Perfect coffee-to-water ratios for every brew method
Brewing great coffee consistently comes down to one fundamental relationship: the ratio of coffee to water. Get that right and you can reproduce a perfect cup every morning, regardless of which brew method you use. This calculator handles the math for you — select your brewing method, enter how much water you're using, and adjust the strength slider to match your taste. You'll get the exact grams of coffee, grind size, brew time, and water temperature in real time.
The Specialty Coffee Association recommends a starting ratio of 1:18 (1 gram of coffee for every 18 grams of water), but most home brewers prefer something richer — between 1:15 and 1:17. Espresso is a different animal entirely, running at 1:2 or 1:3. Cold brew concentrates can go as tight as 1:5. Every method has its own sweet spot, and this tool gives you the range for each one with a strength slider so you can dial it in without doing arithmetic at 6 AM.
Free, fast, and private — no sign-up, no data collection, nothing leaves your browser. Pick your method below and start brewing.
Using the CoffeeRatio calculator is straightforward, but here's a step-by-step walkthrough to get the most out of it:
Here's a quick-reference breakdown of the default balanced ratios for every method the calculator supports. Use this as a cheat sheet — but remember, the calculator gives you exact grams for any water amount, so you don't have to memorize these.
| Brew Method | Strong | Balanced | Mild | Grind | Brew Time |
|---|---|---|---|---|---|
| French Press | 1:12 | 1:15 | 1:18 | Coarse | 4 min |
| Pour Over | 1:15 | 1:16 | 1:17 | Medium-Fine | 3–4 min |
| AeroPress | 1:10 | 1:14 | 1:16 | Fine-Medium | 1–2 min |
| Chemex | 1:15 | 1:16 | 1:17 | Medium-Coarse | 4–6 min |
| Moka Pot | 1:7 | 1:10 | 1:12 | Fine | 5–8 min |
| Cold Brew | 1:4 | 1:5 | 1:8 | Coarse | 12–24 hr |
| Espresso | 1:1 | 1:2 | 1:3 | Extra Fine | 25–30 sec |
| Turkish | 1:10 | 1:12 | 1:14 | Powder-Fine | 3–5 min |
| Drip | 1:15 | 1:16 | 1:17 | Medium | 4–6 min |
Notice how espresso and cold brew sit at opposite ends of the ratio spectrum. Espresso uses a 1:2 ratio because it's brewed under 9 bars of pressure in 25 seconds — the tight ratio and fine grind create a concentrated shot with a thick crema. Cold brew uses 1:5 because it steeps for 12–24 hours with no pressure or heat; the long contact time extracts flavor slowly, so you need more coffee relative to water to get a flavorful result. Drip, pour over, and Chemex cluster around 1:16 because they're all gravity-fed percolation methods with similar brew times.
The Specialty Coffee Association recommends 1:18 as a starting point (1 gram coffee to 18 grams water). Most home brewers prefer 1:15 to 1:17 for a richer, more flavorful cup. The "golden ratio" is a guideline — the best ratio is the one that tastes right to you.
For a standard 8 oz (236 ml) cup, use about 14–16g of coffee at a 1:15 to 1:17 ratio. For a 12 oz travel mug, that's roughly 21–24g. Our calculator handles the math for any cup size.
Bitter coffee is usually over-extracted — try a coarser grind or shorter brew time. Sour coffee is under-extracted — try a finer grind or longer brew time. Water temperature also matters: too hot extracts bitter compounds, too cool leaves coffee sour and weak.
Use the same ratio. Decaf beans are slightly less dense, so you may need a marginally finer grind, but the water-to-coffee ratio stays the same.
Weighing with a scale is far more accurate. A tablespoon of light roast weighs about 5g, while a dark roast can be 7g — that's a 40% difference. A $15 kitchen scale is the single best upgrade for better coffee.
Ideal brewing temperature is 90–96°C (195–205°F). Boiling water burns coffee. Let your kettle rest 30–60 seconds after boiling before pouring. For AeroPress, try slightly cooler water (85°C / 185°F).
