100% Free • Specialty Coffee Brew Ratio & Dialing Engine
Coffee Ratio Calculator
Calculate and fine-tune coffee-to-water brew ratios (1:12 to 1:18), solve for dose or water mass, estimate TDS% and extraction yield, and generate multi-phase pour-over bloom and brew schedules.
Specialty Ratio Presets:Tap to load
Ratio Solver & Extraction Variables
Select your known variable, brewing apparatus, and roast profile.
A coffee brew ratio represents the fundamental mass proportionality between roasted ground coffee (\(C\)) and brewing water (\(W\)). In specialty coffee terminology, it is expressed as \(1:X\), where \(1\,\text{g}\) of coffee extracts into \(X\,\text{g}\) of water.
The Governing Conservation Formulas:
Find Coffee Dose (g):
\(C = \frac{W}{X}\)
Find Water Mass (g):
\(W = C \times X\)
Find Active Ratio (1:X):
\(X = \frac{W}{C}\)
The SCA Ratio Spectrum & Sensory Flavor Profiles
1:12 to 1:13 • Heavy Body
Intense, syrupy mouthfeel with pronounced cocoa notes. Ideal for French Press, Moka Pot, and dark roasts with milk.
1:14 to 1:15 • Sweet & Rich
Accentuates caramel, toffee, and fruit sweetness with medium-high body. Great for Kalita Wave and Aeropress.
1:16 • Golden Standard
The universal specialty coffee benchmark. Delivers peak balance between vibrant acidity, sweetness, and clean finish.
1:17 to 1:18 • High Clarity
Light, crisp, and tea-like with maximum terroir separation. Perfect for washed Ethiopian, Kenyan, and Geisha varietals.
Master Coffee Ratio Calibration Matrix: 8 Methods Compared
Specialty Standards
Method
Optimal Ratio
Coffee Dose (g)
Water Mass (g)
Target TDS %
Pour Over (V60)
1:16
30.0 g
480 g
1.25% – 1.40%
Chemex
1:15 to 1:16
40.0 g
600 g
1.30% – 1.45%
French Press
1:14
35.0 g
490 g
1.40% – 1.60%
AeroPress Standard
1:13
16.0 g
208 g
1.45% – 1.70%
Espresso (Double)
1:2
18.0 g
36 g (Liquid)
8.5% – 11.0%
Cold Brew Concentrate
1:4 to 1:5
100.0 g
450 g
3.5% – 5.0%
Frequently Asked Questions (FAQ)
Authoritative answers to common questions about coffee-to-water ratios, measuring grounds, water temperature, and extraction methods.
A coffee brew ratio expresses the proportional weight relationship between dry ground coffee and brew water (formatted as 1:X, where 1 part coffee is brewed with X parts water by mass). For example, a 1:16 ratio means 1 gram of coffee for every 16 grams (ml) of water. Controlling this ratio is the single most critical factor for dialing in body, sweetness, flavor clarity, and balanced extraction.
A 1:15 ratio is richer and heavier in body with amplified sweetness and lower perceived acidity (great for dark or medium roasts). A 1:16 ratio is the SCA Golden Standard, offering perfect harmony between clarity and body. A 1:18 ratio is lighter, brighter, and more delicate with high floral clarity (ideal for delicate light roast single-origins and washed Ethiopians).
The optimal pour-over ratio is 1:15 to 1:17. For Hario V60, 1:16 (e.g. 15g coffee to 240g water or 30g coffee to 480g water) is the universal specialty standard. For Chemex, 1:15 to 1:16 with a slightly coarser grind balances the thicker filtration paper. For Kalita Wave flat-bottom drippers, 1:15.5 to 1:16 maximizes sweet even extraction.
French Press uses a tighter 1:12 to 1:15 ratio with coarse coffee grounds. Because immersion brewing has lower extraction efficiency than percolation (pour-over), using a 1:14 ratio (e.g., 35g coffee to 500g water) yields a full-bodied, rich, syrupy cup without extracting bitter polyphenols during the 4-minute steep.
Espresso uses tight weight-in to weight-out extraction ratios: Standard Espresso is 1:2 (e.g., 18g dry grounds yielding 36g liquid espresso in 25–30s); Ristretto (restricted shot) is 1:1 to 1:1.5 (e.g., 18g grounds yielding 18–27g liquid for intense sweetness and heavy crema); Lungo (long shot) is 1:2.5 to 1:3 (e.g., 18g grounds yielding 45–54g liquid with higher clarity and lighter body).
For Cold Brew Concentrate (designed to be served over ice with equal parts water or milk), use a 1:4 to 1:5 ratio steeped for 16 to 24 hours (e.g., 100g coarse coffee to 500g water). For Ready-to-Drink Cold Brew (served directly without dilution), use a 1:8 to 1:10 ratio.
Divide your total water weight (in grams or ml) by your target brew ratio: Coffee (g) = Water (g) / Ratio Number. Example for a 350 ml travel mug at a 1:16 ratio: 350 / 16 = 21.88 g of dry coffee grounds.
Coffee beans vary drastically in density based on roast level, bean size, and origin. Light roast beans are significantly denser than dark roast beans (which puff up and expand during roasting). A volume scoop of dark roast coffee can weigh up to 25% less than a scoop of light roast, causing wild extraction inconsistency. Weighing on a 0.1g digital scale ensures exact repeatability.
Total Dissolved Solids (TDS %) measures the concentration of coffee soluble solids dissolved in water (strength), typically 1.15% to 1.45% for drip coffee and 8% to 12% for espresso. Extraction Yield (EY %) measures the percentage of total dry coffee mass dissolved into the cup (target: 18% to 22%). The relationship is governed by the formula: Extraction Yield (%) = (Brew Yield (g) * TDS (%)) / Dose (g).
Higher water temperatures (202°F–205°F / 94°C–96°C) accelerate the extraction rate, pairing best with wider ratios (1:16 to 1:17) and dense light roasts. Lower water temperatures (195°F–198°F / 90°C–92°C) slow extraction, pairing best with tighter ratios (1:13 to 1:15) and dark roasts to prevent harsh, ashy flavors.
