Your coffee ratio - the amount of coffee relative to water - is the single biggest lever you have over how your cup tastes. Get it right, and even average beans can produce a solid brew. Get it wrong, and the best specialty roast will taste flat or bitter. This guide covers the recommended ratios for every major brew method, with real numbers you can use right now.
What is a coffee ratio?
A coffee ratio tells you how much coffee to use for a given amount of water, expressed as 1:X. So 1:15 means 1 gram of coffee for every 15 grams of water. Lower numbers (1:12) make a stronger cup; higher numbers (1:18) make a lighter one.
Always measure by weight, not volume. A tablespoon of finely ground coffee weighs more than a tablespoon of coarsely ground coffee, so scoops are unreliable. A simple kitchen scale (accurate to 0.1g) costs under $15 and will do more for your coffee than any other single upgrade.
The Specialty Coffee Association (SCA) recommends a range of 1:15 to 1:18 for brewed coffee, with 1:16.7 often cited as the "golden ratio." That said, the right ratio depends on your brew method, your beans, and your taste. Use the SCA range as a starting point, not a rule.
Ratios by brew method
Pour over (V60, Chemex, Kalita Wave)
Ratio: 1:15 to 1:17 Grind: Medium-fine Brew time: 2:30 to 4:00
Pour over methods reward precision. A 1:15 ratio will give you a richer, more concentrated cup, while 1:17 brings out more delicate, tea-like qualities. Most people land on 1:16 as their daily driver.
Example: For a single cup on a V60, use 15g coffee and 250ml water (roughly 1:16.7). For a Chemex serving two, go with 30g coffee and 480ml water (1:16).
Check out our V60 brew guide or Chemex brew guide for step-by-step instructions. You can also plug in your numbers on the pour over calculator.
French press
Ratio: 1:14 to 1:15 Grind: Coarse Brew time: 4:00
French press uses a slightly tighter ratio than pour over because the metal mesh filter lets more oils and body through. A 1:15 ratio is a safe starting point. If you like it thick and punchy, drop to 1:14.
Example: For a standard 3-cup French press, use 30g coffee and 450ml water (1:15). Let it steep for 4 minutes, then press slowly.
Try the French press calculator to scale the recipe to your press size.
AeroPress
Ratio: 1:12 to 1:16 Grind: Fine to medium
The AeroPress is the Swiss army knife of coffee brewing. Its wide ratio range reflects how versatile it is. A 1:12 ratio with fine grind produces something concentrated, almost espresso-like. A 1:16 ratio with medium grind makes a clean filter-style cup.
Example: For a standard recipe, use 15g coffee and 200ml water (about 1:13). For the inverted method with a longer steep, try 14g coffee and 220ml water (about 1:16).
Our AeroPress brew guide walks through both methods.
Espresso
Ratio: 1:1.5 to 1:3 (by weight of liquid out, not water in) Grind: Very fine Brew time: 25 to 35 seconds
Espresso ratios work differently from filter coffee. Here the ratio refers to the weight of ground coffee in the portafilter versus the weight of liquid espresso in the cup. The standard is 1:2 - so 18g of grounds should yield about 36g of espresso.
Example: Dose 18g into your portafilter and aim for 36g of liquid out in about 28 seconds. A 1:1.5 pull (27g out) will be a ristretto - short and intense. A 1:3 pull (54g out) gives a lungo - longer and more diluted.
Use the espresso calculator to dial in your dose and yield.
Cold brew concentrate
Ratio: 1:4 to 1:6 Grind: Very coarse Brew time: 12 to 18 hours
Cold brew concentrate is meant to be diluted before drinking. The tight ratio produces a strong base you can cut with water, milk, or ice to taste. A 1:5 ratio is a solid middle ground.
Example: Combine 100g coarsely ground coffee with 500ml cold water (1:5). Steep in the fridge for 14 to 16 hours, then strain. Dilute 1:1 with water or milk when serving.
Cold brew ready-to-drink
Ratio: 1:8 to 1:15 Grind: Very coarse Brew time: 12 to 18 hours
If you want cold brew you can pour straight from the jar without diluting, use a wider ratio. A 1:12 ratio produces a smooth, drinkable cup right out of the fridge.
Example: Use 50g coffee and 600ml water (1:12). Steep for 14 to 16 hours, strain, and drink as-is over ice.
The cold brew calculator handles the math for both concentrate and ready-to-drink batches.
Quick reference table
| Method | Ratio | Coffee | Water | Grind |
|---|---|---|---|---|
| Pour over (V60) | 1:16 | 15g | 250ml | Medium-fine |
| Pour over (Chemex) | 1:16 | 30g | 480ml | Medium-coarse |
| French press | 1:15 | 30g | 450ml | Coarse |
| AeroPress | 1:13 | 15g | 200ml | Fine to medium |
| Espresso | 1:2 | 18g | 36g out | Very fine |
| Cold brew (concentrate) | 1:5 | 100g | 500ml | Very coarse |
| Cold brew (ready-to-drink) | 1:12 | 50g | 600ml | Very coarse |
For quick calculations on any method, use the ratio calculator.
How to dial in your ratio
Start with the recommended ratio for your method, brew a cup, and taste it. Then adjust:
- Too weak or watery? Lower the ratio (e.g., go from 1:16 to 1:15). This means more coffee relative to water.
- Too strong or bitter? Raise the ratio (e.g., go from 1:15 to 1:16). This means less coffee relative to water.
- Sour or underextracted? The ratio might be fine, but your grind could be too coarse or your water too cool. Try grinding finer before changing the ratio.
- Bitter or overextracted? Again, check grind size (go coarser) and water temperature (try slightly cooler) before adjusting the ratio.
Ratio is just one variable in the extraction equation. Grind size, water temperature, brew time, and agitation all interact with each other. Change one thing at a time so you know what made the difference.
Grams to cups and tablespoons
Not everyone has a scale (though you really should get one). Here are some rough conversions to get you started:
- 1 level tablespoon of ground coffee is roughly 5 to 6 grams
- 1 standard US cup of water = 236ml (about 8oz)
- A typical mug holds about 350ml (12oz)
So for a 12oz mug at a 1:15 ratio, you need about 23g of coffee - that's roughly 4 tablespoons. For a standard 8oz cup at 1:16, you need about 15g or 2.5 to 3 tablespoons.
These are approximations. Different roast levels, origins, and grind sizes will change how much a tablespoon weighs. If you care about consistency, a $10 to $15 digital scale is the best investment you can make. Once you start weighing, you will never go back to scooping.
What to do next
Pick your brew method, grab the recommended ratio from the table above, and brew a cup. Taste it, adjust, repeat. That's really all there is to it.
If you want to go deeper, check out our brew guides for step-by-step instructions on specific methods, or use the brew timer to nail your timing alongside your ratio.