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Caffeine Calculator: How Much Caffeine Is Too Much?

Add up the caffeine in your coffee, tea, soda and energy drinks for a day and compare it with the FDA’s 400 mg for most adults or your own limit.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Scope: an estimate of how much caffeine you get in a day from brewed coffee, decaf coffee, black tea, green tea, caffeinated soft drinks and energy drinks, plus any amount you read on a label (for example a coffee-shop drink, pre-workout powder or caffeine pill), in milligrams (mg) and US fluid ounces. The amounts come from the FDA consumer page: per 12 fl oz, soft drinks 23–83 mg, green tea 37 mg, black tea 71 mg, regular brewed coffee 113–247 mg and energy drinks 41–246 mg; decaf coffee 2–15 mg per 8 fl oz. Other sizes are scaled by fluid ounces, and the range is rounded outward to whole mg. For most adults the FDA cites 400 mg a day as an amount not generally associated with negative effects (about two to three 12 fl oz cups of coffee). Not included: espresso and specialty coffee-shop drinks, chocolate, foods, gum and medicines unless you type their label amount; how fast your body clears caffeine (the FDA says this varies widely); and any limit for pregnancy, breastfeeding, children or teens, for which the FDA gives no number (talk to your health care provider). Not medical advice. Everything stays in this browser tab; nothing is sent or saved. Independent ToolsKo estimate. Sources reviewed November 12, 2026.

How to use it (step by step)

  1. 1Pick who the caffeine is for. For most adults the tool compares with the FDA’s 400 mg a day; you can type your own limit, for example one your doctor gave you.
  2. 2For each drink, pick the type, its size in fluid ounces (a can of soda is 12, a large energy drink is often 16) and how many you have in a day. Pick “None” for rows you do not need.
  3. 3If you also have caffeine from a label, such as a coffee-shop drink, a pre-workout powder or a pill, type the milligrams. Read your total range and whether it is under or over the limit.

Words to know

Milligram (mg)
A tiny unit of weight: 1,000 mg make 1 gram. Caffeine amounts on labels and in FDA advice are given in mg.
Fluid ounce (fl oz)
The US unit for drink size. A standard soda can is 12 fl oz; a measuring cup is 8 fl oz.
Decaf
Coffee or tea with most of the caffeine removed. It still has a little: the FDA says decaf coffee usually has 2–15 mg per 8 fl oz cup.
Energy drink
A drink sold for an energy boost, usually with added caffeine. Amounts vary a lot by brand, so the label is the best guide.

Explore tools for Australia, the US & Europe →

Sources & methods

References checked November 11, 2026. Read each tool’s scope and assumptions before relying on its result.

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