Caffeine Calculator
Add up today’s coffee, tea and energy drinks, or estimate the caffeine in your own brew.
Brewed coffee
8 fl oz · ~96 mg
Espresso (single shot)
1 fl oz · ~63 mg
Latte or cappuccino (1 shot)
1 shot · ~63 mg
Instant coffee
8 fl oz · ~62 mg
Decaf brewed coffee
8 fl oz · ~2 mg
Black tea
8 fl oz · ~48 mg
Green tea
8 fl oz · ~29 mg
Cola
8 fl oz · ~33 mg
Energy drink
8 fl oz · ~79 mg
Total today
192 mg
Guideline
400 mg/day
FDA, healthy adults
Left today
208 mg
48% of the 400 mg guideline.
Drink values are typical amounts from the Mayo Clinic’s caffeine chart; real drinks vary a lot by brand and recipe. This calculator is for information only and isn’t medical advice.
How much caffeine is too much?
The U.S. Food and Drug Administration says up to 400 mg a day is not generally associated with negative effects for healthy adults, which the FDA equates to roughly two to three 12 oz cups of coffee. The European Food Safety Authority (EFSA) reached the same 400 mg figure in 2015 and added that single doses up to about 200 mg (roughly 3 mg per kilogram of body weight) don’t raise safety concerns for healthy adults.
During pregnancy the guidance is lower: the American College of Obstetricians and Gynecologists (ACOG) advises under 200 mg a day, and EFSA uses the same number. People who are sensitive to caffeine, take certain medications or have heart conditions should ask their doctor what’s right for them.
Two ways to use this calculator
- My caffeine today adds up typical servings of coffee, espresso, tea, cola and energy drinks and compares the total with the guideline.
- Caffeine in my brew estimates caffeine from the grams of coffee you brew with, which is more useful for home coffee, because a strong home pour over can carry far more caffeine than the 96 mg “average cup”.
Why the numbers are estimates
Caffeine varies with the coffee species (robusta has roughly twice as much as arabica), the specific beans, the roast and how you brew. Café drinks vary even more: a large drip coffee from a coffee chain can contain more than twice the 96 mg “average cup”. Treat every number here as a guide, not a lab result.
Useful for this
Coffee scale with timer
Weighing coffee and water is the single biggest step toward repeatable cups. A timer helps with pour over and espresso.
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Frequently asked questions
How much caffeine is in a cup of coffee?
The Mayo Clinic lists about 96 mg for an 8 fl oz cup of brewed coffee, and about 63 mg for a 1 fl oz shot of espresso. Home-brewed coffee made with more grounds can contain considerably more.
Does espresso have more caffeine than coffee?
Per ounce, yes — espresso is far more concentrated. Per drink, usually not: a single shot (about 63 mg) has less caffeine than an 8 oz cup of drip coffee (about 96 mg).
Does dark roast have less caffeine?
Only slightly, and it depends on how you measure. Roasting barely destroys caffeine, but dark beans are lighter and larger, so a scoop of dark roast weighs less than a scoop of light roast. Measured by weight, the difference is small.
How much caffeine is in decaf?
Not zero: the Mayo Clinic lists about 2 mg for an 8 oz cup of brewed decaf.
Related guides
How Much Caffeine Is in a Cup of Coffee? (By Drink and Brew Method)
An 8 oz cup of brewed coffee has about 96 mg of caffeine; a shot of espresso about 63 mg. See amounts by drink, why they vary, and how much is too much.
5 min readEspresso vs. Coffee: What’s Actually Different (Caffeine, Taste, Beans)
Espresso and coffee use the same beans — the difference is pressure, grind and ratio. Compare caffeine, taste, cost and gear to see which suits you.
5 min read