, caffeine often turns “bad” once your total goes past about 400 mg in a day, or sooner if it messes with sleep, nerves, or your pulse.

Most adults can handle up to 400 mg of caffeine a day, while pregnancy usually calls for staying under 200 mg.

A 12-ounce cup of brewed coffee often lands around 140–200 mg of caffeine, with bean type and brew style pushing it higher or lower.

A 20-ounce bottle of regular Coca-Cola has about 57 mg of caffeine.

A typical 8-oz cup of tea lands around 15–60 mg of caffeine, with the leaf style and your brew choices doing most of the shifting.

A typical 8-oz cup of brewed coffee lands near 80–165 mg of caffeine, with your beans and brew method driving the swing.