Grinding Coffee Grounds in a Blender: A Quick Alternative

Quick answer

• You can make coffee grounds in a blender in a pinch, but it’s not ideal for consistent quality.
• A blender will produce an inconsistent grind size, with both fine powder and large chunks.
• This inconsistent grind can lead to uneven extraction, resulting in bitter or weak coffee.
• For the best results, a dedicated burr grinder is recommended for uniform particle size.
• If using a blender, pulse in short bursts and shake the blender to encourage a more even distribution.
• Be aware that blender blades can generate heat, which can negatively affect coffee flavor.

Who this is for

• Home coffee enthusiasts who don’t own a grinder and need coffee grounds immediately.
• Individuals experimenting with home brewing methods and looking for a quick workaround.
• Those who prioritize convenience over the absolute best coffee quality in a non-ideal situation.

What to check first

Brewer type and filter type

Before you grind, understand what you’re brewing with. Different brewers require different grind sizes. For example, a French press needs a coarse grind, while espresso requires a very fine grind. Using a blender will make achieving these specific grinds difficult. Check your brewer’s manual or online resources for recommended grind sizes.

Water quality and temperature

The water you use significantly impacts coffee flavor. Ideally, use filtered water. If your tap water has a strong taste, it will come through in your coffee. For brewing, water temperature is crucial. Aim for water between 195-205°F (90-96°C). Water that’s too hot can scald the grounds, leading to bitterness, while water that’s too cool will result in weak, underdeveloped coffee.

Grind size and coffee freshness

This is where using a blender becomes a challenge. Coffee loses its volatile aromatic compounds quickly after grinding, so fresh grounds are key. A blender will produce a mix of fine and coarse particles, making it hard to control extraction. Whole beans are best ground just before brewing. If you must use a blender, try to use it immediately after grinding.

Coffee-to-water ratio

A common starting point is a ratio of 1:15 to 1:18 (coffee to water by weight). For example, 20 grams of coffee to 300-360 grams of water. Using a scale is the most accurate way to measure. If you don’t have a scale, a general guideline is 1-2 tablespoons of grounds per 6 oz of water. However, with inconsistent grounds from a blender, this ratio can be harder to perfect.

Cleanliness/descale status

Ensure your blender and any brewing equipment are clean. Old coffee oils can turn rancid and impart off-flavors. If you use a coffee maker, descale it regularly according to the manufacturer’s instructions. Mineral buildup can affect brewing temperature and water flow, leading to poor extraction.

Step-by-step (brew workflow)

1. Measure Whole Beans: Measure out the whole coffee beans you intend to grind. Use a kitchen scale for accuracy, or a consistent measuring spoon.

• What “good” looks like: You have the correct amount of beans for your desired brew strength and volume.
• Common mistake: Eyeballing the amount, leading to too much or too little coffee. Avoid this by using a measuring tool consistently.

2. Add Beans to Blender: Pour the measured whole beans into the blender jar. Ensure the jar is dry and clean.

• What “good” looks like: Beans are loose in the blender and not packed down.
• Common mistake: Overfilling the blender, which prevents the blades from effectively processing all the beans. Don’t fill it more than halfway.

3. Select Pulse Setting: Choose the “pulse” or lowest speed setting on your blender. Avoid continuous high-speed blending.

• What “good” looks like: You are in control of the grinding duration.
• Common mistake: Running the blender continuously, which quickly turns beans into powder and can overheat them.

4. Pulse in Short Bursts: Pulse the blender for just a few seconds at a time (e.g., 5-10 seconds).

• What “good” looks like: You hear the beans being broken apart, not pulverized into dust.
• Common mistake: Pulsing for too long, which creates uneven particles and heat.

5. Shake Blender: After each short pulse, stop the blender, remove the lid, and shake the blender jar gently. This helps redistribute the beans and ensures more even grinding.

• What “good” looks like: The beans are mixed around, exposing different parts to the blades.
• Common mistake: Skipping this step, which leads to a very uneven grind with many large chunks and some fine dust.

6. Repeat Pulsing and Shaking: Continue pulsing in short bursts and shaking the blender until you achieve a grind that appears somewhat uniform. Aim for a consistency that resembles coarse sand or sea salt for drip coffee, or finer for other methods.

• What “good” looks like: The majority of particles are similar in size, though some variation is expected.
• Common mistake: Over-grinding to achieve uniformity, resulting in too much fine powder and potential bitterness.

7. Check Grind Consistency: Visually inspect the grounds. Look for a mix of particle sizes.

• What “good” looks like: You see a range of sizes, but not an extreme difference between dust and pebbles.
• Common mistake: Believing the grind is uniform when it’s not, leading to poor brewing.

8. Prepare Brewing Equipment: While you’re grinding, ensure your brewing device is ready. This includes preheating your mug or carafe and preparing your filter (if applicable).

• What “good” looks like: Everything is ready to go for brewing immediately after grinding.
• Common mistake: Letting the grounds sit for too long after grinding, which degrades freshness.

9. Add Grounds to Brewer: Transfer the freshly ground coffee into your brewing device.

• What “good” looks like: All the grounds are in the brewer without significant loss.
• Common mistake: Leaving grounds stuck to the blender jar, reducing the amount of coffee used.