Keep the ratio the same and multiply. If 20g coffee + 320ml water makes one cup (1:16), then 60g + 960ml makes three cups. Our calculator does this automatically — just change the water amount.
Dark roasts are less dense, so the same weight takes up more volume. If you switch from light to dark, you might need slightly more coffee by weight to match the strength. Start with the same ratio and adjust to taste.
Everything you need to know about brewing great coffee at home — ratios, grind, water temperature, technique tips, and troubleshooting for every method.
Read guide →The science behind coffee ratios: the SCA golden ratio, extraction yield, how roast level changes your ratio, and why stronger doesn't mean better.
Read guide →Why grind size is the most important variable in coffee brewing. Visual analogies for every method, burr vs blade grinders, and troubleshooting bitter or sour shots.
Read guide →Start with a 1:15 ratio (1g coffee per 15ml water). Use coarsely ground coffee — it should look like sea salt. Add water at 93°C (200°F), stir gently, and steep for 4 minutes. Press slowly and serve immediately. Don't let it sit — it will over-extract and turn bitter. For a stronger cup, try 1:12. For lighter, try 1:18.
A 1:16 ratio is the sweet spot for pour over. Use medium-fine grind — slightly finer than table salt. Bloom the coffee with 2–3x its weight in water, wait 30 seconds, then pour in slow, concentric circles. Total brew time: 3–4 minutes. The slower pour extracts more nuanced flavors and produces a cleaner cup than French press.
AeroPress is the most versatile brewer — ratios range from 1:10 (concentrated) to 1:16 (standard). For a classic cup, use 1:14 with fine-to-medium grind and 85°C (185°F) water. Steep for 1–2 minutes, then press slowly for 20–30 seconds. Inverted method gives more control over steep time. Easy to clean up and perfect for travel.
Chemex uses the same 1:16 ratio as pour over but with medium-coarse grind and thicker filters that produce an ultra-clean cup. Bloom for 30 seconds, then pour in a spiral pattern. Total brew time: 4–6 minutes. The thick filters remove oils and sediment, giving Chemex its signature bright, tea-like clarity. Great for highlighting fruity or floral beans.
Cold brew uses a much tighter ratio: 1:5 for a concentrate, or 1:8 for ready-to-drink. Use coarsely ground coffee and cold or room temperature water. Steep 12–24 hours in the fridge, then strain through a fine mesh or paper filter. Dilute concentrate 1:1 with water or milk. Cold brew is 67% less acidic than hot brew, making it smoother and easier on the stomach.
Espresso uses the tightest ratio: 1:2 to 1:3 (that's 18g coffee for a 36–54ml double shot). Use extra-fine grind — like powdered sugar. Tamp evenly with 15–25 lbs of pressure. Extract for 25–30 seconds at 9 bars of pressure. A good shot has a thick golden crema and tastes sweet, not bitter. If it runs fast and tastes sour, grind finer. If it drips slowly and tastes harsh, grind coarser.
Turkish coffee uses a 1:10 to 1:14 ratio — much stronger than drip. Grind beans to a powder-fine consistency (finer than espresso). Add coffee and cold water to a cezve (ibrik), stir once, and heat slowly on low. Don't stir after heating begins. When foam rises to the brim (just before boiling), remove from heat. Let grounds settle for 1–2 minutes before serving. Traditionally served unsweetened, slightly sweet (1 tsp sugar), or very sweet (2 tsp). No filter — grounds stay in the cup.
Drip coffee works best at 1:15 to 1:17 ratio. Use medium grind — similar to table salt. If using a paper filter, rinse it first with hot water to remove papery taste. Add water to the reservoir and let the machine do the work. For better results, use water at 93°C (200°F) — some machines run too cool. A 12-cup machine uses about 60g of coffee for a full pot. Clean your machine monthly with a descaling solution to keep it brewing at the right temperature.