How to Reduce Coffee Acidity with Baking Soda

Quick answer

• A tiny pinch of baking soda can neutralize coffee acidity.
• It works by raising the pH of the coffee.
• Use a very small amount, like 1/16th of a teaspoon per cup.
• Too much will make your coffee taste salty and weird.
• This is a quick fix, not a brewing technique.
• Consider other methods for naturally lower-acid coffee.

Who this is for

• Folks who love coffee but get heartburn or an upset stomach.
• Anyone looking for a simple, immediate way to mellow out their brew.
• People who have a bag of coffee they like but find it too acidic.

What to check first

Brewer type and filter type

Most brewing methods work, but some might be easier to adjust. Drip machines, French presses, pour-overs – they all get the job done. The filter type matters less for acidity adjustment, but paper filters can sometimes remove oils that contribute to flavor.

Water quality and temperature

Start with good water. If your tap water is funky, your coffee will be too. For temperature, aim for that sweet spot between 195-205°F. Too cool, and you won’t extract properly. Too hot, and you can scorch the grounds, which can also impact acidity perception.

Grind size and coffee freshness

Freshly roasted beans are key. Stale coffee can taste bitter and harsh. Grind size depends on your brewer. Too fine for a drip machine can lead to over-extraction and bitterness. Too coarse for a pour-over might result in weak coffee.

Coffee-to-water ratio

This is your foundation. A common starting point is 1:15 to 1:18 (coffee to water by weight). So, for 30 grams of coffee, you’d use around 450-540 grams of water. Too much coffee means a stronger, potentially more acidic cup. Too little, and it’s just weak.

Cleanliness/descale status

Give your machine a good clean. Old coffee oils and mineral buildup can make your brew taste off, sometimes contributing to a perceived harshness. Descale your machine regularly, especially if you have hard water. It’s a game-changer.

Step-by-step (brew workflow)

1. Gather your gear: Get your brewer, coffee, water, and a way to measure.

• Good looks like: Everything is clean and ready to go.
• Common mistake: Using a dirty brewer. Avoid this by rinsing parts and cleaning regularly.

2. Measure your coffee: Weigh out your beans or grounds.

• Good looks like: Accurate measurement for consistent results.
• Common mistake: Guessing the amount. This leads to wildly different brews.

3. Grind your beans (if using whole beans): Grind to the appropriate size for your brewer.

• Good looks like: A uniform grind that matches your brew method.
• Common mistake: Grinding too fine or too coarse. Check your brewer’s recommendations.

4. Heat your water: Bring fresh, filtered water to the right temperature.

• Good looks like: Water between 195-205°F.
• Common mistake: Using boiling water. Let it cool for about 30 seconds after it boils.

5. Prepare your filter: Place your filter in the brewer and rinse it with hot water.

• Good looks like: Filter is seated correctly and rinsed to remove papery taste.
• Common mistake: Skipping the rinse. This can leave a papery aftertaste.

6. Add coffee grounds: Put your measured grounds into the filter.

• Good looks like: Grounds are evenly distributed.
• Common mistake: Tamping down the grounds too much. This can impede water flow.

7. Bloom the coffee: Pour a small amount of hot water over the grounds, just enough to saturate them. Let it sit for 30 seconds.

• Good looks like: The grounds puff up and release CO2.
• Common mistake: Pouring all the water at once. The bloom is crucial for even extraction.

8. Pour the remaining water: Slowly pour the rest of the hot water over the grounds, using a consistent pattern.

• Good looks like: A steady, controlled pour that saturates all the grounds.
• Common mistake: Pouring too fast or unevenly. This can lead to channeling and uneven extraction.

9. Let it brew: Allow the coffee to drip through completely.

• Good looks like: The brewer finishes its cycle without any issues.
• Common mistake: Rushing the process. Patience is a virtue here.

10. Add baking soda (optional): If you’re using baking soda, add a tiny pinch (about 1/16 tsp per 8 oz cup) to the brewed coffee in your mug.

• Good looks like: A very small amount that dissolves quickly.
• Common mistake: Adding too much. This will ruin the taste. Seriously, just a pinch.

11. Stir and enjoy: Stir the coffee (especially if you added baking soda) and taste.

• Good looks like: A smooth, enjoyable cup of coffee.
• Common mistake: Not stirring well if baking soda was added. You’ll get a weird salty sip.

