How Many Cups Of Coffee From 340 Grams?

Quick answer

• A standard 12oz cup of brewed coffee uses about 20-25 grams of whole beans.
• So, 340 grams of beans will make roughly 13-17 cups of coffee.
• This is a general guideline; your exact yield depends on brew method and strength preference.
• Smaller “coffee mug” sizes (8-10oz) will yield more cups.
• Larger travel mugs (16-20oz) will yield fewer cups.
• Always measure your coffee grounds for consistent results.

Who this is for

• Home coffee brewers who buy beans in bulk.
• Anyone looking to estimate their coffee supply.
• People who want to understand the math behind their daily brew.

What to check first

Brewer type and filter type

Your brewer dictates how much water is used and how much coffee is extracted. A pour-over might use a paper filter that absorbs some oils, while an AeroPress uses a metal filter. This can subtly affect the final volume.

Water quality and temperature

Good water makes good coffee. If your water tastes off, your coffee will too. Aim for clean, filtered water. Water temperature is also key for extraction – too hot burns, too cool under-extracts. Generally, 195-205°F (90-96°C) is the sweet spot.

Grind size and coffee freshness

Freshly roasted, freshly ground coffee is king. Old beans lose flavor. Grind size matters a ton. Too fine clogs filters and leads to over-extraction (bitter). Too coarse results in under-extraction (weak, sour). Match your grind to your brewer.

Coffee-to-water ratio

This is the big one for yield. A common starting point is a 1:15 to 1:17 ratio (coffee to water by weight). So, for 340 grams of coffee, you’d use roughly 5100 to 5780 grams (or ml) of water. This translates to a lot of coffee.

Cleanliness/descale status

A dirty brewer or clogged filter basket can mess with flow and extraction. Scale buildup affects temperature and taste. A clean machine is a happy machine, and it makes better coffee. Give it a good scrub regularly.

Step-by-step (brew workflow)

Let’s say you’re making a drip coffee. This is a common setup.

1. Weigh your beans.

• What to do: Use a scale to measure out 20-25 grams of whole beans.
• What “good” looks like: An accurate measurement on your digital scale.
• Common mistake: Guessing. This leads to inconsistent brews. Use a scale, folks.

2. Heat your water.

• What to do: Heat filtered water to 195-205°F (90-96°C).
• What “good” looks like: Water just off the boil, not aggressively bubbling.
• Common mistake: Using boiling water. It can scorch the grounds, making bitter coffee. Let it sit for 30 seconds after boiling.

3. Grind your coffee.

• What to do: Grind your beans to a medium consistency, like coarse sand.
• What “good” looks like: Evenly sized particles.
• Common mistake: Using pre-ground coffee that’s been sitting around. It loses flavor fast. Grind right before brewing.

4. Prepare your brewer.

• What to do: Place your filter in the basket. Rinse paper filters with hot water.
• What “good” looks like: A clean filter that’s settled correctly.
• Common mistake: Not rinsing paper filters. This can leave a papery taste.

5. Add grounds to the filter.

• What to do: Put your freshly ground coffee into the prepared filter.
• What “good” looks like: A level bed of grounds.
• Common mistake: Tamping down the grounds too much. This restricts water flow.

6. Bloom the coffee.

• What to do: Pour just enough hot water (about twice the weight of the grounds) to saturate all the grounds. Wait 30 seconds.
• What “good” looks like: The grounds puff up and release CO2.
• Common mistake: Skipping the bloom. You miss out on degassing, which improves flavor.

7. Begin the main pour.

• What to do: Slowly pour the remaining hot water over the grounds in a circular motion.
• What “good” looks like: A steady, controlled pour that saturates the grounds evenly.
• Common mistake: Pouring too fast or all at once. This can create channels and lead to uneven extraction.

8. Allow to finish dripping.

• What to do: Let all the water drip through the coffee bed.
• What “good” looks like: A consistent drip rate, ending with a mostly dry puck of grounds.
• Common mistake: Pulling the brewer too early. You’ll have weak coffee.

9. Serve and enjoy.

• What to do: Pour the brewed coffee into your favorite mug.
• What “good” looks like: Aromatic, delicious coffee.
• Common mistake: Letting it sit on a hot plate for too long. It gets burnt. Drink it fresh.

