How to Make Cold Brew Coffee at Home: The Complete Step-by-Step Guide
Cold brew coffee is one of the easiest things you can make at home — and one of the most misunderstood. No special equipment. No heat. Just coffee, cold water, time, and the right beans. This guide covers everything: the exact ratio, steep times, how to make concentrate, and why your bean choice matters more than you think.
Most people assume cold brew requires a fancy gadget or a trip to Starbucks. It doesn’t. You need a jar, a coffee filter or fine-mesh strainer, and about 12–24 hours. That’s it.
But here’s what those $7 coffee shop cold brews won’t tell you: the quality of your beans determines everything. Cold brew amplifies your coffee’s natural character — its sweetness, its smoothness, its acidity. Use the wrong beans and you’ll extract every flaw. Use naturally low-acid, clean beans and you’ll get something genuinely exceptional.
This guide gives you the complete method, troubleshooting tips, concentrate ratios, and a breakdown of why allergen-free, low-acid beans make the best cold brew — especially if your stomach has ever pushed back on coffee.
What Is Cold Brew Coffee (And Why Is It Different)?
Cold brew is coffee brewed with cold or room-temperature water over an extended period — typically 12 to 24 hours — instead of hot water for a few minutes. No heat. No pressure. Just slow extraction.
This slow process changes the chemistry of what ends up in your cup. Heat extracts certain acids and bitter compounds quickly. Cold water, given time, skips most of those compounds entirely — pulling out the sweeter, smoother, more chocolaty notes while leaving behind a significant portion of the acidity.
Cold Brew vs. Iced Coffee: The Real Difference
Iced coffee is brewed hot and then poured over ice. It’s faster but retains all the acidity and bitterness of hot-brewed coffee — often amplified once the ice melts and dilutes the flavor further.
Cold brew is never heated. The result is a concentrate (or ready-to-drink brew) that’s noticeably smoother, naturally sweeter, and significantly less acidic — research shows hot-brewed coffee contains up to 50% more total titratable acid than cold brew prepared from the same beans.
That acidity difference is why cold brew has become a go-to for people with sensitive stomachs, acid reflux, or GERD. If hot coffee bothers you but you miss the ritual, cold brew is often the answer — especially when you start with beans that are already naturally low-acid. (We’ll get to that.)
What You Need to Make Cold Brew at Home
Before we get to the method, here’s your full equipment list. You probably already have most of this.
☕ Equipment Checklist
- Large mason jar or pitcher (32 oz minimum; 64 oz for a full batch)
- Fine-mesh strainer OR cheesecloth OR paper coffee filter
- Kitchen scale (highly recommended for consistent ratios)
- Coarsely ground coffee (the most important variable — more on this below)
- Filtered cold water (tap works but filtered produces cleaner flavor)
- Refrigerator with space for overnight steeping
No cold brew maker required. A mason jar and a strainer produce results just as good as any dedicated gadget.
How to Make Cold Brew Coffee: Step-by-Step
This is the standard immersion method — the easiest and most consistent approach for home brewers. You can make either ready-to-drink cold brew or cold brew concentrate (the ratios are different — both covered below).
Step 1: Grind Your Coffee Coarsely
Cold brew requires a coarse grind — similar to raw sugar or coarse sea salt. Fine grinds over-extract during the long steep and produce bitter, murky results. If you’re buying pre-ground, look for a product labeled “cold brew grind” or “coarse grind.”
Step 2: Measure Your Ratio
For ready-to-drink cold brew: Use a 1:8 ratio (1 part coffee to 8 parts water by weight). For a 32 oz batch: 4 oz (113g) coffee to 32 oz (907ml) water.
For cold brew concentrate: Use a 1:4 ratio (1 part coffee to 4 parts water). You’ll dilute this 1:1 with water or milk before drinking.
Step 3: Combine Coffee and Water
Add your coarsely ground coffee to your mason jar or pitcher. Pour in your cold or room-temperature filtered water. Stir gently to make sure all the grounds are saturated — dry pockets on top will under-extract. No need to stir after this point.
Step 4: Steep in the Refrigerator
Cover loosely and place in the refrigerator. Steep for 12–24 hours. Twelve hours gives you a lighter, brighter cup. Twenty-four hours gives you deeper, more concentrated flavor. Most brewers land between 16–20 hours as a sweet spot. Room-temperature steeping works but speeds up extraction — limit to 12 hours max if brewing at room temp to avoid over-extraction.
