How It Works
Every brewing method has a golden ratio — the weight of coffee grounds to the weight of water. The standard starting point is 1:16, meaning 1 gram of coffee for every 16 grams of water. This calculator applies that ratio to your specific brew method and adjusts for your preferred strength.
Stronger coffee uses more grounds per unit of water (lower ratio like 1:12). Lighter coffee uses fewer grounds (higher ratio like 1:17). The calculator handles the math so you get consistent results every morning.
Coffee Ratios by Brewing Method
| Method | Ratio | Grind | Brew Time | Water Temp |
|---|---|---|---|---|
| Drip / Pour Over | 1:15 – 1:17 | Medium | 3-4 min | 195-205°F |
| French Press | 1:13 – 1:16 | Coarse | 4 min | 200°F |
| AeroPress | 1:10 – 1:14 | Fine-medium | 1-2 min | 175-205°F |
| Cold Brew (concentrate) | 1:4 – 1:6 | Extra coarse | 12-24 hr | Room/cold |
| Cold Brew (ready-to-drink) | 1:6 – 1:10 | Extra coarse | 12-24 hr | Room/cold |
| Espresso | 1:1.5 – 1:2.5 | Very fine | 25-30 sec | 200°F |
| Chemex | 1:15 – 1:17 | Medium-coarse | 4-5 min | 195-205°F |
| Moka Pot | 1:6 – 1:9 | Fine | 4-5 min | Stovetop |
How to Measure Coffee Without a Scale
A kitchen scale is the most accurate way to measure coffee, but not everyone has one. Here is a quick tablespoon-to-grams conversion:
- 1 level tablespoon of ground coffee = approximately 5 grams
- 1 heaping tablespoon = approximately 7-8 grams
- 1 standard coffee scoop = 2 tablespoons = 10 grams
For a single 8 oz mug of drip coffee at medium strength, you need about 15 grams — that is 3 level tablespoons or 1.5 coffee scoops. These numbers are approximate because grind size and density vary between beans.
FAQ
What is the golden ratio for coffee?
The golden ratio is 1:16 — 1 gram of coffee to 16 grams (milliliters) of water. The Specialty Coffee Association (SCA) recommends a range of 1:15 to 1:18. Start at 1:16 and adjust from there based on taste.
How much coffee do I need for 12 cups?
It depends on your cup size and brew method. For standard 6 oz cups with drip coffee at medium strength (1:16): 12 cups = 72 oz = 2,130 ml of water, which needs about 133 grams (roughly 27 tablespoons) of ground coffee. Use the calculator above with your exact cup size for a precise answer.
Does water temperature matter?
Yes. Water between 195-205°F (90-96°C) extracts coffee properly. Below 195°F and you get sour, under-extracted coffee. Above 205°F and you risk bitter, over-extracted coffee. If you do not have a thermometer, bring water to a boil and let it sit for 30-45 seconds before pouring.
Fresh ground vs pre-ground — does it matter?
Fresh ground coffee tastes better because aromatic compounds start degrading within 15 minutes of grinding. Pre-ground is convenient and still makes good coffee, but if you want to improve your brew without changing anything else, grinding right before brewing is the single biggest upgrade you can make.
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