The short answer, and then the arithmetic so you can check it. A pound of coffee is 454 grams — that is NIST’s own kitchen equivalent for 1 pound (16 ounces). Divide that by the dose for the drink you actually make and you get:
- Roughly 33 to 40 six-ounce cups at filter strength — which is where the “about 40 cups” figure on bags comes from.
- Roughly 17 to 21 large mugs if you drink 12 oz at a time, which most people do.
- Roughly 25 double espressos at an 18 g dose.
So when a bag says “makes 40 cups” and your pound lasts eleven days, nothing is wrong. The bag is counting six-ounce cups and you are drinking twelve-ounce mugs, twice a day. That one conversion explains almost every complaint about coffee not going as far as expected.
The arithmetic, by method
Everything below is weight divided by weight, using published ratios: the National Coffee Association’s 1:13 to 1:16 for pour-over, 1:10 to 1:16 for French press and 1:4 to 1:5 for cold brew, and Breville’s published 18 g ideal dose for a 54 mm espresso basket. Water weight comes from the USGS figure that water is roughly 1 gram per milliliter, and the cup sizes from NIST’s equivalents — 180 mL is 6 fluid ounces, 240 mL is a cup.
| What you are making | Coffee per serving | From one pound (454 g) |
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| 6 oz cup, filter strength | About 11–14 g at the NCA's 1:13–1:16 ratio | Roughly 33–40 cups |
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| 12 oz mug, filter strength | About 21–26 g at the same ratio | Roughly 17–21 mugs |
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| French press, 12 oz serving | About 21–34 g at the NCA's 1:10–1:16 ratio | Roughly 13–21 servings |
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| Double espresso | 18 g — Breville's published ideal dose for a 54 mm basket | Roughly 25 doubles |
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| Cold brew concentrate | At the NCA's 1:4–1:5, a pound makes about 60–75 fl oz of concentrate | Many drinks once diluted — see the note below |
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Two notes on the table. Cold brew looks alarming and is not. At the NCA’s 1:4 to 1:5 ratio, cold brew leaves the vessel as a concentrate that is meant to be diluted — so a pound producing 60 to 75 fl oz of concentrate turns into several times that in finished drinks. It is still the most coffee-hungry method per glass, which is worth knowing if you are buying for a daily cold brew drinker; cold brew vs iced coffee explains the concentrate properly.
And drip machines are not in the table on purpose. The NCA’s drip guidance is deliberately volumetric — its “Golden Ratio” is one to two tablespoons of ground coffee per 6 oz of water — and a tablespoon of ground coffee does not have a fixed weight. NIST puts a tablespoon at about 15 mL, but how many grams of coffee fill 15 mL depends on the grind and how hard it was tapped down, which is the whole argument in do you need a coffee scale. A drip machine uses the same medium grind and a similar strength to pour-over, so the filter rows are the right ballpark — we are not going to invent a grams-per-tablespoon figure to make the table look tidier.
Why your pound runs out faster than the bag says
Three reasons, in order of how much they matter.
Your mug is twice the size of a “cup”. The coffee industry’s cup is 6 fl oz — the same unit your drip machine’s carafe markings use, which is why a “12-cup” machine does not make twelve mugs. A standard mug is 10 to 12 oz and plenty are bigger.
You brew stronger than the minimum. The difference between the weak and strong ends of the NCA’s own pour-over band, 1:16 against 1:13, is about 20% more coffee per cup. Nothing wrong with that — it is a taste preference — but it is a fifth of the bag.
Some of it never reaches a cup. Grinder retention, a dose spilled on the counter, the shot you threw away while dialing in. On espresso especially, the gap between coffee bought and coffee drunk is real.
The more useful question: how long will a pound stay good?
This is where the arithmetic gets genuinely practical, because a pound frequently outlasts its own freshness.
The NCA puts roasted whole beans at roughly one to three weeks at room temperature and ground coffee at one to two weeks, with air, moisture, heat and light as coffee’s four greatest enemies. Now put that against the table: a pound is around 35 small cups or 20 mugs. One person drinking two mugs a day gets through a pound in ten days — fine. One person drinking one mug a day takes three weeks, and the last few mugs are past their best. Someone who drinks coffee only at weekends is looking at two months, and most of that bag will taste flat.
Three honest responses to that, depending on who is drinking it:
- Buy the smaller bag. For one light drinker, a 10 to 12 oz bag bought more often beats a pound bought rarely. It is also why most specialty roasters sell 10 and 12 oz bags rather than pounds.
- Buy whole bean, and an airtight container. Whole beans last longer than ground by the NCA’s own figures, and a sealed canister addresses air and light directly. A medium canister holding about a pound is the natural pairing for a pound bag — see best coffee canisters.
- Freeze the surplus, once. The NCA gives frozen beans 3 to 4 months, which turns a pound into a reasonable buy for a light drinker. Split it on the day you open it, freeze what you are not using within a couple of weeks, and do not keep taking the same bag in and out — how to store coffee beans has the method.
What this means if you are buying coffee as a gift
The arithmetic above gives a clear answer, and it is not the intuitive one: a pound is usually the wrong size for a gift. It costs more than a 12 oz bag while being likely to go stale before it is finished, unless you know they drink several cups a day. Two smaller bags of different coffees are a better present than one large bag of the same thing — more interesting to receive, and both get drunk fresh.
Where a pound is right: a household of two or more daily drinkers, an office, a cold brew habit, or a bag paired with somewhere airtight to keep it. For everything else, buy the 10 or 12 oz bag and spend the difference on something that makes the coffee better — which is usually a grinder or storage.
Four things that follow directly from this page, with live prices:
