The complete guide to coffee-to-water ratio
Ratio is the single most important variable in a consistent cup. Get it right and everything else — grind, time, temperature — becomes fine-tuning.
Last updated February 2026
What a coffee ratio actually means
A coffee-to-water ratio compares the weight of ground coffee to the weight of water. Written as 1:16, it means one gram of coffee for every sixteen grams of water. Because a milliliter of water weighs almost exactly one gram, you can read the water side as either grams or milliliters — 320 g of water is 320 ml.
Working by weight instead of scoops removes the biggest source of inconsistency. Beans differ in density by roast and origin, so a “scoop” can swing by several grams. A ten-dollar kitchen scale is the most reliable upgrade you can make.
Common ratios by method
Each brewing method has a practical starting ratio. These are launch points, not rules — adjust to your taste and equipment.
| Method | Balanced ratio | Grind | Brew time |
|---|---|---|---|
| Pour Over | 1:16 | Medium-fine | ~3:00–3:30 |
| French Press | 1:15 | Coarse | ~4:00 |
| AeroPress | 1:15 | Medium-fine | ~1:30–2:00 |
| Drip Coffee | 1:16 | Medium | ~4:00–6:00 |
| Chemex | 1:16 | Medium-coarse | ~4:00–4:30 |
| Cold Brew | 1:5 | Extra coarse | 12–18 hours |
Stronger or lighter?
- Lower ratio (more coffee), e.g. 1:15: bolder, heavier body, more intensity.
- Higher ratio (less coffee), e.g. 1:17: brighter, cleaner, more delicate.
- Adjust in single steps. Moving from 1:16 to 1:15 is a clearly noticeable change.
Ratio vs. extraction
Ratio sets how much coffee ends up in the cup; extraction sets how much flavor you pull from that coffee. If a brew tastes weak even at a strong ratio, the fix is usually a finer grind or longer contact time, not more coffee. Change one variable at a time so you can tell what did what.
Putting it together
Start at the balanced ratio for your method, brew it twice the same way, then adjust a single point of ratio toward the profile you want. Use the ratio calculator to scale the recipe to any batch size without losing the balance.