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Caffeine Calculator

Know exactly when to stop caffeine for undisturbed sleep. Calculate your personal caffeine cutoff time based on your bedtime.

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Coffee (8oz)
95 mg caffeine
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Espresso (1 shot)
45 mg caffeine
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Green Tea (8oz)
40 mg caffeine
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Black Tea (8oz)
30 mg caffeine
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Energy Drink
80 mg caffeine
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Large Coffee (16oz)
160 mg caffeine
Your Caffeine Cutoff Time
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Caffeine Levels Through Evening

6 PM
9 PM
11 PM
Bedtime

How Caffeine Affects Sleep

Caffeine has an average half-life of 5-6 hours, meaning if you consume 200mg at noon, you'll still have about 100mg in your system by 6pm and 50mg by midnight. Thisๆฎ‹็•™ caffeine can significantly impact your sleep quality, even if you can still fall asleep.

Caffeine Content in Common Beverages

Espresso (1 oz)63 mg
Coffee (8 oz)95 mg
Coffee (12 oz)140 mg
Coffee (16 oz)180 mg
Black Tea (8 oz)47 mg
Green Tea (8 oz)28 mg
Energy Drink80-100 mg
Cola (12 oz)34 mg

Tips for Better Sleep

Track your intake: Many people underestimate their daily caffeine consumption. Remember caffeine hides in sodas, chocolate, and even some medications.

Set a hard cutoff: Try to stop caffeine consumption at least 6 hours before bed. For most people, this means no coffee after 2-3pm.

Consider decaf: If you enjoy the ritual of coffee or tea, switch to decaf in the afternoon. You'll still get the ritual without the sleep disruption.