Caffeine per Drink Calculator
Estimate the caffeine in your drinks and compare with a 400 mg daily guideline.
Your result
Caffeine content varies by brand and brew. Around 400 mg a day is a commonly cited limit for healthy adults, and less is advised before bed.
Medical disclaimer: This tool is for education and is not medical advice. Read more.
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Frequently asked questions
What does the Caffeine per Drink Calculator do?
Estimate the caffeine in your drinks and compare with a 400 mg daily guideline. Enter your values and the result and chart update instantly.
How accurate is it?
It uses published, widely used formulas. Results are estimates for education and planning, not a diagnosis. Talk to a qualified clinician about decisions affecting your health.
Is my information stored or shared?
No. All calculations run in your browser and nothing you type is sent to a server or saved.
What can I search to find this tool?
People find it by searching for: how much caffeine in coffee; caffeine content drinks; caffeine from energy drink.