Coffee Caffeine Calculator

Estimate the caffeine in your coffee from brew method, cup size, cups per day and bean type — then compare it against the reference point that actually applies to you. Every figure in this tool is traced to a named source below, and the ones that are our own estimates say so.

1 oz24 oz

Cups Per Day

Bean Type

“Typical / unspecified” is the figure as measured in commercial coffee, which already contains some robusta. Robusta multiplies it by 1.5x and Blend by 1.15x — our interpolation on sourced dry-weight ranges, not a per-method measurement.

Per Serving

95 mg

Daily Total

190 mg

Compare Against

The FDA has cited 400 mg a day for most healthy adults as an amount not generally associated with negative effects, while noting wide variation in how sensitive people are to caffeine and how fast they clear it.

% of the FDA reference point for most adults (400 mg/day)48%

This is an estimate for general information, not medical advice. Caffeine per cup is driven more by how much ground coffee you use than by brew method, and this calculator does not ask for your dose — treat the number as carrying a spread of roughly ±40%. If you are pregnant, breastfeeding, taking medication or managing a heart condition, follow your clinician’s guidance rather than this page.

Nothing to change — but here is what we drink

At 190 mg/day you are comfortably under the 400 mg/day reference point you selected, so you don’t need to change anything. These are just the everyday beans we keep buying.

Everyday house coffee

Koffee Kult Medium Roast Coffee Beans

A straightforward medium roast for the cup you are already drinking.

Check price on Amazon →Read our medium roast guide

Arabica + robusta blend

Lavazza Super Crema Whole Bean Coffee Blend

An Italian arabica-and-robusta blend — if this is what you buy, the Blend setting above is the right one to pick.

Check price on Amazon →Read our medium roast guide

Go deeper

As an Amazon Associate we earn from qualifying purchases. Links above are affiliate links; recommendations come from gear we have written about on this site.

How this is calculated

These numbers are estimates, not measurements of your specific coffee. Read the assumptions below before you trust a figure to the milligram.

The formula

Caffeine per serving = the caffeine figure for your brew method, multiplied by the bean-type multiplier. For drip, pour over, French press, AeroPress, instant and cold brew the figure is per 8 fl oz and scales linearly with your cup size (figure ÷ 8 × your ounces). For espresso and the moka pot the figure is a fixed serving and the cup-size control does not apply. Daily total = caffeine per serving × cups per day, rounded once at the end. The percentage is that daily total divided by the reference point you selected.

Step by step

  1. Look up the caffeine figure for the brew method you picked (per 8 fl oz, or per fixed serving for espresso and moka pot).
  2. Multiply by the bean-type multiplier: Typical / unspecified 1x, Blend 1.15x, Robusta 1.5x.
  3. For per-8-fl-oz methods, scale to your cup size by dividing by 8 and multiplying by your ounces. Fixed servings skip this step.
  4. Multiply by cups per day to get the daily total. Rounding happens only here, so a per-cup rounding error cannot be multiplied up.
  5. Divide the daily total by the reference point you selected (400 mg adults, 200 mg pregnancy, 100 mg ages 12–18) to get the percentage and the warning band.

