Beverage Caffeine Content Calculator
Caffeine content is not standardized: a cup of coffee, a shot of espresso, a tea or an energy drink can each span a wide range depending on the product and how it is made. This calculator lets you total your daily caffeine by entering the milligrams per serving for your drink and how many servings you have, then shows the total alongside the percentage of a daily limit you set. The FDA has cited 400 mg a day as not generally associated with negative effects in healthy adults; the limit here is editable for your own situation.
Caffeine total formula
total caffeine = caffeine per serving * servings
percent of limit = total / daily limit * 100
remaining = daily limit - total
servings left = remaining / caffeine per serving
Enter the per-serving milligrams for your specific drink. The remaining and servings-left figures help you pace intake under your chosen limit.
FDA caffeine context
- A typical 8 ounce brewed coffee holds roughly 80 to 100 mg of caffeine (FDA).
- The FDA has cited 400 mg per day as not generally linked to negative effects in healthy adults.
- Energy drinks and espresso vary widely; check the label.
- Decaf is not caffeine free; it contains a small amount.
- Sensitivity varies; pregnant people should seek clinical advice.
Caffeine content: frequently asked questions
How much caffeine is in a coffee?
The FDA notes a typical 8 ounce cup of brewed coffee contains roughly 80 to 100 milligrams of caffeine, but the amount varies widely by bean, roast, brew method and cup size. Energy drinks and espresso vary even more. Because there is no single fixed value, you enter the caffeine per serving for your drink.
How much caffeine is safe per day?
The FDA has cited 400 milligrams a day, about four or five cups of coffee, as an amount not generally associated with negative effects in healthy adults. Tolerance varies, and pregnant people and those with certain conditions should consult a clinician. The daily limit here is an editable input, defaulting to 400 mg.
Why is caffeine per serving an input?
Caffeine content is not standardized across products and brewing styles, so no single number is correct for all coffees, teas or energy drinks. Read the label where available, or use the FDA's general ranges, and enter the figure for your specific drink. The calculator then totals your intake exactly.
How is total daily caffeine calculated?
Total caffeine equals caffeine per serving times the number of servings. The calculator then divides your total by your chosen daily limit to show what percentage of the limit you have reached, helping you keep intake within a target.
Does decaf contain caffeine?
Yes, a small amount. Decaffeinated coffee is not caffeine free; an 8 ounce cup may contain a few milligrams. If you are tracking closely, enter the per-serving figure for decaf rather than assuming zero.
Official sources
Reviewed by the CalculatorHub team, edited by James Graham, 17 June 2026. See our methodology.