Caffeine Intake Calculator
Caffeine adds up across coffee, tea, energy drinks and soda, and it is easy to lose track of the daily total. This calculator sums the caffeine from your drinks and compares it with a daily limit you can edit. Because caffeine content varies enormously by product and serving, enter the milligrams per serving from your labels and how many servings you had. The default limit reflects the FDA's commonly cited 400 mg figure for healthy adults; adjust it for your own situation. This is general information, not medical advice.
Caffeine total formula
drink caffeine = mg per serving * servings
total = coffee + tea + energy drink
percent of limit = total / daily limit * 100
remaining = daily limit - total
Enter the milligrams per serving from your labels. The total is the sum across drinks; the percent and remaining figures compare it with your editable daily limit.
Using the calculator
- The FDA has cited 400 mg per day as not generally linked to negative effects in healthy adults.
- Per-serving caffeine varies widely; always use your product's label where available.
- Pregnant people and those with health conditions should set a lower limit and seek medical advice.
- The tool totals intake; it does not model how caffeine clears over the day.
- This is general information, not medical advice.
Caffeine intake: frequently asked questions
How much caffeine is safe per day?
The US Food and Drug Administration has cited 400 milligrams a day, about four or five cups of brewed coffee, as an amount not generally associated with negative effects for healthy adults. This is a general figure, not a personal prescription. People vary in sensitivity, and pregnant people and those with certain conditions should seek lower limits and medical advice. The daily limit here is editable.
How much caffeine is in common drinks?
Caffeine varies widely by product and serving size, so enter the amounts on your labels. As rough guides the FDA notes brewed coffee around 80 to 100 mg per 8 ounce cup, with energy drinks and shots varying widely. Always read the actual product information where available, because brewing and brand differences are large.
Why are the per-drink amounts editable?
Caffeine content is not fixed: it depends on the bean, the brew, the steep time, the brand and the serving size. To stay accurate, this calculator lets you enter the milligrams per serving for each drink yourself rather than assuming a single hardcoded value.
Does caffeine leave the body quickly?
No. Caffeine has a half-life of several hours in most adults, so a late-afternoon dose can still affect sleep. This calculator totals your intake for the day; it does not model how caffeine clears over time. Spacing intake earlier in the day is a common strategy for protecting sleep.
Official sources
- U.S. Food and Drug Administration: Spilling the Beans: How Much Caffeine is Too Much.
- USDA FoodData Central: caffeine content of foods and beverages.
Reviewed by the CalculatorHub team, edited by James Graham, 19 June 2026. See our methodology.