Coffee Ratio Calculator
Work out how much coffee and water to use for pour-over, french press, drip, espresso, cold brew, or AeroPress, with editable ratios and grind hints.
Processed locally in your browser — nothing is uploaded.
Coffee Ratio Calculator
Default for pour-over is 1:16.7. Edit to taste.
Enter an amount to see the coffee-to-water breakdown.
About Coffee Ratio Calculator
Pick a brew method and enter either your coffee dose or your water amount — the calculator solves for the other side using that method's typical ratio. The ratio itself stays editable, so once you know you like your pour-over a touch stronger than 1:16.7, you can dial it in and keep it.
Each method also shows a grind-size hint, because the right ratio with the wrong grind still brews a disappointing cup.
Common uses
- Scale a pour-over recipe from one cup to a full carafe
- Find the right dose for a french press you've never measured
- Convert a cold brew concentrate recipe to a different jar size
Example
Input
Pour-over · 340 g water · ratio 1:16.7
Output
20.4 g coffee, medium-fine grind
Limitations
- Ratios are starting points, not rules — roast level, grind, and taste all justify adjusting.
- Cup presets assume a 240 ml cup; espresso ratios describe beverage weight out, not tank water.
Frequently asked questions
What does a 1:16 coffee ratio mean?
It means 16 grams of water for every 1 gram of ground coffee. The calculator's defaults follow that convention: 1:16.7 for pour-over, 1:15 for french press, 1:17 for drip, and 1:8 for cold brew concentrate.
How much coffee do I need for one cup?
About 14 grams for a 240 ml cup at the pour-over default of 1:16.7 — the cup preset buttons assume 240 ml per cup. A stronger french press ratio of 1:15 puts the same cup at 16 grams.
Why measure brewing water in grams instead of milliliters?
Water weighs 1 gram per milliliter, so the two are interchangeable — the calculator shows both. Weighing everything on one scale is more repeatable than volume scoops, because ground coffee's density changes with roast and grind.
Why is the espresso ratio so much lower than the others?
The 1:2 espresso ratio describes beverage weight out relative to the dry dose — an 18 g dose yielding a 36 g shot — not the water in the machine's tank. Filter methods like pour-over measure the total water you pour, which is why they sit near 1:15 to 1:17.
Does this calculator send my brewing numbers to a server?
No. The ratio math runs entirely in your browser with JavaScript; nothing you enter is transmitted or stored anywhere.