Standard Coffee-to-Water Ratios Set by SCAA

If you’ve ever wondered how much coffee and water you should actually use for a balanced cup—whether you’re making one mug or a full pot—the Specialty Coffee Association of America (SCAA) has long provided clear, research-backed guidelines. But with multiple tables, conversion formulas, and extraction science involved, it’s easy to get lost. Here’s a clear breakdown of the official standards, what they mean, and how to apply them for better everyday brewing.

The SCAA defines a standard brew ratio as 1:18.2 (1 gram of coffee to 18.2 grams or milliliters of water), or roughly 10 grams of coffee to 220 grams (220 mL) of water for a balanced cup. For stronger “connoisseur” style, aim closer to 1:16. That means 10 grams of coffee to about 160–170 grams of water.

What Is the SCAA Standard Brewing Ratio?

The SCAA, now part of the global Specialty Coffee Association (SCA), developed a set of standardized coffee-to-water ratios to help achieve balanced, repeatable extractions. These ratios are based on achieving optimal extraction yield (18–22%) and beverage concentration (1.15–1.35% TDS) using common home and café brewing methods like pour-over, drip, or French press.

The standard table provides exact amounts of coffee and water (by weight and volume) for making 1 to 12 cups of coffee:

• 1 cup: 10.6g (0.38 oz) coffee, 237mL (8 fl oz) water
• 2 cups: 21.3g (0.75 oz) coffee, 473mL (16 fl oz) water
• 3 cups: 31.9g (1.13 oz) coffee, 710mL (24 fl oz) water
• 4 cups: 42.5g (1.50 oz) coffee, 947mL (32 fl oz) water
• 5 cups: 53.2g (1.88 oz) coffee, 1183mL (40 fl oz) water
• 6 cups: 63.8g (2.25 oz) coffee, 1420mL (48 fl oz) water
• 7 cups: 74.4g (2.63 oz) coffee, 1656mL (56 fl oz) water
• 8 cups: 85.1g (3.00 oz) coffee, 1893mL (64 fl oz) water
• 9 cups: 95.7g (3.38 oz) coffee, 2130mL (72 fl oz) water
• 10 cups: 106.3g (3.75 oz) coffee, 2366mL (80 fl oz) water
• 11 cups: 116.9g (4.13 oz) coffee, 2603mL (88 fl oz) water
• 12 cups: 127.6g (4.50 oz) coffee, 2840mL (96 fl oz) water

These numbers assume standard brew strength and typical home brewing scenarios. All measurements are provided in both ounces/grams (weight) and fluid ounces/cups/milliliters (volume).

Connoisseur Brewing Ratios: Stronger, More Intense Cups

For those who prefer a stronger, more intense cup, the SCAA also provides a “connoisseur” ratio table. This version uses slightly less water per unit of coffee, resulting in higher extraction and concentration—essentially a bolder brew.

The connoisseur standard is around 1:16 (compared to the standard 1:18.2), meaning:

• 1 cup: 10.6g (0.38 oz) coffee, 177mL (6 fl oz) water
• 2 cups: 21.3g (0.75 oz) coffee, 355mL (12 fl oz) water
• 3 cups: 31.9g (1.13 oz) coffee, 532mL (18 fl oz) water
• 4 cups: 42.5g (1.50 oz) coffee, 710mL (24 fl oz) water
• 5 cups: 53.2g (1.88 oz) coffee, 887mL (30 fl oz) water
• 6 cups: 63.8g (2.25 oz) coffee, 1065mL (36 fl oz) water
• 7 cups: 74.4g (2.63 oz) coffee, 1242mL (42 fl oz) water
• 8 cups: 85.1g (3.00 oz) coffee, 1420mL (48 fl oz) water
• 9 cups: 95.7g (3.38 oz) coffee, 1597mL (54 fl oz) water
• 10 cups: 106.3g (3.75 oz) coffee, 1775mL (60 fl oz) water
• 11 cups: 116.9g (4.13 oz) coffee, 1952mL (66 fl oz) water
• 12 cups: 127.6g (4.50 oz) coffee, 2130mL (72 fl oz) water

In practical terms, using 10 grams of coffee, the standard ratio calls for ~220g (220mL) of water, while the connoisseur ratio uses only about 160–170g (160–170mL)—a notably stronger cup.

How to Use These Ratios: The Science Behind the Numbers

The SCAA’s brewing standards are grounded in the concept of the “Gold Cup,” a benchmark for optimal filter coffee. Achieving this involves balancing four critical factors:

• Brew ratio: Typically 1:15 to 1:20; a good starting point is 1:18 (e.g., 10g coffee to 180mL water)
• Grind size: Around 0.86mm, similar to table sugar
• Contact time: Approximately 3 minutes of water-to-coffee immersion or flow time
• Water temperature: Between 92–96°C (197–205°F)

When dialed in correctly, these variables produce coffee with an extraction yield of 18–22% and a TDS (total dissolved solids) concentration of 1.15–1.35%. That sweet spot is visually represented in the SCAA’s brewing control chart, where ideal cups fall within the yellow “balanced” range.

Without a refractometer to measure TDS, you can still hit this target consistently by sticking to the 1:15–1:20 brew ratio, fine-tuning grind size, keeping your water temperature steady, and aiming for a 3-minute brew time.

Frequently Asked Questions

What is the SCAA standard coffee-to-water ratio?

The SCAA standard brewing ratio is 1:18.2 by weight, or roughly 10 grams of coffee to 220 grams (220 mL) of water. This yields a balanced cup with an extraction yield of 18–22% and a TDS concentration of 1.15–1.35%, considered ideal for flavor balance.

What’s the difference between standard and connoisseur brewing ratios?

The standard SCAA ratio is 1:18.2, producing a balanced cup. The connoisseur ratio is stronger, around 1:16—about 10 grams of coffee to 160–170 grams of water—resulting in higher extraction and more intense flavor.

How do I calculate water needed based on coffee weight?

For standard brews, multiply your coffee weight (in ounces) by 21.33 to get water in ounces, or by 22.2593 for water in milliliters. For connoisseur brews, multiply coffee weight by 16 for ounces or 16.6945 for milliliters.

What grind size and water temperature should I use with these ratios?

The SCAA recommends a grind size around 0.86mm (similar to table sugar) and a water temperature between 92–96°C (197–205°F) for optimal extraction using these ratios.

Can I use these ratios for any brewing method?

Yes, these ratios are designed for common manual and automatic brewing methods including pour-over, drip machines, and French press. Adjust based on brew time and equipment specifics, but the ratio remains a solid baseline.

Why is the 1:15–1:20 range commonly recommended if SCAA says 1:18.2?

The 1:15–1:20 range offers flexibility for different beans, roasts, and taste preferences. 1:18.2 is the SCAA’s calculated standard for balanced extraction, but 1:15–1:20 is a practical, forgiving range most home brewers can start with and adjust by taste.

Recommended FrontStreet Beans for Standard Brews

For SCAA-standard brews at 1:15–1:20, try FrontStreet Coffee’s Ethiopia Yirgacheffe for bright citrus and floral tones, or Colombia Huila for nutty chocolate balance. Their Brazil Cerrado offers a smooth, low-acid base perfect for dialing in 1:18 brews. All work well with a 0.86mm grind and 93°C water. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.