Step 5: Strain the Coffee
Pour your cold brew through a fine-mesh strainer lined with a paper filter or cheesecloth into a clean jar or pitcher. Don’t press or squeeze the grounds — this forces bitter compounds into your finished brew. Let gravity do the work. Straining typically takes 5–10 minutes.
Step 6: Store and Serve
Transfer strained cold brew to a sealed jar or airtight container. Refrigerate and consume within 7–14 days. Serve over ice, dilute concentrate 1:1 with water, or use as the base for cold brew lattes. No reheating needed — though cold brew can be gently warmed if you prefer a hot cup without the acidity of traditional hot-brewed coffee.
Cold Brew Ratios: The Complete Guide
Getting the ratio right is the single most impactful variable in home cold brew. Here’s a quick reference:
How to Make Cold Brew Concentrate
Concentrate is the smarter batch-brew approach. You brew at a 1:4 ratio, store the concentrated base in the fridge, and dilute per cup. This way you’re not storing a large container of finished cold brew — you’re storing a smaller, more shelf-stable concentrate that lasts up to 2 weeks.
To make a 32 oz concentrate batch: Use 8 oz (227g) of coarsely ground coffee and 32 oz (907ml) of cold water. Steep 18–24 hours, strain, and refrigerate. When serving, pour 4 oz concentrate over ice and top with 4 oz cold water (or milk of your choice). That’s one 8 oz serving.
Why Your Bean Choice Is the Most Underrated Variable
Here’s the thing most cold brew tutorials skip entirely: the beans you choose determine the ceiling on your cold brew. No ratio or steep time adjustment can compensate for bitter, moldy, or high-acid coffee.
Cold brew’s slow extraction is almost too honest — it highlights the natural sweetness and character in good beans, and it highlights the flaws in bad ones. A fruity, complex bean becomes more vibrant. A stale or low-quality bean becomes flat and murky.
What to Look For in Cold Brew Beans
- Naturally low-acid origins — Brazilian, Sumatran, and Guatemalan coffees tend to be naturally lower in acidity due to altitude and processing methods. These already-gentle beans become exceptionally smooth in cold brew.
- Medium to dark roast — Roasting reduces chlorogenic acid content. Medium roasts hit a sweet spot: enough body and sweetness for cold brew without the edge of a very light roast.
- Fresh roast date — Stale beans produce flat cold brew with no complexity. Look for roast dates within 2–6 weeks.
- Coarse grind available — If buying pre-ground, confirm it’s ground coarse for cold brew specifically.
- Mold-free and clean — Coffee naturally contains mold and mycotoxin risks from farming and storage. Cold brew doesn’t use heat to neutralize these. This matters more than most people realize. (More on mold-free coffee here.)
The Best Pangea Coffees for Cold Brew
Pangea Coffee is sourced from naturally low-acid growing regions (Brazil, Sumatra, Guatemala, and Mexico), small-batch roasted, and SPOKIN-verified Top-9 allergen-free — one of the first coffee brands in the country to achieve third-party allergen-free verification. That means your cold brew is as clean as the beans behind it.
☕ Unity Medium Roast — Best for Cold Brew
Unity is our top pick for cold brew. The medium roast profile extracts beautifully in cold water — bringing out notes of dark chocolate, brown sugar, and smooth nuttiness without any bitterness. The naturally low-acid Brazilian and Sumatran sourcing means you get deep, satisfying flavor at a 1:8 ratio without any of the acidic bite that can make cold brew feel harsh.
☕ Bold Respect No. 3 Dark Roast — Best for Cold Brew Concentrate
If you’re making concentrate or prefer an intensely rich cold brew, Bold Respect is built for it. The dark roast produces a deep, espresso-forward cold brew concentrate that holds up beautifully when diluted or used as a cold brew latte base. Lower perceived acidity than most dark roasts thanks to the mold-free sourcing and careful small-batch roasting.
☕ Hope Light Roast — Best for Bright Cold Brew
For a lighter, more nuanced cold brew with natural fruit-forward complexity, Hope Guatemala delivers. The longer steep time (18–24 hours recommended) coaxes out its delicate florals and stone-fruit character in a way that hot brewing often can’t achieve. A more advanced choice, but one of the most rewarding cold brews you’ll make at home.
☕ Sugarcane EA Decaf — Best for Caffeine-Free Cold Brew
Yes, you can make cold brew with decaf — and Pangea’s Sugarcane EA Decaf is the cleanest option for it. The natural ethyl acetate process (derived from sugarcane, not harsh chemical solvents) preserves the bean’s low-acid character and smooth body. Perfect for evening cold brew, for those sensitive to caffeine, or anyone who wants the ritual without the stimulant. Same allergen-free facility standards as all Pangea products.
