The standard cold brew ratio is 1:8 — 1 gram of coffee for every 8 grams of water. For cold brew concentrate (which you dilute before drinking), use a stronger 1:4 ratio. A 1-liter batch at 1:8 uses 125g of coarsely ground coffee; a concentrate batch at 1:4 uses 250g.
Cold Brew Ratio Quick Reference
| Style | Coffee | Water | Ratio | Serve As |
|---|---|---|---|---|
| Regular strength | 125g | 1000g (1L) | 1:8 | Drink straight over ice |
| Regular strength | 63g | 500g (500ml) | 1:8 | Half batch |
| Concentrate | 250g | 1000g (1L) | 1:4 | Dilute 1:1 with water or milk |
| Concentrate (medium) | 167g | 1000g (1L) | 1:6 | Dilute 1:0.5 (2 parts cold brew, 1 part water) |
All weights in grams. Measure by weight for consistency.
Regular Strength vs. Concentrate: Which Ratio to Use
Regular strength (1:8): Brew it, pour it over ice, drink it. No dilution needed. This is the simplest approach and works well for drinking at home. Slightly more forgiving if your steep time is off.
Concentrate (1:4): Brew a dense extract, then dilute to taste before drinking. Advantages:
- Takes up less fridge space (half the volume for the same servings)
- Highly customizable — dilute with water, milk, oat milk, or sparkling water
- Lasts longer in the fridge because higher concentration inhibits oxidation
- Standard for cold brew sold commercially
Which to choose: If you’re making cold brew for yourself and want simplicity, go 1:8. If you’re batch-brewing for a week or want to make lattes and cocktails, go 1:4 concentrate.
Batch Size Calculator
For regular cold brew at 1:8:
- 2 servings (16oz / 500ml total): 63g coffee, 500g water
- 4 servings (32oz / 1L): 125g coffee, 1000g water
- 8 servings (64oz / 2L): 250g coffee, 2000g water
For concentrate at 1:4 (makes double the final drinks after dilution):
- 4 servings worth (final): 125g coffee, 500g water → yields 500ml concentrate → 1L after diluting 1:1
- 8 servings worth (final): 250g coffee, 1000g water → yields 1L concentrate → 2L after diluting 1:1
Steep Time: How Long to Brew Cold Brew
Steep time and ratio work together — a stronger ratio benefits from slightly less steep time to avoid over-extraction:
| Ratio | Fridge Steep (cold) | Room Temp Steep | Result |
|---|---|---|---|
| 1:8 (regular) | 12–16 hours | 8–12 hours | Balanced, smooth |
| 1:6 (medium concentrate) | 14–18 hours | 10–14 hours | Rich, strong |
| 1:4 (concentrate) | 18–24 hours | 12–18 hours | Dense, bold, slightly bitter |
Standard recommendation: 12–16 hours in the refrigerator at 1:8. Most home brewers find overnight (12 hours) in the fridge hits the sweet spot.
Fridge vs. room temperature: Fridge-brewed cold brew is slower but produces a cleaner, smoother result. Room temperature brewing is faster but can produce a slightly more acidic, earthy flavor. Both work — fridge is preferred for flavor.
Grind Size for Cold Brew
Cold brew uses coarse grounds because the long steep time compensates for lower extraction efficiency. Fine grounds over-extract quickly even in cold water, producing bitterness and making straining difficult.
- Too fine: Bitter, difficult to filter, gritty texture in the final cup
- Too coarse: Weak, thin, under-extracted — tastes watery even at the right ratio
- Right: Same as French press — coarse and uniform, like sea salt or breadcrumbs
Use a consistent grind. Uneven grounds (some fine, some coarse) extract unevenly — the fines over-extract while the coarse pieces under-extract.
How to Make Cold Brew (Step by Step)
Equipment: Large jar or pitcher, coffee filter or fine-mesh strainer, scale
- Measure coffee: 125g coarsely ground coffee per 1L water (1:8 ratio)
- Combine: Add grounds to jar, pour cold filtered water over them
- Stir briefly to ensure all grounds are saturated
- Cover the jar (lid, plastic wrap, or plate)
- Steep: 12–16 hours in the refrigerator
- Strain: Pour through a fine-mesh strainer lined with a coffee filter, cheesecloth, or paper filter. This step takes 5–15 minutes — don’t rush it.
