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Caffeine in Tea and Coffee: Estimate Milligrams per Cup
Medical note: This article discusses foods and researched botanicals. It does not claim to prevent, treat, or cure disease. Supplements are not a substitute for food, and studied amounts are not personal prescriptions.
A cup is not a standard unit. An 8 fl oz mug of brewed coffee is often listed near 95 mg of caffeine, a single espresso shot near 63 mg, black tea near 47 mg, and an ordinary green tea near 28 mg. Matcha, which uses the whole leaf, usually lands higher than a tea bag. This page multiplies those averages by the number of servings you enter.
Use it when you want to see whether an afternoon green tea is a small addition or whether a third coffee pushes the day past the 400 mg figure the U.S. FDA cites for healthy adults. That 400 mg line is context, not a target and not a prescription. Sensitivity, pregnancy, anxiety, and some medicines are reasons the useful amount is lower.
Herbal infusions such as chamomile sit at zero because they are not made from the tea plant. A blend that hides black tea inside a “relaxing” tin is a different drink. Decaf coffee still contains a little caffeine; this list does not try to model every decaf process.
How the number is made
Each drink uses a commonly published average for a standard serving: about 95 mg in 8 fl oz of brewed coffee, 63 mg in a 1 fl oz espresso shot, 47 mg in black tea, and 28 mg in green tea. Your total is servings multiplied by that average. The 400 mg line is the amount the U.S. FDA cites for healthy adults, not a personal prescription.
What this does not do
Brew strength, leaf grade, and cup size move the number a lot. This does not account for sensitivity, pregnancy, heart conditions, or medicines. Decaf is not zero.
Read the guide behind it
Questions people ask
How much caffeine is in a cup of green tea?
A typical 8 fl oz cup of brewed green tea is often listed around 28 mg. Matcha, which uses the whole leaf, is usually higher. The calculator uses those averages so you can compare cups, not so you can label a specific brand.
Is 400 mg of caffeine a limit for everyone?
No. The FDA cites 400 mg a day as an amount not generally associated with dangerous effects for healthy adults. Pregnancy, anxiety, sleep problems, and some medicines call for a lower amount. Ask a clinician before you treat 400 mg as your target.
Why does herbal tea show zero?
Chamomile, peppermint, and similar infusions are not made from Camellia sinensis, so they are not a meaningful caffeine source. A blend that includes black or green tea is different.
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