Coffee Ratio Calculator

Calculate the perfect coffee-to-water ratio for French press, pour over, or espresso. This tool processes all data locally in your browser. No information is ever sent to any server. Completely free, no registration required.

How to Use the Coffee Ratio Calculator

1. Enter your input values above
2. Results update automatically
3. Copy or download the output

What is a Coffee Ratio Calculator?

A Coffee Ratio Calculator helps you brew the perfect cup by calculating the ideal ratio of coffee grounds to water. The Specialty Coffee Association (SCA) recommends the 'Golden Ratio' of 1:16 to 1:18 (1 gram of coffee per 16-18 grams of water). But the right ratio depends on your brewing method — espresso uses a concentrated 1:2 to 1:3 ratio, pour-over and drip typically use 1:15 to 1:17, French press 1:13 to 1:15, and cold brew concentrate can be as strong as 1:4 to 1:8. In 2026, with specialty coffee at home more popular than ever, precision brewing has become mainstream.

How Does It Work?

Choose your brewing method (espresso, pour-over, drip, French press, AeroPress, cold brew) and enter either the amount of coffee or the desired final beverage amount. The calculator determines the other using the recommended ratio for your method. Results show in grams (for precision) and approximate tablespoons/scoops (for convenience, 1 tbsp ≈ 5-7g depending on grind and roast). For water measurement, 1ml = 1g.

Formula

SCA Golden Ratio: 1g coffee : 16-18g water\n\nBrewing Method Ratios:\n• Espresso (ristretto): 1:1 to 1:2\n• Espresso (normale): 1:2 to 1:3\n• AeroPress: 1:13 to 1:16\n• French Press: 1:13 to 1:15\n• Pour-Over (V60, Chemex): 1:15 to 1:17\n• Drip/Automatic: 1:16 to 1:18\n• Cold Brew Concentrate: 1:4 to 1:8 (dilute 1:1 with water/milk)\n\nWater (g) = Coffee (g) × Ratio (e.g., × 16)\nCoffee (g) = Water (g) ÷ Ratio\n\nConversion: 1g water = 1ml | 1 US fl oz = 29.6ml\n1 tbsp ground coffee ≈ 5g (fine grind) to 7g (coarse grind)

Who Uses This Tool?

• Home baristas dialing in the perfect pour-over ratio
• Espresso enthusiasts calculating dose and yield
• Café owners standardizing recipes across multiple baristas
• Coffee drinkers transitioning from 'scoops' to precision weighing
• Cold brew makers calculating concentrate-to-water dilution

Pro Tips

• Weigh your coffee AND water with a scale ($20-30 kitchen scale is sufficient). Coffee density varies by roast (dark roast is less dense), grind size, and bean origin
• The 'Golden Ratio' (1:16) is a starting point — adjust to taste. More coffee (1:14) = stronger, bolder. Less coffee (1:18) = lighter, more nuanced extraction
• Water quality matters: use filtered water at 195-205°F (90-96°C). Avoid distilled water — minerals (calcium, magnesium) are essential for proper extraction
• For cold brew, steep 12-24 hours in the refrigerator. The long extraction time compensates for the cold temperature, producing a smooth, low-acid concentrate

Frequently Asked Questions about Coffee Ratio Calculator

Why weigh coffee instead of using tablespoons?

Coffee density varies significantly — a tablespoon of finely ground dark roast can weigh 5g, while coarsely ground light roast can weigh 7g (a 40% difference). Weighing ensures consistency cup after cup.

What's the best ratio for pour-over coffee?

Start with 1:16 (e.g., 20g coffee, 320g water) and adjust by taste. If it's too weak, try 1:15. If too strong or bitter, try 1:17. The right ratio also depends on grind size, water temperature, and bean origin.

Free online Coffee Ratio Calculator — no signup, 100% client-side processing. All data stays in your browser.