Caffeine Calculator

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.