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Coffee to Water Ratio Calculator
Perfect your brew with precise ratios for any brewing method
Pour Over Details
Recommended Ratio
1:15 - 1:18
Grind Size
Medium
Brew Time
3-4 minutes
g
g
Your Brew Recipe
20.0g
Coffee
320.0g
Water
1:16.0
Ratio
✅ Perfect ratio for Pour Over!
Yield note: Coffee grounds absorb approximately 2x their weight in water. Your final cup will be roughly 280ml of brewed coffee from 320g of water input.
Quick Presets
Volume Conversions
320g water = 10.8 fl oz = 1.35 cups
Ratios based on Specialty Coffee Association Golden Cup Standard
How Coffee to Water Ratios Work
The coffee to water ratio is the foundation of brewing great coffee. It determines the strength, extraction level, and flavor balance of your final cup. Professional baristas use precise ratios to achieve consistent, optimal results every time.
Understanding Brew Ratios
A brew ratio expresses the relationship between coffee grounds and water. For example, a 1:16 ratio means 1 gram of coffee for every 16 grams (ml) of water. The Specialty Coffee Association (SCA) recommends ratios between 1:15 and 1:18 for most brewing methods.
Standard Ratios by Method (SCA Golden Cup):
- Pour-Over (V60, Chemex): 1:16 - Clean, bright cups with pronounced clarity
- French Press: 1:15 - Full-bodied, rich texture with natural oils
- Espresso: 1:2 - Concentrated, syrupy mouthfeel
- Cold Brew (Concentrate): 1:8 - Smooth, low-acid concentrate (dilute before serving)
- AeroPress: 1:16 (standard) to 1:11 (concentrate) - Versatile extraction
Why Brew Ratios Matter
Using the correct ratio ensures proper extraction - the process of dissolving flavor compounds from coffee grounds. Too little coffee (weak ratio like 1:20) results in under-extraction: thin body with sour, hollow notes. Too much coffee (strong ratio like 1:10) can lead to over-extraction: bitter, harsh, and astringent. The SCA "Golden Cup" standard targets 18-22% extraction for balanced sweetness, acidity, and body. For grind size guidance, see our Coffee Grind Size Guide. To check the caffeine and calorie content of your brewed cup, try the Coffee Calorie Calculator.
Frequently Asked Questions
What is the golden ratio for coffee?
The "golden ratio" is typically 1:15 to 1:18 (1 gram of coffee to 15-18 grams of water). The Specialty Coffee Association recommends 1:16 as a starting point for most brewing methods. This ratio produces a balanced cup with proper extraction around 18-22% total dissolved solids (TDS).
How do I calculate coffee to water ratio?
To calculate: divide your desired water amount by the ratio number. For example, with 320g water and a 1:16 ratio: 320 ÷ 16 = 20g of coffee needed. Or, multiply coffee amount by the ratio for water needed: 20g coffee × 16 = 320g water. Use our calculator above for instant results.
Can I use the same ratio for all brewing methods?
No, different brewing methods require different ratios. Espresso uses much stronger ratios (1:2) because it's a concentrated extraction. French press works well at 1:12 for full-bodied coffee. Pour-over typically uses 1:16 for clean, balanced cups. Cold brew uses 1:8 because it's diluted before drinking. Each method's contact time and filtration affects the ideal ratio.
Should I weigh coffee and water or use volume?
Always weigh both coffee and water by mass (grams) for precision. Volume measurements (tablespoons, cups) are inconsistent because coffee density varies by roast level and grind size. One gram of water equals one milliliter, making metric measurements perfect for brewing. A digital scale accurate to 0.1g is essential for specialty coffee.
How do I adjust ratio for a bolder or lighter cup?
For a bolder, more full-bodied cup, use more coffee (lower ratio, like 1:14). For a lighter, tea-like cup with bright acidity, use less coffee (higher ratio, like 1:18). Adjust in small increments (1-2 ratio points) and taste the difference. Remember: strength affects intensity, while extraction (grind size, time, temperature) affects flavor clarity and balance.
What is the difference between weight (grams) and volume (ml)?
Weight (grams) measures mass and is consistent regardless of density. Volume (ml or cups) measures space and varies by how packed the coffee is. 1 gram of water equals 1 milliliter, but 1 gram of coffee can occupy different volumes depending on roast level (dark roasts are less dense) and grind size. Using weight ensures consistency every brew.
What ratio does Starbucks use?
Starbucks uses approximately 1:18 ratio for drip coffee (2 tablespoons or ~10g per 6oz/180ml cup), which is slightly weaker than specialty coffee standards. Their dark roasts are formulated for this ratio. For home brewing with specialty light-medium roasts, 1:15 to 1:16 typically produces a more developed, complex flavor profile.
What grind size should I use for each method?
Grind size affects extraction rate and should match your brew method. Espressouses fine grounds (like table salt). Pour-over uses medium grounds (like sea salt). French Press and Cold Brew use coarse grounds (like raw sugar). Finer grinds extract faster but risk bitterness; coarser grinds extract slower but produce sweeter, cleaner cups.