Common mistakes (and what happens if you ignore them)

Mistake	What it causes	Fix
Using stale coffee beans	Flat, dull, or papery taste	Buy fresh beans and store them properly (airtight, cool, dark).
Incorrect grind size	Bitter (too fine) or weak/sour (too coarse)	Adjust grinder setting to match brew method.
Inconsistent coffee-to-water ratio	Coffee too strong or too weak	Use a scale for both coffee and water.
Water too hot or too cold	Scorched/bitter (too hot) or under-extracted/sour (too cold)	Use a thermometer or let boiling water sit for 30-60 seconds.
Not cleaning the brewer	Off-flavors, slow brewing, clogged parts	Descale regularly and clean all removable parts after each use.
Skipping the bloom	Uneven extraction, gassy coffee	Always perform the bloom for 30 seconds.
Rushing the brew process	Under-extraction, weak flavor	Allow sufficient time for water to flow through the grounds.
Using tap water with off-flavors	Coffee tastes like tap water	Use filtered water.
Over-extracting	Bitter, harsh taste	Check grind size, water temp, and brew time.
Under-extracting	Sour, weak, watery taste	Check grind size, water temp, and brew time.

Decision rules (simple if/then)

• If your coffee tastes bitter, then try a coarser grind because finer grinds can over-extract.
• If your coffee tastes weak, then try a finer grind because coarser grinds can under-extract.
• If you are brewing espresso, then use a much finer grind than drip because espresso requires high pressure and fast extraction.
• If your brew time is too short, then try a finer grind because it will slow down water flow.
• If your brew time is too long, then try a coarser grind because it will speed up water flow.
• If you are using a French press, then use a coarser grind because the metal filter allows more fines through.
• If you are using a paper filter, then a slightly finer grind can work well because the paper filters out more fines.
• If your coffee has a papery taste, then rinse your paper filter thoroughly with hot water before brewing.
• If you’re brewing a large batch, then ensure your water is hot enough to maintain temperature throughout the brew.
• If you’re making a single cup, then be extra careful with your measurements because small errors are more noticeable.
• If your coffee tastes “off” and you can’t pinpoint why, then clean your brewer thoroughly because old coffee oils are often the culprit.

FAQ

How many standard cups of coffee can I make from 340 grams of beans?

Using a common ratio of 1:16 (coffee to water), 340 grams of beans would require about 5440 grams (or ml) of water. This typically yields around 13-17 standard 8oz cups, depending on how much water is absorbed by the grounds and any evaporation.

Does the type of coffee bean affect how many cups I get?

Not directly in terms of volume from a set weight of beans. However, darker roasts are less dense and might require slightly different grinding or tamping techniques depending on the brew method. The flavor will be different, but the weight-to-yield ratio is consistent.

What’s the best way to store 340 grams of coffee beans?

Store them in an airtight container, away from light, heat, and moisture. Avoid the refrigerator or freezer unless you plan to store them for extended periods and vacuum seal them. For daily use, an opaque canister on the counter is usually fine.

How do I calculate the amount of water needed for 340 grams of coffee?

Use a coffee-to-water ratio. A good starting point is 1:15 to 1:17. For 340 grams of coffee, multiply by your chosen ratio. For example, 340g x 16 = 5440g (or ml) of water.

Can I use 340 grams of pre-ground coffee?

Yes, but it’s not ideal. Pre-ground coffee loses its aroma and flavor much faster than whole beans. If you must, store it in an airtight container and use it as quickly as possible for the best taste.

Does the brew method matter for yield from 340 grams?

Yes, slightly. Methods like French press or pour-over might absorb a little more water into the grounds than an espresso machine. However, the overall yield from 340 grams will still be in a similar ballpark regardless of method.

What is a “cup” of coffee in brewing terms?

In the US, a standard coffee cup is often considered 8 fluid ounces. However, many coffee makers use a 5-6oz “cup” measurement, which can be confusing. It’s best to measure your final liquid volume if precision is key.

What this page does NOT cover (and where to go next)

• Specific espresso extraction ratios and volumes.
• Detailed guides on advanced brewing techniques like siphon or cold brew.
• Troubleshooting specific machine errors or maintenance schedules.
• The impact of different water mineral content on flavor profiles.
• Comparisons of specific coffee bean origins or roast levels.