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The short answer: a typical cup of coffee uses about 100 to 140 coffee beans. One roasted bean weighs roughly 0.12 to 0.14g, so the 15 to 18g you use for a mug of filter coffee or a double espresso works out at around 110 to 140 beans. A single espresso takes about 50 to 70, and because bean size and roast change the count, baristas weigh coffee instead of counting it.
Counting beans is a fun way to picture what goes into your mug. It is also handy when you want to know how far a bag will stretch. This guide gives the numbers for each brew method, explains why they vary and shows the easy way to get your dose right every morning.
How much does one coffee bean weigh?
A single roasted arabica bean usually weighs around 0.12 to 0.14g. That means one gram of whole beans holds roughly 7 to 8 beans. Coffee beans are the roasted seeds of the coffee cherry, so like any crop they are not all the same size.
Roasting changes the weight too. Beans lose moisture in the roaster and usually come out around 15 to 20% lighter than the green coffee that went in, even though they swell in size. So a roasted bean is bigger than the raw seed, but lighter.
How many coffee beans per cup for each brew method?
The dose depends on how you brew. The table below uses common home recipes and an average of about 7.5 beans per gram, so treat the counts as rough guides rather than exact figures.
| Brew | Typical dose | Approximate beans |
|---|---|---|
| Single espresso | 7 to 9g | 50 to 70 |
| Double espresso | About 18g | About 135 |
| Mug of pour over or filter (250ml) | 15 to 16g | 110 to 120 |
| AeroPress | About 15g | About 110 |
| Cafetière (500ml, two mugs) | 30 to 33g | 225 to 250 |
For filter coffee, the Specialty Coffee Association’s Golden Cup guideline suggests about 55g of coffee per litre of water. Scale that down to a 250ml mug and you get roughly 14g, which is a little over 100 beans. Many home brewers go slightly stronger at 15 to 16g, so the coffee beans per cup for a mug of filter land at about 110 to 120.
A cafetière uses more coffee because you usually brew two mugs at once. A ratio of about 1:15 to 1:16 means 30 to 33g for 500ml of water, or roughly 225 to 250 beans. Our French press coffee ratio guide covers stronger and milder options in more detail.
Why do coffee beans per cup vary from bag to bag?
Two bags can give quite different counts for the same dose. Three things cause most of the difference.
Bean size and variety
Some coffee varieties grow large seeds, while others grow small ones. Peaberries, where the cherry holds one round seed instead of two flat ones, also tend to be small. Smaller beans simply mean more of them in every gram.
Roast level
Darker roasts stay in the roaster for longer, so they lose more moisture and mass. As a result, a gram of dark roast can hold a few more beans than a gram of light roast. Our guide to coffee roast levels explains how roasting changes the bean.
Your own recipe
Strength is personal. If you like a stronger mug, you might use 18g instead of 15g, and that adds around 20 beans. The best dose is the one you enjoy, so adjust a gram at a time.
Should you count coffee beans or weigh them?
Weigh them. Counting 120 beans every morning would take ages, and it still would not allow for bean size. A digital scale gives you the same dose every time, so each cup tastes like the last one.
A coffee scale also lets you weigh your water, which matters just as much as the coffee. Our roundup of the best coffee scales in the UK compares the main options. The Timemore Black Mirror Basic 2 is a popular choice, and its listing includes a built-in timer and a flow rate display for pour over.
Check Timemore Black Mirror Basic 2 prices on Amazon UK
No scale yet? A coffee scoop is a workable stopgap, but whole beans pack loosely and vary in size. Your dose will drift more from day to day, so a scale is worth it if you brew daily.
How many cups of coffee are in a bag of beans?
This is where the bean count gets useful. A standard 250g bag holds roughly 1,900 beans. At 16g per mug that is about 15 cups, and at 18g per double espresso it is about 13 or 14 shots. A 1kg bag holds around 7,500 beans, which is roughly 55 to 60 cups.
Grind size does not change the number of beans, but it does change how the coffee tastes. Match the grind to your method with our coffee grind size chart, and grind just before brewing if you can.
For everyday brewing at home, we mostly drink 200 Degrees Brazilian Love Affair. 200 Degrees describes it as its signature espresso blend: medium roasted, with plenty of body, great crema and a strong, bold finish. You can buy it as whole beans or ground for cafetière, filter or espresso, in 250g and 1kg bags.
Check Brazilian Love Affair at 200 Degrees
FAQ
How many coffee beans are in a shot of espresso?
A single shot of 7 to 9g uses about 50 to 70 beans. A double shot of around 18g uses about 135, and many home baristas brew doubles as standard.
How many grams of coffee should I use per cup?
For filter, pour over or AeroPress, 15 to 16g per 250ml mug is a sensible start. Then adjust by a gram or two until it tastes right to you.
Do dark roast beans weigh less?
Yes, each bean weighs a little less. Darker roasts lose more moisture, but they also swell, so they can look bigger in the bag even though they are lighter.
Is it better to buy whole beans or ground coffee?
Whole beans stay fresher for longer, because grinding exposes far more surface to air. Our guide to the 15-15-15 coffee rule explains how quickly each form goes stale.
The bottom line
Most cups of coffee use about 100 to 140 beans, because one roasted bean weighs roughly 0.12 to 0.14g and most mugs and double espressos take 15 to 18g. A single espresso needs about 50 to 70. Bean size and roast shift the count a little, so the reliable way to get the same cup every day is to weigh your coffee beans per cup rather than count them.
