How to use this calculator
Pick your brew method, choose how strong you want the coffee, and enter how much water you're brewing with. The calculator instantly shows you exactly how much ground coffee to use — both in grams (the accurate way) and in tablespoons (the convenient way).
The ratios built into this tool come from the brewing standards published by the Specialty Coffee Association, adjusted to match how most home brewers actually use these methods. Your taste may be different — that's the whole point of the strength selector.
Why ratio matters more than scoops
If you've been measuring coffee with a tablespoon scoop, you've probably noticed your coffee tastes different from one bag to the next. That's not the bag — it's the volume.
A tablespoon of coffee can weigh anywhere from 4 grams (oily dark roast, fine grind) to 7 grams (light roast, coarse grind). That's a 75% swing. So when a recipe says "two tablespoons per cup," that recipe is leaving a lot up to chance.
Weighing your coffee in grams takes the guesswork out. Once you find a ratio you love — say, 1:15 in your French press — you can hit that target every single brew, regardless of which beans you bought this week. A $15 kitchen scale is the single biggest upgrade most home coffee setups can make.
Common ratios by brew method
| Method | Ratio (mild) | Ratio (strong) | Notes |
|---|---|---|---|
| Pour Over (V60) | 1:17 | 1:15 | Medium-fine grind, 2:30–4:00 brew |
| French Press | 1:17 | 1:15 | Coarse grind, 4-minute steep |
| AeroPress | 1:17 | 1:13 | Medium-fine, 1–2 minute steep |
| Drip Coffee Maker | 1:18 | 1:15 | Medium grind, follow machine spec |
| Chemex | 1:17 | 1:16 | Medium-coarse, slow pour |
| Cold Brew (concentrate) | 1:8 | 1:5 | Steep 12–24 hours, dilute to taste |
| Cold Brew (ready) | 1:15 | 1:12 | Drink straight from steep |
| Moka Pot | 1:7 | 1:5 | Fine grind, fill basket level |
| Espresso | 1:2.5 | 1:1.5 | Very fine, 25–30 second extraction |
Tips for brewing better coffee at home
1. Grind right before you brew
Coffee starts losing flavor within minutes of being ground. A burr grinder is the second-best upgrade after a scale — it gives you consistent particle size, which is what makes good extraction possible.
2. Use filtered water
Coffee is 98% water. If your tap water tastes off, your coffee will too. A simple filter pitcher or in-fridge filter does the trick. Avoid distilled water — coffee actually needs some mineral content to extract properly.
3. Mind the temperature
Aim for water between 195°F and 205°F (90°C to 96°C). Boiling water (212°F) will scorch your grounds and pull bitter notes. Let your kettle sit off the heat for 30 seconds before pouring.
4. Adjust by taste, not by recipe
Recipes are starting points. If your coffee tastes sour, the extraction was too short — try a finer grind or longer brew. If it tastes bitter, you over-extracted — coarser grind or shorter brew. The strength selector in this calculator nudges your ratio in the right direction, but grind and time are equally powerful levers.
Frequently asked questions
What is the standard coffee-to-water ratio?
1:16 by weight is the most widely cited starting point — 1 gram of coffee per 16 grams of water. That comes from the Specialty Coffee Association's "Golden Cup" standard. Most home brewers find their personal sweet spot between 1:15 and 1:18.
How many tablespoons of coffee per cup?
Roughly 1 to 2 tablespoons per 6-ounce cup, depending on strength. For better consistency, weigh — about 10 to 12 grams of coffee per 6-ounce cup at a 1:15 ratio.
Why should I weigh my coffee instead of using scoops?
Coffee bean density varies a lot — by roast level, bean variety, and grind size. A scoop that gives you a perfect cup with one bag will give you weak coffee with another. Grams stay constant.
Does the ratio change for cold brew?
Yes. Cold brew uses much more coffee per unit of water because the extraction is slower and gentler. A typical cold brew concentrate runs 1:8 (which you dilute later with water or milk). Ready-to-drink cold brew is usually 1:15.
What's the best ratio for French press?
1:15 to 1:17 by weight. A reliable starting point: 60 grams of coffee per 1 liter of water, coarse grind, 4-minute steep, then plunge slowly.