Assumptions and limits

  • Three figures are anchored to analytical measurements in USDA FoodData Central: brewed coffee 95 mg per 8 fl oz (fdcId 171890, 40 mg/100 g × 237 g = 94.8), a single 1 fl oz espresso 63 mg (fdcId 171891, 212 mg/100 g × 29.6 g = 62.8), and instant coffee 62 mg per 8 fl oz (fdcId 174130, 26 mg/100 g × 238.4 g = 62.0). The 2 fl oz double espresso is twice the measured single, 126 mg.
  • Drip, pour over, French press and AeroPress all share the one USDA brewed-coffee figure of 95 mg per 8 fl oz. No public-health or food-composition authority publishes a per-method, per-8-fl-oz caffeine figure for these, and the only peer-reviewed head-to-head we could find (Angeloni et al., Food Research International, 2019) contradicted the per-method ranking this tool used to assert — it measured French press as the LEAST efficient extractor per gram of coffee, not the second most. Rather than publish an ordering no source supports, we give the four methods the same number.
  • The moka pot is a fixed 1.4 fl oz (40 mL) serving at 51 mg, from Angeloni et al. 2019, which measured 51.14 mg in a 40 mL moka serving. A moka cup is not 8 fl oz, so treating it as one described a whole multi-cup pot.
  • Cold brew is the one method genuinely distinct enough to carry its own figure. We use 200 mg per 8 fl oz with an explicit plausible range of 115–426 mg, from the Olechno et al. 2021 Foods review (48.50–179.95 mg/100 mL). Angeloni et al. 2019 independently measured cold brew at 1.25 mg/mL — 296 mg per 8 fl oz, and the highest caffeine per cup of the eight methods tested.
  • The bean-type control is an interpolation, not a measurement. The base column is labelled “Typical / unspecified” rather than “Arabica” because the USDA figures are market-average measurements of commercial coffee that already contain some robusta — calling them arabica and then applying a species premium would count robusta twice. Olechno et al. 2021 gives green-bean caffeine as arabica 0.9–1.5% and robusta 1.2–2.4% of dry weight; the midpoints, 1.2% and 1.8%, give the Robusta multiplier of 1.5x. The Blend multiplier assumes roughly 30% robusta: 1 + (0.30 × 0.5) = 1.15x. The overstatement is largest on instant coffee, which is heavily robusta-based in the real market, so its 62 mg baseline already embeds robusta.
  • Dose matters more than method. Angeloni et al. 2019 concluded that “one of the most important factors is the ratio of ground coffee to the final volume of the drink,” and that it is not possible to say how many cups can be drunk without exceeding a given dose because the content varies so much with brewing method. This calculator does not ask how much ground coffee you use, so it assumes a typical US home strength. Treat every output as a rough estimate carrying a plausible spread of roughly ±40%, not a measurement of your cup.
  • The 400 mg/day figure is not a limit. The FDA has cited 400 mg a day for most healthy adults as an amount not generally associated with negative effects, while noting wide variation in both caffeine sensitivity and clearance. Different reference points apply to other groups: ACOG Committee Opinion No. 462 frames moderate intake in pregnancy as under 200 mg/day, and 100 mg/day is the figure commonly cited in paediatric guidance for ages 12–18 — neither is an FDA number, and on pregnancy the FDA says only to talk to your health care provider. The FDA separately estimates that toxic effects such as seizures can be observed with rapid consumption of around 1,200 mg of caffeine; that describes a large dose taken quickly, not a daily total.
  • This tool is for general information and is not medical advice.

Sources

  1. FDA - Spilling the Beans: How Much Caffeine is Too Much
  2. USDA FoodData Central - Coffee, brewed, prepared with tap water (fdcId 171890)
  3. USDA FoodData Central - Coffee, brewed, espresso, restaurant-prepared (fdcId 171891)
  4. USDA FoodData Central - Coffee, instant, regular, prepared with water (fdcId 174130)
  5. Angeloni et al. 2019, Food Research International 116:1327-1335 - What kind of coffee do you drink? An investigation on effects of eight different extraction methods
  6. Olechno, Puscion-Jakubik, Zujko & Socha 2021, Foods 10(6):1208 - Influence of Various Factors on Caffeine Content in Coffee Brews
  7. ACOG Committee Opinion No. 462 - Moderate caffeine consumption during pregnancy
  8. Mayo Clinic - Caffeine content for coffee, tea, soda and more

Last reviewed October 2026.

How Much Caffeine Is in Your Coffee?

Caffeine content in coffee is one of the most misunderstood topics in everyday nutrition. Most people assume espresso is the highest-caffeine drink because it is the most intense — but a single 1 fl oz espresso shot measures around 63 mg in USDA FoodData Central, while a 12 fl oz drip coffee works out at roughly 143 mg on the same basis. Concentration and volume are two very different things.

Those are measurements of commercial coffee, not of your cup. Published espresso concentrations span roughly 2.4–4.5 mg per millilitre, and one peer-reviewed study measured a 7 g / 30 mL espresso at 122 mg — nearly double the USDA figure. The honest summary is that caffeine per cup depends mostly on how much ground coffee you used per unit of water, and only secondarily on which device you used.

Why Four Brew Methods Share One Number

In the calculator above, drip, pour over, French press and AeroPress all return the same caffeine figure: 95 mg per 8 fl oz. That is deliberate, and it is the most defensible thing on this page.

No public-health body and no food-composition database publishes a per-method, per-8-fl-oz caffeine figure for pour over, French press or AeroPress. USDA FoodData Central publishes one number for “coffee, brewed, prepared with tap water.” Everything beyond that, anywhere on the internet, is somebody’s estimate.

We used to publish a ranking: French press highest, then moka, then cold brew, then drip, then pour over, then AeroPress. The only peer-reviewed head-to-head measurement we could find — Angeloni and colleagues, who ran eight extraction methods at controlled doses with HPLC analysis — ordered them almost the opposite way, and measured French press as the least efficient extractor per gram of coffee of the eight. Our ranking was not merely uncited. It was contradicted.

