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To best minimize your risk, consume less than 100 milligrams of caffeine per day, or no more than 1 to 2 cups of coffee. Caffeine may also have adverse impacts in children, such as disturbing their sleep, and intake should be limited to 2.5 milligrams of caffeine per kilogram of their body weight per day.
Experts recommend that you should limit your daily consumption to 200mg of caffeine a day. In coffee terms, this works out at about two cups of instant, or just one cup of filter coffee. This is assuming you are drinking from average sized coffee mugs, not the bucket-sized cups at your local coffee bar. The 200mg recommendation includes all of your caffeine sources, not just coffee.