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Updated
Caffeine Calculator: How Much Is in Your Coffee?
Use this caffeine calculator: pick your drinks and servings to see roughly how much caffeine you have had today in mg, and how it compares with the 400 mg daily guidance for most adults.
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How much caffeine is in your coffee?
Typical averages, not a measurement of your beans or brew. The 400 mg figure is the FDA's general guidance for healthy adults, not a recommendation for everyone. Check with a doctor if you are pregnant, sensitive to caffeine, or have a related health condition.
Estimated caffeine
Within guidance190mg
Of 400 mg
48%
Room left
210mg
Share of general 400 mg guidance
190 mg of 400 mg
Next: 190 mg is within the general 400 mg guidance. Add up every caffeinated drink across the day, not just coffee.
The math behind the calculator
The calculator multiplies a typical caffeine-per-serving figure for your selected drink type by the number of servings you enter, then compares the total against the FDA's general 400mg/day guidance for healthy adults to produce a percentage. It's arithmetic, not a measurement of your specific cup — actual caffeine varies by bean, roast, and brew strength.
Per-serving figures are typical averages for each brew method's usual strength and serving size, not a lab measurement of any particular bag of beans — treat the output as a reasonable estimate, not a precise figure.
How to use the result
- 1Pick your drink and the number of servings.
- 2Compare the total with the 400 mg general guidance.
- 3Add every other caffeinated drink you have today.
Common mistakes
- Treating the estimate as a lab measurement.
- Counting cups and ignoring serving size.
- Forgetting that robusta and strong brews run higher.
What this calculator assumes
Every fixed figure the maths uses, so you can check the result against your own gear.
- Caffeine per serving uses typical published averages: drip 95 mg per 8 oz, espresso 63 mg per shot, cold brew about 155 mg per 8 oz, decaf about 3 mg.
- Real caffeine varies with bean (robusta has roughly twice arabica), dose and brew time, so treat results as estimates.
- The 400 mg daily figure is the FDA's general guidance for healthy adults, not a target. Pregnancy and some conditions call for less.
Control Strength at the Source
A consistent grind makes it easier to brew at a predictable strength, so your caffeine intake stays consistent cup to cup too.
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Frequently Asked Questions
Quick answers before you buy.
How much caffeine is in a cup of coffee?
It varies a lot by brew method and strength, but a typical 8 oz cup of drip coffee runs around 95mg, cold brew tends to run higher (around 150mg or more due to a stronger concentrate), and a single espresso shot has roughly 63mg despite its small size — it's just far more concentrated.
How much caffeine is too much in a day?
The FDA cites up to 400mg per day as generally not associated with dangerous, negative effects for most healthy adults — that's roughly 4-5 cups of drip coffee.
This isn't a recommendation for everyone, though; sensitivity varies, and pregnant people and those with certain health conditions are generally advised to consume less.
Does darker roast coffee have more or less caffeine?
Roast level has a smaller effect on caffeine than most people assume, and dark roast is not reliably higher or lower — measured by weight, roast level barely changes caffeine content.
Measured by volume (scoops), light roast beans are slightly denser, so a scoop can contain marginally more caffeine than the same scoop of dark roast.
Why does cold brew have more caffeine than hot coffee?
It's usually a brewing-ratio effect, not an extraction effect — cold brew concentrate is typically made with a much higher coffee-to-water ratio than drip coffee, so an equal serving size ends up with more caffeine, even though cold water actually extracts caffeine less efficiently than hot water.
How many cups of coffee is 400mg of caffeine?
Using this tool's typical figure of about 95mg per 8 oz cup of drip, 400mg is roughly four cups.
Real cups vary by bean, strength and size, so treat it as an estimate.
Does decaf coffee have caffeine?
Yes, a small amount.
Decaf is not caffeine-free, and the amount varies by product.
This calculator does not model decaf, so count it separately if you want to be careful.
Does a bigger cup mean more caffeine?
Generally yes, if the strength is the same.
A 16 oz mug of drip holds about twice an 8 oz cup.
Count servings by size, not by the number of mugs.
When should I stop drinking coffee to sleep well?
It varies by person.
Caffeine can linger in the body for hours, so many people cut off coffee in the early afternoon.
If sleep suffers, try moving your last cup earlier and watch the effect.
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