So we removed it. At a fixed dose and ratio, the brew method is a second-order driver, and publishing six different numbers implied a precision that no source supports. Espresso keeps its own figure because USDA measured it separately, the moka pot keeps its own because it is served at 1.4 fl oz rather than 8, and cold brew keeps its own because it is genuinely, measurably higher. The rest share the one number that is actually sourced.

Caffeine by Brew Method

Here is what each setting in the calculator is based on, and where the number comes from.

Drip Coffee (95 mg per 8 fl oz)

The baseline, and the best-sourced figure in the tool: USDA FoodData Central records 40 mg of caffeine per 100 g of brewed coffee, and an 8 fl oz cup at 237 g gives 94.8 mg. Mayo Clinic publishes 96 mg for the same serving. Most home mugs are 12–16 fl oz, so a “cup” of morning drip often delivers 143–190 mg on this basis. Note that the FDA frames 400 mg as “about two to three 12-fluid-ounce cups of coffee,” which implies roughly 130–200 mg per 12 fl oz cup — our 143 mg sits at the low end of the agency’s own framing, which is a reminder that this is a market average, not a ceiling.

Pour Over (95 mg per 8 fl oz — shared baseline)

Shares the USDA brewed-coffee figure. Pour over at an SCA-style 1:16 ratio was measured at 0.74 mg/mL in the Angeloni study, which would be about 175 mg per 8 fl oz — but that was a deliberately strong, controlled brew, not a typical home cup. Rather than pick a number between the two, we use the one that is sourced and tell you that a strong pour over can run well above it.

French Press (95 mg per 8 fl oz — shared baseline)

Also shares the brewed-coffee figure. The widely repeated claim — including in an earlier version of this page — is that the four-minute immersion and the absence of a paper filter make French press an unusually efficient caffeine extractor. The controlled measurement says otherwise: of eight methods tested at matched doses, French press extracted the least caffeine per gram of coffee. The mechanism story was plausible and wrong, so we deleted it.

AeroPress (95 mg per 8 fl oz — shared baseline)

Shares the brewed-coffee figure. In the controlled study AeroPress sat at the top of the filter group by concentration, which is the reverse of the lowest-of-all-hot-methods position our old table gave it. A short, strong AeroPress recipe will exceed 95 mg per 8 fl oz; a long, diluted one will not. The dose you use decides it.

Espresso, Single and Double (63 mg and 126 mg)

USDA measures restaurant-prepared espresso at 212 mg per 100 g, which gives 62.8 mg in a 1 fl oz shot. Mayo Clinic agrees at 64 mg. Espresso is far more concentrated than drip — more milligrams per ounce — but shots are consumed in tiny volumes, so the absolute caffeine per serving is lower than most people expect.

The double shot is the default in most specialty cafe drinks, so the calculator now offers it as its own method at 126 mg. That is comparable to a 10–11 fl oz drip coffee. The lattes, cappuccinos and flat whites that taste mild because of all that milk are often carrying as much caffeine as a full mug of drip. Three doubles a day is 378 mg — within sight of the 400 mg adult reference point before you count anything else.

Moka Pot (51 mg per 1.4 fl oz cup)

The moka pot is the one method where the serving size was doing the real damage. A moka cup is about 40 mL, not 8 fl oz, and the Angeloni study measured 51.14 mg of caffeine in exactly that serving. The calculator now treats it as a fixed 1.4 fl oz serving, so asking for “8 ounces of moka” no longer silently describes a whole multi-cup pot. Per millilitre the moka brew is strong — around 1.28 mg/mL, comparable to cold brew — but you drink very little of it at a time.

Instant Coffee (62 mg per 8 fl oz)

The lowest figure in the tool and one of the three strongest anchors: USDA records 26 mg per 100 g for instant coffee prepared with water, giving 62 mg in an 8 fl oz cup. One caveat worth knowing: commercial instant coffee is heavily robusta-based, so that 62 mg already includes the robusta effect. If you select Robusta for instant, the calculator is layering a species premium on a figure that already has one — the number it gives you is the most likely to be an overestimate of anything in the tool.