Not sure where to start? The Flavor Discovery Pack lets you try Unity, Bold Respect, and Hope together — a great way to find your favorite before committing to a full bag for cold brew.
Cold Brew for Sensitive Stomachs & Acid Reflux
Cold brew has become something of a revelation for people who love coffee but whose digestive systems haven’t always agreed. The lower acidity is a big part of the equation — but it’s not the only variable worth understanding.
Why Cold Brew Is Gentler
The chlorogenic acids that form during hot brewing (and that trigger acid reflux and stomach discomfort in many people) are extracted in significantly lower amounts during cold brewing. Research by Rao and Fuller found that hot-brewed coffee consistently contains higher total titratable acid levels than cold brew from the same beans, while a 2020 study in Food Research International confirmed cold brew shows meaningfully lower acidity across all roast levels.
Starting with naturally low-acid beans compounds this effect. If you’re already working with coffee sourced from low-acid growing regions, your cold brew starts at a lower baseline acidity before extraction even begins. That combination — cold brew method plus low-acid beans — is as close to stomach-friendly coffee as you can get without switching to decaf entirely.
If you want a deeper breakdown of how cold brew fits into a GERD or acid reflux management plan, our cold brew acid reflux guide covers the full picture, including what the research says about caffeine, stomach acid, and the lower esophageal sphincter.
Cold Brew Tips for Gastritis or Ulcer Sufferers
- Use the 1:10 ratio (gentlest extraction) to further minimize acid load
- Steep for 12–16 hours max rather than 24 to avoid over-extraction
- Avoid drinking cold brew on an empty stomach
- Start with 4 oz portions rather than a full cup and monitor your response
- Consider the Sugarcane EA Decaf version if caffeine sensitivity is a factor
For those managing gastritis specifically, our low-acid coffee for gastritis guide dives deeper into what the research says about coffee and stomach lining health.
Troubleshooting Common Cold Brew Problems
My Cold Brew Tastes Bitter
Almost always a grind problem. Fine grinds over-extract in cold water over 12+ hours, pulling bitter tannins and compounds that a coarse grind would leave behind. Go coarser. Also check your steep time — 24 hours in a warm kitchen can push past the sweet spot.
My Cold Brew Tastes Weak or Flat
Two likely causes: not enough coffee (increase your ratio) or old beans (stale coffee loses volatile compounds that create complexity). Fresh roast date matters significantly in cold brew. Alternatively, extend your steep time toward 20–24 hours.
My Cold Brew Is Cloudy
Normal in most cases — fine coffee particles passing through the strainer. Double-strain through a paper coffee filter after the first pass for a cleaner, clearer result. Cold brew also naturally clarifies a bit after 24 hours in the fridge.
My Cold Brew Tastes Sour
Under-extraction. The sour notes come from early-stage acids that haven’t been balanced by the sweeter, deeper compounds that extract with more time. Steep longer (try 18–20 hours instead of 12) or grind slightly finer (not too fine — just a step or two toward medium-coarse).
Frequently Asked Questions About Cold Brew Coffee
What is the best ratio for cold brew coffee?
The most versatile starting ratio for ready-to-drink cold brew is 1:8 (coffee to water by weight). For a 32 oz batch, that’s 4 oz (113g) of coarsely ground coffee to 32 oz of cold water. If you want concentrate to dilute later, use 1:4 and cut 1:1 with water before serving. If you have a sensitive stomach, 1:10 is the gentlest option.
How long should cold brew steep?
12–24 hours in the refrigerator is the standard range. Most home brewers find 16–20 hours hits the best balance of flavor development and smoothness. Steeping at room temperature is faster but riskier — limit room-temp steeping to 12 hours maximum. Going beyond 24 hours rarely improves flavor and can push extraction past the point of pleasantness.
How long does cold brew last in the fridge?
Properly strained and stored cold brew stays fresh for 7–14 days in a sealed container in the refrigerator. Cold brew concentrate lasts toward the longer end of that range since it hasn’t been diluted. Flavor is typically best in the first 7 days. If it smells sour or off, discard it.
Is cold brew less acidic than hot coffee?
Yes. Research consistently shows cold brew has lower total acid content than hot-brewed coffee. A peer-reviewed 2018 study found that hot coffee extracts up to 50% more total titratable acid than cold brew from the same beans, though pH values between the two are actually quite similar. The real difference is in the total acid load — cold water simply doesn’t pull out as many acidic compounds during the long steep. This is why many people with acid reflux or sensitive stomachs find cold brew more tolerable. Starting with naturally low-acid beans amplifies this effect further.
