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Caffeine Calculator

Pick your drink type and servings to get an estimate of today's caffeine intake.

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Estimate your caffeine intake

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 guidance

190mg

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

  1. 1Pick your drink and the number of servings.
  2. 2Compare the total with the 400 mg general guidance.
  3. 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.

Related Coffee Guides

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.

Frequently Asked Questions

Quick answers before you buy.

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.

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.

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.

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.

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.

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.

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.

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.

No.

Milk and sugar do not change the caffeine in the coffee itself.

Only the coffee amount, bean and brew method do.

By Michael Anderson · Updated October 7, 2026