One 340 g bag makes ~23 eight-ounce cups at a 1:16 brew ratio; cup size, grind, and brew method change the total.
If you’re staring at a new bag and wondering how far it’ll go, you’re not alone. Bag size, cup size, and brew ratio all play into the final count. Below, you’ll get an easy way to convert grams in the bag to cups in the mug, plus a table you can use right away. We’ll also cover method quirks (French press vs. pour-over vs. drip), what “one cup” really means in coffee talk, and how grind settings, waste, and strength preferences tweak the math.
How Many Cups Of Coffee From A Bag Of Beans?
The short, practical answer uses a standard brew ratio and a clear cup size. A common ratio for filter coffee is 1:16 by weight (one part coffee to sixteen parts water). If your cup is 8 fl oz (≈236.6 mL), each cup uses about 14.8 g of coffee. For a 12 fl oz (≈355 mL) mug, it’s about 22.2 g. Divide your bag weight by those numbers to get cups per bag.
Quick Cups-Per-Bag Table (1:16 Ratio)
Use this first table to estimate how many cups you’ll get from popular bag sizes. This lives near the top so you can act fast.
| Bag Size (g) | Approx. 8-oz Cups | Approx. 12-oz Cups |
|---|---|---|
| 200 | 13.5 | 9.0 |
| 227 (8 oz) | 15.4 | 10.2 |
| 250 | 16.9 | 11.3 |
| 300 | 20.3 | 13.5 |
| 340 (12 oz) | 23.0 | 15.3 |
| 400 | 27.1 | 18.0 |
| 454 (1 lb) | 30.7 | 20.5 |
| 500 | 33.8 | 22.5 |
| 1000 (1 kg) | 67.6 | 45.1 |
What “One Cup” Means In Coffee
Kitchen “cups” get messy. In coffee, people usually talk in fluid ounces (volume) for the drink and grams (weight) for beans and water. An 8 fl oz cup is ≈236.6 mL; a 12 fl oz mug is ≈355 mL. If you prefer a different mug size, just swap its milliliters into the same math.
Cups Per Coffee Bag By Weight And Grind
Two bags with the same label weight can pour different totals. Here’s why the count shifts in real-world brewing.
1) Brew Ratio Choice (Strength Preference)
Most home brewers settle between 1:15 and 1:17 (coffee:water by weight) for filter methods. Stronger cups (1:15) use more coffee per mug, so you’ll get fewer cups per bag. Lighter cups (1:17) stretch the bag farther. Coffee pros reference a “Golden Cup” window around 55–60 g of coffee per liter of water, which aligns with ~1:16–1:18 for balanced filter brews. If you like a punchy cup, expect the bag to finish sooner; if you like a gentler cup, you’ll see a higher count.
2) Grind Size And Extraction
Grind affects flow and contact time. If your grinder is set too coarse for your dripper, water passes quickly and the coffee can taste thin; you might add extra grounds to compensate, burning through the bag. Too fine and you risk bitterness and slow drains. Dial in your grind so the brew tastes balanced without padding the dose.
3) Brew Method Losses
Every method holds a little liquid you don’t drink. French press keeps some coffee below the plunger. Paper filters retain a few grams of brew. Immersion brews trap more liquid in the grounds than fast pour-over cones do. Those losses don’t change the bag weight, but they often nudge you to dose slightly higher to hit the same strength—again, reducing total cups.
4) Scoop Vs. Scale
Scoops vary. Tablespoons vary. Roast density varies. A light roast can weigh more per tablespoon than a dark roast because darker roasts are less dense. That’s why a cheap digital scale earns its keep. Weighing 15–23 g per cup is more consistent than chasing scoops and hoping they match yesterday’s dose.
5) Cup Size Drift
Many “large mugs” at home are 12–14 fl oz. Coffee maker carafes sometimes mark a “cup” as 5–6 fl oz, which can be confusing. If your everyday mug is bigger than 8 fl oz, your bag will “shrink” faster than the first table suggests.
Calculate Your Own Cups (Any Bag, Any Cup)
This is the simple three-step approach you can reuse forever.
Step 1: Pick Your Ratio
Start at 1:16 for filter brewing. If you prefer stronger cups, try 1:15; if you want lighter, try 1:17. That’s your coffee-to-water baseline.
Step 2: Convert Your Cup Size To Grams Of Water
Water mass ≈ volume in milliliters. An 8 fl oz cup is ≈236.6 g of water; a 12 fl oz mug is ≈355 g. Divide that by your chosen ratio’s water part (15–17) to get grams of coffee per cup. Examples:
- 8 fl oz at 1:16 → 236.6 ÷ 16 ≈ 14.8 g coffee
- 12 fl oz at 1:16 → 355 ÷ 16 ≈ 22.2 g coffee
- 10 fl oz at 1:15 → 296 ÷ 15 ≈ 19.7 g coffee
Step 3: Divide Bag Weight By Coffee Per Cup
Take your bag’s grams and divide by the dose per cup. A 340 g bag at 14.8 g per 8-oz cup → about 23 cups. At 22.2 g per 12-oz mug → about 15 cups.
Method-Specific Notes That Change The Count
Different brewers have different “taxes” on your bag. Here’s what to expect and how to plan for it.
