About the Caffeine Intake Calculator
Most people take in caffeine from several sources in a day without adding it up. This calculator lets you enter how many cups of brewed coffee, espresso shots, black tea, green tea, cola, energy drinks and dark chocolate bars you have had, and gives the total in milligrams. It compares the total with a daily limit that you choose. Type how many of each drink you have and the caffeine intake appears at once, with a few related figures underneath, and you can copy the result with one tap. The sums run in your browser, so nothing you enter is uploaded.
Updated October 2026
How to use the Caffeine Intake Calculator
- 1Enter how many of each drink you have.
- 2Pick the units or options from the menus if the caffeine intake tool offers them.
- 3Read the caffeine intake in the large result box.
- 4Look at the extra rows for related figures.
- 5Press Copy result to keep the answer.
When you need the caffeine intake
Health authorities say up to 400 mg a day is not usually a concern for healthy adults. Pregnant women are often advised to stay under 200 mg. People sensitive to caffeine, or with anxiety, heart rhythm problems or sleep trouble may choose less.
The amounts are averages: a cup of coffee can hold anywhere from 60 to over 200 mg depending on the beans, strength and size. Café drinks and some energy drinks contain much more than the typical figure, so check labels when you can.
How the caffeine intake is worked out
Total caffeine = number of each drink × its typical milligrams, added together. Typical amounts: brewed coffee 95 mg, espresso 63 mg, black tea 47 mg, green tea 28 mg, cola can 34 mg, energy drink 80 mg, dark chocolate 25 mg. Two cups of coffee, a cup of tea and a can of cola add up to 271 mg, which is 68 percent of a 400 mg limit, leaving 129 mg. Six energy drinks would reach 480 mg, over the limit.
Every answer on this page comes from that one rule, so you can check any result by hand with a calculator. The figures shown underneath, such as other units, are conversions of the same answer.
- Seven drinks
- Three daily limits
- Share of the limit and cups of coffee
Mistakes to avoid with caffeine intake
Caffeine stays in the body for hours, so late drinks can disturb sleep even if the total is small. This tool is a rough counter, not medical advice. Ask a doctor about your own limit if you are pregnant, have a health condition or take medicines.
On phone and computer
On a phone, type into the boxes one after another and read the caffeine intake underneath; Copy result puts it on the clipboard for a message or a note. On a computer the inputs sit on the left and the answer on the right, so you can change one figure and watch the caffeine intake move. The caffeine intake calculator works the same on both. Caffeine is one part of a daily routine. Check your water with Water Intake Calculator, your rest with Sleep Calculator, your food with Calorie Calculator and your weight with BMI Calculator.
Features
- Averages vary a lot
- Late caffeine affects sleep
- Check labels
- Clear messages when the caffeine intake inputs make no sense
- Copy the result with one tap
- Private: nothing is uploaded
Frequently asked questions
How do I calculate caffeine intake?
Total caffeine = number of each drink × its typical milligrams, added together. Typical amounts: brewed coffee 95 mg, espresso 63 mg, black tea 47 mg, green tea 28 mg, cola can 34 mg, energy drink 80 mg, dark chocolate 25 mg. Two cups of coffee, a cup of tea and a can of cola add up to 271 mg, which is 68 percent of a 400 mg limit, leaving 129 mg. Six energy drinks would reach 480 mg, over the limit.
What is the formula for caffeine intake?
Total caffeine = number of each drink × its typical milligrams, added together. Typical amounts: brewed coffee 95 mg, espresso 63 mg, black tea 47 mg, green tea 28 mg, cola can 34 mg, energy drink 80 mg, dark chocolate 25 mg. The caffeine intake calculator applies it exactly and rounds only the displayed answer to six significant figures.
How much caffeine is safe?
About 400 mg a day for most healthy adults. Lower for pregnancy and for some medical conditions.
Does decaf coffee have caffeine?
A small amount, usually 2 to 15 mg per cup.
How long does caffeine last?
Its half-life is around 5 hours, so half of an afternoon coffee may still be in your system in the evening.
Is this caffeine intake calculator free and private?
Yes. It is free, needs no account and runs in your browser, so the numbers you type are not uploaded or stored.