- Store: Keep strained cold brew in the fridge in a sealed container
Shelf life: Regular strength lasts 7–10 days. Concentrate lasts 10–14 days. Store in a sealed glass container for best flavor.
Cold Brew vs. Iced Coffee: Different Drinks, Different Ratios
Cold brew and iced coffee are not the same thing:
| Cold Brew | Iced Coffee | |
|---|---|---|
| Brewing temperature | Cold water (4°C / 40°F) | Hot espresso or drip |
| Brew time | 12–24 hours | Minutes |
| Ratio | 1:4–1:8 | 1:2 (espresso) or 1:15 (drip) |
| Acidity | Low | Higher |
| Flavor | Smooth, chocolatey, low acid | Bright, more bitter |
| Caffeine | High (longer contact time) | Standard |
Cold brew isn’t just “coffee served cold” — it’s a distinct brewing method. The long cold steep produces different chemistry, notably lower acidity and a sweeter, smoother flavor profile.
For iced espresso drinks, see our iced latte recipe — a completely different approach using espresso as the base.
Adjusting Your Cold Brew Ratio
Tastes too weak or watery:
- Increase coffee dose — try 1:7 (143g coffee per 1L)
- Or steep 2–4 hours longer
- Check your grind isn’t too coarse
Tastes too strong or bitter:
- Reduce coffee — try 1:9 (111g coffee per 1L)
- Or steep 2 hours less
- If making concentrate, dilute with more water before drinking
Flavor is flat and earthy:
- You may have steeped too long — try 10–12 hours instead of 16+
- Use filtered water — tap water chlorine affects cold brew flavor significantly
- Try a slightly lighter roast — dark roasts can turn muddy over long steep times
Inconsistent results batch to batch:
- Weigh coffee and water (don’t measure by volume)
- Use a timer rather than guessing steep time
- Grind fresh before each batch
Cold Brew Concentrate Dilution Guide
If you brewed concentrate at 1:4, here’s how to serve it:
| Drink | Concentrate | Dilute With |
|---|---|---|
| Standard cold brew | 120ml (4oz) | 120ml water |
| Cold brew latte | 90ml (3oz) | 150ml milk or oat milk |
| Cold brew tonic | 90ml (3oz) | 120ml tonic water |
| Iced americano-style | 60ml (2oz) | 180ml cold water |
Adjust ratios to taste. Concentrate is intentionally flexible — that’s the point.
Cold Brew Ratio vs. Other Methods
For reference, here’s how cold brew compares to other brewing methods in terms of coffee-to-water ratio:
| Method | Ratio | Strength | Brew Time |
|---|---|---|---|
| Cold Brew (regular) | 1:8 | Medium-strong | 12–16 hours |
| Cold Brew (concentrate) | 1:4 | Very strong | 18–24 hours |
| French Press | 1:15 | Medium-full | 4 minutes |
| Pour Over | 1:15–1:17 | Medium | 2.5–4 minutes |
| Espresso | 1:2 | Very concentrated | 25–35 seconds |
| Moka Pot | 1:7 | Concentrated | 4–5 minutes |
See the complete breakdown in our coffee to water ratio guide.
FAQ
What is the best cold brew ratio? 1:8 for regular cold brew you drink straight over ice. 1:4 for concentrate you dilute before serving. Both produce excellent cold brew — the choice depends on how you plan to serve it.
How long should I steep cold brew? 12–16 hours in the refrigerator at a 1:8 ratio. Overnight steeping (about 12 hours) is the most practical approach for most home brewers.
Can I use the same grounds as regular coffee? Yes, but grind coarser than you would for drip or pour over. Cold brew needs coarse grounds (sea-salt texture) to avoid over-extraction during the long steep.
How much coffee for 1 liter of cold brew? At 1:8: 125 grams of coarsely ground coffee. At 1:4 concentrate: 250 grams.
Does cold brew have more caffeine than regular coffee? Often yes — the longer steep time and higher coffee-to-water ratio in concentrate versions extract more caffeine. A serving of cold brew concentrate (before dilution) can have significantly more caffeine than a regular cup of drip coffee. After diluting 1:1, it’s roughly comparable.
Why is my cold brew bitter? Most likely causes: too fine a grind, steep time too long (16+ hours at room temp), or water too warm. Try steeping in the fridge with coarser grounds for a shorter time.
For all brewing method ratios in one place, see our coffee to water ratio guide. For French press specifically, see our French press ratio guide.