Coffee & Espresso Brew Ratio Calculator
Calculate the exact grams of coffee beans and water needed for the perfect pour-over, French press, or espresso based on specialty coffee brew ratios.
Calcady™ · Official Calculation Report Coffee & Espresso Brew Ratio CalculatorApril 7, 2026 calcady.com Coffee & Espresso Brew Ratio CalculatorSpecialty coffee brewing uses mass-based ratios, not scoops. Get the exact grams of coffee and water for your brew method — guaranteed consistency every cup. 01 — Brew Settings Standard mug ≈ 240–350g · Travel mug ≈ 500g · Batch brew ≈ 1000g+ 02 — Your Brew Recipe 1 : 15Standard ☕ Coffee Beans 20 grams 💧 Water 300 grams Coffee : Water Ratio Visualization 6% 94% ☕ Coffee (20g)💧 Water (300g) Summary: To brew 300g of coffee at a 1 : 15 ratio, you need exactly 20g of ground coffee beans and 300g of water. Brew Method Reference Espresso1:1.5–293°C / 200°F25–30 sec9 bar pressure Cold Brew1:4–8Cold / Room12–24 hrsSteep & filter French Press1:12–1493°C / 200°F4 minCoarse grind Pour Over1:15–1793°C / 200°F3–4 minMedium grind AeroPress1:12–1680–90°C1–2 minFine-medium grind |
Quick Answer: How do coffee brew ratios work?
A coffee brew ratio is the grams of water per gram of ground coffee. The Specialty Coffee Association (SCA) defines the "Golden Cup" standard as a 1:15 to 1:18 ratio, targeting 18–22% extraction yield at 1.15–1.35% Total Dissolved Solids (TDS). Using grams instead of scoops eliminates the density variable — light roasts are denser than dark roasts by up to 20%, making "one scoop" a wildly inconsistent measurement.
Grind Size vs. Brew Method Quick Reference
Grind size and brew ratio work together — adjusting one without the other produces imbalanced extraction.
| Method | Ratio | Grind Size | Water Temp | Contact Time |
|---|---|---|---|---|
| Espresso | 1:1.5–2 | Extra Fine | 93°C / 200°F | 25–30 sec |
| AeroPress | 1:12–16 | Fine-Medium | 80–90°C | 1–2 min |
| Pour Over | 1:15–17 | Medium | 93°C / 200°F | 3–4 min |
| French Press | 1:12–14 | Coarse | 93°C / 200°F | 4 min |
| Cold Brew | 1:4–8 | Extra Coarse | Room Temp | 12–24 hrs |
Pro Tips & Common Mistakes
Do This
- ✓Weigh everything with a 0.1g scale. A kitchen scale accurate to 0.1g eliminates the biggest variable in home brewing. A scoop of light-roast holds up to 20% more coffee mass than the same scoop of dark-roast due to density differences after Maillard reaction expansion.
- ✓Bloom your pour-over with 2× the coffee weight in water. For 20g of coffee, pour 40g of water first and wait 30 seconds. This degassing step (releasing CO₂ from fresh-roasted beans) prevents channeling and ensures even extraction across the entire coffee bed.
Avoid This
- ✗Don't use boiling water on coffee. Water above 96°C (205°F) over-extracts and scalds the grounds, producing harsh bitter compounds. Let boiling water sit 30–60 seconds before pouring. Conversely, water below 90°C under-extracts even with the correct ratio, producing sour, thin coffee.
- ✗Don't pre-grind coffee and store it. Ground coffee begins losing volatile aromatic compounds within 15 minutes of grinding. Whole beans stay fresh for 2–4 weeks after roasting; ground coffee goes stale in 24–48 hours. Grind immediately before brewing for maximum flavor extraction.
Frequently Asked Questions
Why do specialty coffee shops use grams instead of tablespoons?
Because a tablespoon is a volume measurement, not mass. Light roasts are denser than dark roasts — one tablespoon of light roast can weigh 7g while the same tablespoon of dark roast weighs only 5.5g. That 27% difference completely changes extraction. Using a gram scale eliminates this variable and produces perfectly repeatable results every single time.
What is the difference between brew ratio and extraction yield?
Brew ratio is the input recipe — how much coffee vs. water you use (e.g., 1:15). Extraction yield is the output measurement — the percentage of the coffee's mass that dissolved into the water (target: 18–22%). A refractometer measures Total Dissolved Solids (TDS) in the brewed cup, and extraction yield is calculated as (TDS × beverage weight) / coffee dose × 100. You can hit the same extraction yield with different ratios by adjusting grind size, temperature, and contact time.
Why does cold brew use such a concentrated ratio (1:4-8)?
Cold water extracts coffee compounds much more slowly than hot water — roughly 60% less efficiently. To compensate, cold brew uses a much higher coffee-to-water ratio and much longer contact time (12–24 hours). The result is a concentrated extract that is typically diluted 1:1 with water or milk before serving. This produces a low-acid, smooth, naturally sweet cup because cold water preferentially extracts sugars and caffeine while leaving behind many of the bitter chlorogenic acids that hot water dissolves readily.