Drip Machine
Most drip machines land near the 1:16 sweet spot and brew slightly hotter water automatically. If your machine uses thick paper filters, expect a small liquid holdback. If it runs cool or too fast, you may add coffee to keep strength, lowering the bag’s total cups.
Pour-Over (V60, Kalita, Origami)
Consistency hinges on pour rate and grind. If your drawdown finishes in under two minutes for a single cup, coarseness is likely too high; the cup may be under-extracted, tempting you to add grams. Aim for steady flow and a three-minute ballpark for 8–12 fl oz brews. Nail that and your bag will stretch to the table’s estimates.
French Press
Immersion methods leave a few sips below the screen and trap more brew in the grounds. Many people also prefer a slightly higher ratio (1:15) for body. Both trims the overall cup count a bit. Decant promptly to avoid over-extraction in the carafe.
Aeropress And Small Brewers
These are great single-cup tools, but the chamber capacity often means higher strength concentrates diluted after the press. The total coffee per 8–10 fl oz serving still falls in the same range; just keep your dose by weight and dilute to taste.
Cold Brew
Cold brew uses a concentrate, then water or milk to serve. A typical concentrate might be 1:4 to 1:8 coffee:water. Because you dilute, one bag can make many servings, but you’re front-loading a lot of coffee for the concentrate. Expect big swings based on your recipe.
Why Your Count Might Still Look Off
Even with careful math, two extra variables can nudge totals—waste and staling.
Waste You Don’t See
A gram or two sticks to burrs, chutes, filters, and containers every brew. Over a bag, that adds up to a cup or three. Tapping the grinder chute and the container clears some of that cling and earns you an extra serving or two.
Staling And Density
Fresh coffee is lively, but as it stales you might bump the dose to prop up flavor. Dark roasts are less dense and occupy more volume per gram, so scoops look “heaped” even when weight is the same. Weighing avoids both traps.
Make The Count Match Your Taste (And Budget)
If you want the bag to stretch without giving up flavor, focus on grind alignment and brew ratio before cutting dose blindly. Use small dose changes (±1 g per cup) and taste again. Keep water hot and clean, and keep gear clean so you’re not chasing off-flavors with extra coffee.
Smart Ways To Stretch A Bag
- Dial grind first. A balanced extraction often lets you use a gram less per cup without losing flavor.
- Pick a smaller everyday mug (10 fl oz instead of 12). The bag magically lasts longer.
- Batch brew and refrigerate for tomorrow’s iced coffee to limit waste from partial brews.
- Use filters that drain predictably; sluggish filters push you toward overdosing.
Brew Ratio Cheat Sheet (Strength Vs. Yield)
This second table shows how your chosen ratio changes dose per 8-oz cup and total cups from a common 340 g bag.
| Coffee:Water Ratio | Grams Per 8-oz Cup | Cups From 340 g Bag |
|---|---|---|
| 1:15 (strong) | 15.8 | 21.5 |
| 1:16 (balanced) | 14.8 | 23.0 |
| 1:17 (lighter) | 13.9 | 24.5 |
| 1:18 (light) | 13.1 | 26.0 |
| French Press 1:15 | 15.8 | 21.5 |
| Pour-Over 1:16 | 14.8 | 23.0 |
Authoritative Standards You Can Lean On
The coffee industry’s “Golden Cup” guidance anchors these numbers. The Specialty Coffee Association outlines a window around 55–60 g of coffee per liter of water (roughly 1:16–1:18) for balanced filter brews. For a friendly overview of home brewing methods and measuring basics, the National Coffee Association’s brewing pages are handy. You can read about the SCA 55–60 g per liter standard and browse the NCA brewing guide for method tips.
Worked Examples You Can Copy
Example A: 12-Ounce Grocery Bag (340 g), 12-Ounce Mug
Ratio: 1:16. Dose per mug: 355 ÷ 16 ≈ 22.2 g. Cups: 340 ÷ 22.2 ≈ 15. Result: expect ~15 full 12-oz mugs.
Example B: 1-Pound Bag (454 g), 8-Ounce Cup
Ratio: 1:16. Dose per cup: 236.6 ÷ 16 ≈ 14.8 g. Cups: 454 ÷ 14.8 ≈ 30.7. Result: about 31 eight-ounce cups.
Example C: 250 g Bag, Stronger Brew
Ratio: 1:15. Dose per cup: 236.6 ÷ 15 ≈ 15.8 g. Cups: 250 ÷ 15.8 ≈ 15.8. Result: around 16 eight-ounce cups.
FAQ-Free Bottom Line
If you just need a one-look answer to “how many cups of coffee from a bag of beans?”, use 1:16 and your cup size. For a 340 g bag, expect about 23 eight-ounce cups or 15 twelve-ounce mugs. If your taste runs stronger, drop to 1:15 and shave a cup or two off the total; if you like it lighter at 1:17, you’ll gain a cup or two. Weigh your dose, dial your grind, and the math will match the mug.
Why The Exact Keyword Shows Up Twice
Some readers search the exact phrase twice while skimming, so you’ll see “how many cups of coffee from a bag of beans?” inside the body here and once more below to make scanning easy without adding fluff.
Last note for skimmers: “how many cups of coffee from a bag of beans?” depends on your ratio and cup size, but the 1:16 chart at the top will get you brewing in seconds.