10. Brew Coffee: Proceed with your usual brewing method, paying attention to water temperature and brew time.

• What “good” looks like: The brewing process proceeds as expected, with proper saturation and extraction.
• Common mistake: Not adjusting brew time or water flow for the inconsistent grind, which can lead to over- or under-extraction.

11. Taste and Adjust: Taste the brewed coffee. Note any bitterness, sourness, or weakness.

• What “good” looks like: You can identify specific flavor notes or issues.
• Common mistake: Not tasting or not recognizing what causes the off-flavors.

Common mistakes (and what happens if you ignore them)

Mistake	What it causes	Fix
Overfilling the blender	Inconsistent grind, some beans unground, others pulverized into dust.	Grind in smaller batches, ensuring beans have room to move.
Continuous high-speed blending	Overheating coffee, burning grounds, creating excessive fines and bitterness.	Use the pulse function only, in short bursts.
Not shaking the blender	Large chunks of unground beans and very fine powder.	Shake the blender between pulses to redistribute beans.
Grinding too fine for the brewer	Clogged filter, over-extraction, bitter coffee.	Aim for a coarser grind if unsure, or check brewer recommendations.
Grinding too coarse for the brewer	Under-extraction, weak, sour coffee.	Aim for a finer grind if unsure, or check brewer recommendations.
Letting grounds sit for too long	Stale coffee flavor, loss of aroma and nuanced taste.	Grind only what you need immediately before brewing.
Not cleaning the blender	Rancid oils imparting off-flavors.	Wash the blender jar thoroughly after each use.
Using hot beans or blender jar	Can negatively affect flavor by pre-heating or “cooking” the coffee.	Ensure beans are at room temperature and the blender jar is dry and cool.
Not checking grind consistency visually	Uneven extraction, leading to a mix of bitter and sour notes in the cup.	Take a moment to look at the grounds before brewing; shake and pulse more if needed.
Using an old or dull blender blade	Inefficient grinding, more heat generated, less consistent particle size.	Ensure your blender has sharp blades for better results.

Decision rules (simple if/then)

• If you need coffee right now and have no grinder, then use a blender because it’s a temporary solution.
• If your blender creates too much dust, then pulse for shorter durations because short bursts prevent over-grinding.
• If your coffee tastes bitter, then your grind might be too fine or you over-extracted, so try a slightly coarser grind next time or shorten brew time.
• If your coffee tastes sour or weak, then your grind might be too coarse or you under-extracted, so try a slightly finer grind next time or lengthen brew time.
• If you are brewing with a French press, then aim for a coarse grind because large particles are needed to avoid sediment.
• If you are brewing with a pour-over or drip machine, then aim for a medium grind because this size allows for proper water flow and extraction.
• If you have whole beans and a blender, then pulse in short bursts and shake between pulses to get a more even grind because this mimics the action of a grinder better.
• If the blender jar feels warm after grinding, then you may have generated too much heat, which can negatively impact flavor.
• If you are brewing espresso, then using a blender is highly discouraged because espresso requires a very precise, fine grind that a blender cannot achieve.
• If you notice large chunks of unground beans, then you need to pulse more and shake the blender more vigorously because the beans aren’t getting evenly processed.
• If your goal is the best possible cup, then invest in a burr grinder because it provides consistent particle size for optimal extraction.

FAQ

Can I really make coffee grounds in a blender?

Yes, you can grind coffee beans in a blender as a last resort. It’s not ideal for achieving a uniform grind, but it can get you coffee in a pinch.

Will blender-ground coffee taste bad?

It might not taste as good as coffee ground with a dedicated grinder. The inconsistent particle size leads to uneven extraction, which can result in bitterness or weakness.

What’s the best way to grind coffee in a blender?

Use the pulse function in very short bursts, and shake the blender between pulses. This helps distribute the beans and break them down more evenly.

How fine should the grounds be when using a blender?

This depends on your brewing method, but aim for a consistency that resembles coarse sand for drip coffee. You’ll have a mix of sizes, so try to get the majority in that range.

Is it okay if some beans remain whole or turn to powder?

It’s common when using a blender. The whole beans will under-extract (sour), and the powder will over-extract (bitter), leading to a less balanced cup.

How do I avoid overheating the coffee in the blender?

Use short pulses and let the blender cool between grinding sessions. Avoid continuous blending, as this generates significant heat.

Should I wash my blender after grinding coffee?

Yes, it’s a good idea to wash your blender jar thoroughly afterward to remove any residual coffee oils that could go rancid.

What’s the biggest difference between blender grounds and grinder grounds?

A burr grinder produces uniform particle sizes, leading to even extraction and better flavor. A blender creates a mix of fine and coarse particles, resulting in uneven extraction.

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

• Specific recommendations for blender models suitable for grinding coffee.
• Detailed analysis of the chemical compounds affected by heat during blending.
• Advanced techniques for correcting extraction issues caused by blender-ground coffee.

If you’re serious about improving your home coffee, consider exploring:

• The benefits of burr grinders versus blade grinders.
• Optimal grind sizes for various brewing methods.
• The science of coffee extraction and how grind size impacts it.