One of the simplest ways to improve your coffee immediately is to stop guessing how much coffee and water to use. The golden ratio gives you a reliable starting point for any brew method.
The Golden Ratio: 1:15 to 1:17
For every 1 gram of coffee, use 15–17 grams of water. This ratio works across French press, pour-over, AeroPress, drip coffee makers, and most other brew methods.
In practice: 15g coffee to 225g water is a good starting point for a single cup. Scale up proportionally for more.
Why Weight and Not Volume?
A tablespoon of coffee can weigh anywhere from 5g to 10g depending on grind size and how you scoop it. Measuring by weight eliminates that variable entirely. A kitchen scale costing €10 makes your coffee immediately more consistent.
Adjusting Strength
The ratio controls strength. Moving the ratio changes how much coffee you extract per cup of water:
- 1:12–1:14 (stronger): More concentrated, bolder, heavier body. Works well for milk-based drinks.
- 1:15–1:17 (standard): Balanced, works for most palates and brewing methods.
- 1:18–1:20 (lighter): More delicate, good for showcasing subtle flavour notes in high-quality light roasts.
One Ratio Rule to Remember
Start at 1:15. If it tastes too strong, add more water (moving toward 1:17). If it tastes too weak, use less water or more coffee. Make one change at a time so you know what made the difference.
Don't adjust the ratio to fix sourness or bitterness — those are extraction issues, not strength issues. Sour coffee needs a finer grind or hotter water. Bitter coffee needs coarser grind or cooler water. Weak or strong coffee is a ratio issue.