Caffeine Estimator
How much caffeine is in your cup depends on the beans, how much you use, and how you brew. Enter your setup to see an estimated range in milligrams.
About your coffee
Weight of the dry grounds, before brewing.
How many cups you drink.
Arabica · Pour-over · 1 serving
115–215 mg caffeine
An estimated range, not a measurement.
- Per serving
- 115–215 mg
- Caffeine in the beans
- 1–1.5% of weight
What moves this number
Bean species
Robusta has roughly 1.5 to 2 times the caffeine of arabica, so it moves the estimate more than anything else.
Dose
The estimate scales with the weight of ground coffee, not the size of the cup. A small espresso with 18 g can hold more than a large filter coffee with 12 g.
Brew method
Longer contact and hotter water pull out more caffeine. Short or cold brews pull out somewhat less.
Roast level
Little effect by weight. Dark beans are less dense, so a scoop of dark roast weighs less than a scoop of light roast.
Variety and growing conditions
Even within a species the caffeine content varies by variety, origin, and harvest, which is why we show a range.
This is a general estimate for information only. It is not medical advice and does not say how much caffeine is right for you. If you have a health condition, are pregnant, or take medication, ask a doctor or pharmacist.
Species matters most
Robusta beans carry roughly 1.5 to 2 times the caffeine of arabica. If a blend does not say, the estimator covers both.
Dose beats cup size
Caffeine comes from the grams of coffee you brew with, not the volume you drink. Weigh your dose for the best estimate.
Always a range
Variety, origin, grind, and brew details all shift the real number, so a single figure would be false precision.
How the estimate works
We multiply three things: the grams of coffee, the share of the bean that is caffeine, and the share of that caffeine that ends up in the cup. The last two are ranges, so the low end of the result uses the low value of both and the high end uses the high value of both. Results are rounded to the nearest 5 mg.
| Species | % of bean weight |
|---|---|
| Arabica | 1–1.5% |
| Robusta | 1.7–2.7% |
| Blend / not sure | 1–2.7% |
| Method | Extracted |
|---|---|
| Espresso | 65–90% |
| Pour-over | 75–95% |
| AeroPress | 75–95% |
| French press | 80–95% |
| Moka pot | 70–90% |
| Cold brew | 60–90% |
| Tubruk / Turkish | 80–95% |
- The bean percentages are commonly quoted approximate ranges by dry weight, not a single measurement. In one study of 38 commercial roasted and ground coffees, caffeine ranged from 1.00 to 2.02 g per 100 g, inside the ranges above.
- The extraction shares are BeanHub's editorial estimates. Caffeine dissolves readily in water, so most of it reaches the cup; short espresso contact and cold water are assumed to extract somewhat less.
- Roast level is not an input: caffeine is stable under roasting heat, so by weight the effect is small.
- The estimate does not cover decaf, instant coffee, or the water, milk, and ice added to the cup.
Not medical advice
This tool estimates how much caffeine is in coffee. It does not tell you how much is right for you and does not make health claims. For context only, the European Food Safety Authority (EFSA) published an opinion in 2015 on caffeine in the diet, which it summarises as: for healthy adults, single doses of up to 200 mg and intakes of up to 400 mg per day from all sources do not raise safety concerns, with a separate, lower daily figure for pregnant and breastfeeding women. If you have a health condition, are pregnant, or take medication, ask a doctor or pharmacist.
Sources
- de Souza et al. (2010), Teores de compostos bioativos em cafés torrados e moídos comerciais, Química Nova 33(4).
- EFSA Panel on Dietetic Products, Nutrition and Allergies (2015), Scientific Opinion on the safety of caffeine, EFSA Journal 2015;13(5):4102. Summary used here: EUFIC, EFSA opinion on the safety of caffeine.
Weighing your dose?
The Ratio Calculator turns coffee grams into water and back, so you can size a brew exactly.