What’s the difference between cold brew and iced coffee?
Iced coffee is brewed hot and served over ice — it retains the full acidity and bitterness of hot-brewed coffee and often tastes diluted as the ice melts. Cold brew is never heated — it’s brewed directly in cold water over 12–24 hours. The result is a naturally sweeter, smoother, less acidic coffee that doesn’t change as the ice melts because it’s already cold-concentrated.
Can I make cold brew with decaf coffee?
Absolutely. Decaf cold brew works beautifully — especially if you use a naturally processed decaf like Pangea’s Sugarcane EA Decaf. The ethyl acetate process preserves the bean’s natural flavor and low-acid profile, which means your decaf cold brew tastes like real cold brew — not like a watered-down alternative. Great for evenings or for those sensitive to caffeine.
Does cold brew have more caffeine than regular coffee?
Cold brew concentrate is significantly more caffeinated than regular drip coffee because of the higher coffee-to-water ratio used during brewing. Once diluted to a ready-to-drink strength (1:1 with water), the caffeine content is roughly comparable to hot-brewed coffee — sometimes slightly higher, depending on your ratio and bean type. If you’re sensitive to caffeine, either dilute generously or opt for decaf cold brew.
Is Pangea Coffee safe for food allergies when making cold brew?
Yes. Pangea Coffee is SPOKIN-verified Top-9 allergen-free — the FIRST coffee brand in the country to receive this third-party verification. Our facility processes no Top-9 allergens, which means your cold brew is as clean as your beans. If you have food allergies, be mindful of any additions (milks, syrups, flavorings) as those carry their own allergen considerations. Our allergen-free coffee guide covers this topic in full.
What grind size is best for cold brew?
Coarse grind — similar in texture to raw sugar or coarse sea salt. Fine grinds over-extract during the long steep, producing bitter, muddy results and making straining difficult. If your grinder has numbered settings, aim for the 8–10 range (out of 10). Most burr grinders have a specific cold brew or French press setting that works well.
What Our Customers Say
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“I have REALLY bad GERD and acid reflux. This unity roast does not bother me at all. I also have severe food allergies to nuts and shrimp and drink this safely.”
Alison K. — Verified Purchase
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“Delicious coffee that goes down easy. I have to be very careful with my stomach, and I am delighted that I can still drink this coffee.”
Drea — Verified Purchase
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“The Costa Rica Hope is so smooth and highlighted the notes are well rounded and very enjoyable cup of coffee.”
Daniel C. — Verified Purchase
Ready to Make the Best Cold Brew of Your Life?
Start with clean, naturally low-acid beans that make every step of the process better — from the pour to the first sip. SPOKIN-verified allergen-free. Doctor-backed. Same-day weekday shipping.
Shop Low-Acid Cold Brew Coffee →Related Guides
- Is Cold Brew Better for Acid Reflux and GERD? The Science Explained
- Best Coffee for Acid Reflux & GERD: Complete Doctor-Backed Guide
- Low Acid Coffee for Gastritis and Ulcers: A Healing Approach
- Decaf Coffee & Acid Reflux: Finding a Decaf That’s Actually Safe
- Why Mold-Free Coffee Matters: A Health-First Approach
Medical Disclaimer: This content is for informational purposes only and does not constitute medical advice. Cold brew and low-acid coffee may reduce digestive discomfort for some individuals, but individual responses vary. If you have acid reflux, GERD, gastritis, or any other digestive condition, please consult your physician or gastroenterologist before making changes to your diet or coffee consumption.
Scientific References
- Rao NZ, Fuller M. Acidity and Antioxidant Activity of Cold Brew Coffee. Scientific Reports. 2018.
- Fuller M, Rao NZ. Physiochemical Characteristics of Hot and Cold Brew Coffee Chemistry: The Effects of Roast Level and Brewing Temperature on Compound Extraction. Foods. 2017.
- Niseteo T, et al. Bioactive composition and antioxidant potential of different commonly consumed coffee brews affected by their preparation technique. Food Chemistry. 2012.
- Ohida S, et al. The Effects of Chlorogenic Acids on Coffee Acidity and Gastric Acid Secretion. Nutrients. 2019.
Quality Assurance: All Pangea Coffee is small-batch roasted and ships same day on weekdays. Our facility is SPOKIN-verified Top-9 allergen-free — one of the first coffee brands in the country to achieve this third-party verification. Q graders on our team evaluate coffee at our facility and sometimes at the source to ensure quality before every roast.
Last updated: April 2026