Cold Brew (200 mg per 8 fl oz, plausibly 115–426 mg)

Cold brew is brewed as a concentrate with a very high coffee-to-water ratio — typically 1:5 to 1:8 — and then diluted. A 2021 review in Foods put cold brew at 48.50–179.95 mg per 100 mL, which is 115–426 mg per 8 fl oz. The Angeloni study measured it at 1.25 mg/mL, or 296 mg per 8 fl oz, and found the highest caffeine per cup of all eight methods it tested. We use 200 mg as the point estimate and show the full range next to it, because a 3.7x spread is the honest answer here. Some commercial nitro cold brew cans exceed 250 mg.

This matters because an earlier version of this page told readers to switch away from cold brew as “the highest-caffeine common coffee format” while the calculator ranked it below French press, so the advice contradicted the tool. The prose was right and the table was wrong. Both now say the same thing.

What the FDA Actually Says — and What It Doesn’t

The U.S. Food and Drug Administration has cited 400 mg a day for most adults as an amount not generally associated with negative effects— that is the agency’s own wording, and it is the only wording this page should use. The FDA does not call 400 mg a limit, does not “recommend” it, and has not declared it generally recognised as safe, which is an unrelated regulatory term for food additives. An earlier version of this page used all three framings. They were wrong.

The FDA immediately qualifies the figure: there is wide variation in both how sensitive people are to caffeine and how fast they clear it from the body. Genetics — particularly CYP1A2 enzyme variants — body weight, medication and habitual intake all shift it. 400 mg is a reference point for a population, not a verdict on your morning.

The agency does publish a figure for acute toxicity, and the qualifier on it is load-bearing: toxic effects such as seizures can be observed with rapid consumption of around 1,200 mg of caffeine — less than half a teaspoon of pure powdered caffeine. That is a dose taken quickly, typically from supplements or powders, not a daily total accumulated across cups of coffee. The calculator surfaces that number above 1,000 mg/day with the qualifier attached.

Reference Points for Pregnancy, Teens and Medical Conditions

The 400 mg figure applies to most healthy adults. Other groups are usually discussed against lower numbers, and — importantly — those numbers do not come from the FDA.

  • Pregnancy — under 200 mg/day.This figure is from the American College of Obstetricians and Gynecologists, Committee Opinion No. 462, “Moderate Caffeine Consumption During Pregnancy.” The FDA publishes no pregnancy figure of its own and says to talk to your health care provider. Two 12 fl oz drip coffees come to about 285 mg — comfortably under the adult reference point, and over 40% above the ACOG one. That is why the calculator makes you choose which number you are being measured against.
  • Ages 12–18 — around 100 mg/day. This is the ceiling commonly cited in paediatric guidance for adolescents, not an FDA figure. Younger children are generally advised to avoid caffeine.
  • People managing specific conditions.Anxiety disorders, heart arrhythmias, acid reflux and insomnia can all be worsened by caffeine, and some medications interact with it. There is no single number here — follow your clinician’s guidance rather than a calculator.

Symptoms of excessive caffeine include rapid heartbeat, anxiety, jitteriness, insomnia and digestive discomfort.

Typical, Blend and Robusta: The Species Setting

Coffee is grown from two primary species: Coffea arabica and Coffea canephora (robusta). They differ in caffeine content, though by less than the internet usually claims.

The 2021 Foodsreview puts green arabica beans at 0.9–1.5% caffeine by dry weight and green robusta beans at 1.2–2.4%. The ranges overlap, and the midpoints — 1.2% versus 1.8% — work out to robusta carrying about 1.5 times the caffeine of arabica, not the “roughly twice as much” figure this page used to state. Caffeine functions as a natural pesticide in the plant, and robusta grows at lower altitudes where pest pressure is higher, which is the usual explanation for the difference.

That is why the calculator’s base column is labelled “Typical / unspecified” rather than “Arabica.” The USDA measurements behind it are analytical values for commercial market-average coffee, which already contains robusta. Labelling that figure arabica and then multiplying it by a robusta premium counts the species twice. Selecting Robusta multiplies the base by 1.5x and Blend by 1.15x — the latter assuming roughly 30% robusta, in line with the 10–30% that traditional Italian espresso blends use for crema and body.

Most specialty coffee is 100% arabica. Grocery-store blends and most instant coffee incorporate robusta to reduce cost. Vietnamese coffee, a style known for intensity, is typically pure robusta.

Does Dark Roast Have More Caffeine?

This is one of the most persistent coffee myths. Dark roast does not have significantly more caffeine than light roast.

Caffeine is relatively heat-stable and survives roasting largely intact. What roasting destroys is bean mass — the longer the roast, the more water and carbon dioxide escape, so dark-roasted beans are physically lighter per bean.