Common mistakes (and what happens if you ignore them)

Mistake	What it causes	Fix
Using stale coffee beans	Bitter, dull, or harsh flavor; can increase perceived acidity	Use freshly roasted beans, ideally within 2-4 weeks of roast date.
Incorrect grind size	Over-extraction (bitter, sour) or under-extraction (weak, sour)	Match grind size to your brewer. Check recommendations for your specific device.
Water too hot or too cold	Scorched flavor or weak, sour coffee	Aim for 195-205°F. Let boiling water cool for 30-60 seconds.
Dirty brewer or filter	Off-flavors, bitterness, and can mimic acidity	Clean your brewer regularly. Descale if needed. Rinse paper filters.
Incorrect coffee-to-water ratio	Weak, sour, or overly bitter coffee	Start with a 1:15 to 1:18 ratio (coffee:water by weight) and adjust.
Adding too much baking soda	Salty, metallic taste; ruins the coffee	Use a <em>tiny</em> pinch, no more than 1/16th teaspoon per 8 oz cup. Test first.
Not blooming the coffee	Uneven extraction, leading to sourness and bitterness	Always do a bloom pour for 30 seconds to release CO2.
Pouring water too quickly/unevenly	Channeling, leading to under- and over-extraction	Pour slowly and consistently in a circular motion.
Not stirring baking soda adequately	Pockets of salty coffee	Stir thoroughly until fully dissolved.
Using low-quality or hard water	Off-flavors, mineral taste, and potential scaling	Use filtered water.

Decision rules (simple if/then)

• If your coffee tastes bitter and harsh, then check your grind size and water temperature because these are common culprits.
• If your coffee tastes sour, then check your grind size and brew time because it might be under-extracted.
• If you experience heartburn after coffee, then try a darker roast or a cold brew because these methods tend to be lower in acidity.
• If you want to try baking soda, then start with a tiny pinch because too much makes it undrinkable.
• If you’re using a French press, then coarser grounds are usually better because fine grounds can lead to over-extraction.
• If you’re using a drip machine, then a medium grind is generally best because it balances extraction.
• If your coffee tastes weak, then check your coffee-to-water ratio and grind size because you might be using too little coffee or too coarse a grind.
• If your coffee has an unpleasant metallic taste, then it might be your water or a dirty brewer, not the coffee itself.
• If you want a naturally less acidic cup, then consider beans labeled “low acid” or from specific regions known for lower acidity.
• If your coffee tastes flat, then ensure your beans are fresh and your water is at the correct temperature.
• If you’re unsure about your brewer’s specific needs, then consult its manual for recommended grind size and ratios.

FAQ

Does baking soda actually make coffee less acidic?

Yes, baking soda is alkaline and can neutralize acids. A small amount added to coffee can raise its pH, making it feel less acidic on your stomach.

How much baking soda should I use?

Start with a tiny pinch, about 1/16th of a teaspoon for an 8 oz mug. You can add a bit more if needed, but be careful not to overdo it.

Will baking soda change the taste of my coffee?

It can. Too much baking soda will make your coffee taste salty and unpleasant. A very small amount should have a minimal impact on flavor, though some people can detect it.

Is this a good way to improve my coffee brewing?

Not really. Adding baking soda is a quick fix for acidity after brewing. It doesn’t improve the fundamental brewing process or the coffee’s inherent flavor.

Are there other ways to make coffee less acidic?

Absolutely. Try darker roasts, cold brew, or beans specifically labeled as low-acid. These methods naturally produce less acidic coffee.

Can I put baking soda directly in my coffee maker?

No, definitely not. Baking soda should only be added to the brewed coffee in your mug. Putting it in the machine can damage it and create a mess.

What if my coffee is bitter, not just acidic?

Bitterness is usually a sign of over-extraction. Check your grind size, water temperature, and brew time. Baking soda won’t fix bitterness.

Is it safe to drink coffee with baking soda?

For most people, yes, in small amounts. Baking soda is a common food ingredient. However, if you have dietary restrictions or health concerns, check with your doctor.

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

• Detailed explanations of specific coffee bean varietals and their natural acidity levels.
• Advanced brewing techniques like siphon or Aeropress beyond basic principles.
• The science behind specific chemical compounds contributing to coffee’s acidity.
• Reviews or recommendations for specific coffee brands or grinders.
• Troubleshooting complex flavor profiles beyond acidity and bitterness.