If you measure coffee by weight, dark and light roast give nearly identical caffeine per cup. If you measure by volume, dark-roast beans pack less densely, so a scoop contains fewer grams — and slightly less caffeine. By either measure the difference is small and well within normal variation. The perception that dark roast is “stronger” comes from flavour intensity, not caffeine.

How to Reduce Your Caffeine Intake

If you want to cut caffeine without giving up coffee, these are the levers that actually move the number, roughly in order of effect.

  • Use less ground coffee. Dose is the single biggest driver of caffeine per cup — bigger than brew method. Dropping from 20 g to 15 g per cup cuts roughly a quarter of the caffeine, and you can split the difference by brewing weaker rather than drinking less.
  • Swap a cup for decaf. At two 8 fl oz drip coffees a day, swapping one takes the estimate from about 190 mg to about 95 mg. Nothing else in this list is close. Decaf is not caffeine-free, but the residual is small.
  • Blend with decaf, or go half-caff. A 50/50 blend of regular and decaf roughly halves the caffeine while keeping the flavour and the ritual, and most cafes will pull a half-caff shot on request.
  • Reduce serving size. A 12 fl oz mug instead of a 16 fl oz tumbler cuts caffeine by 25% instantly.
  • Dilute cold brew properly. Cold brew really is the highest-caffeine common coffee format, at a point estimate of 200 mg per 8 fl oz against 95 mg for drip, with a plausible range reaching 426 mg. If you drink it as a concentrate or barely diluted, that is likely the largest single source of caffeine in your day.
  • Switch away from robusta-heavy blends.On the sourced dry-weight midpoints, moving from robusta to a typical commercial coffee cuts caffeine by about a third, and moving from a ~30% robusta blend cuts it by about 13%. Real, but smaller than the “30–40%” this page used to claim for the blend case.
  • Stop the clock earlier. Caffeine has a half-life of about 5–6 hours, so a 3 pm cup still has half its caffeine in your system at 8–9 pm. Cutting off caffeine by early afternoon improves sleep quality even if your total does not change.

Frequently Asked Questions

How accurate is this calculator?

It is an estimate with a plausible spread of roughly ±40%, and it is deliberately built to be no more precise than its sources allow. Three figures — brewed coffee, espresso and instant — are analytical measurements from USDA FoodData Central. The moka pot figure and the cold brew range come from peer-reviewed measurements. The bean-type multipliers are our own interpolation on sourced dry-weight ranges, and we say so on the page. The calculator does not ask how much ground coffee you use, which is the largest single driver of caffeine per cup, so no output should be read to the milligram.

Does dark roast have more caffeine?

No, not meaningfully. Dark and light roast contain nearly identical caffeine by weight. Dark-roast beans are lighter per bean after moisture loss, so measuring by volume gives you slightly fewer grams per scoop and slightly less caffeine. The difference is small. Flavour intensity and bitterness create the impression of more caffeine; the actual amount is nearly the same.

How long does caffeine stay in your system?

Caffeine has a half-life of approximately 5–6 hours in healthy adults, meaning your body eliminates half of it in that time. A 200 mg cup at 2 pm still has about 100 mg active at 7–8 pm and 50 mg at midnight. This is why late-afternoon coffee disrupts sleep even when you do not feel wired. Genetics matter: fast metabolisers clear caffeine in 3–4 hours, while slow metabolisers can take 8–10.

Why do drip, pour over, French press and AeroPress all show the same number?

Because that is what the evidence supports. No authority publishes per-method caffeine figures for those four, and the one controlled head-to-head study we found ordered them almost the opposite way to the ranking we used to publish — including measuring French press as the least efficient extractor of the eight methods tested. Giving all four the single sourced brewed-coffee figure is less flattering to the tool and more honest about what is known. At a fixed dose, your brew method is a second-order driver anyway.

Is 400 mg a day safe?

“Safe” is not the framing the FDA uses, and this page should not put words in its mouth. The FDA has cited 400 mg a day for most healthy adults as an amount not generally associated with negative effects, while stressing that sensitivity and clearance vary widely between people. It is a population reference point. Pregnancy is usually discussed against the ACOG figure of under 200 mg/day, and adolescents against about 100 mg/day. If you have a heart condition, an anxiety disorder, are pregnant or breastfeeding, or take medication that interacts with caffeine, your clinician’s guidance beats any calculator.

Does decaf have no caffeine at all?

No — decaf has a small amount of residual caffeine, which is why the recommendations above say “before decaf’s own small residual caffeine” rather than treating a swapped cup as zero. It is low enough that swapping one or two cups is by far the most effective lever on this list, but it is not nothing.