Coffee Brewing Calculator
Scale recipes by weight or yield, compare extraction variables, and brew to perfection with our visual guide & sound-alert timer.
Advanced Customizations
Grams of water absorbed per gram of dry coffee.
Percentage of coffee bean compounds dissolved in water.
Dry Coffee Beans
20.0
g
Water Volume to Pour
320.0
g
Estimated Coffee Yield (Cup size)
280.0
g
Water Absorbed
40.0 g
Grind Profile
Medium-Fine
Water Temperature
94°C
Actions
Ratio Strength Spectrum
Strong
Ideal Balance
Light
Golden Ratio (Perfect Balance)
Guided Brew Timer
00:00
Ready
Select brewing preset, configure weight parameters, and press Start.
Recent Brewing History Log
| Date / Time | Method | Coffee Used | Water Poured | Brew Ratio | Yield Volume | Action |
|---|
No coffee sessions logged yet. Tap "Log Recipe" above to record your extractions.
Scientific Foundations of Coffee Extraction
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Brew Ratio
The ratio of dry coffee grounds to hot water regulates strength (solubles density) and extraction rate. Ratios between 1:15 and 1:18 are considered the "Golden Ratio" range for drip brewing. Higher ratios (like 1:18) yield lighter, tea-like notes, while lower ratios (1:12 to 1:14) produce dense, heavier bodies.
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Grind Size Profile
Grind size determines the total surface area exposed to hot water. Fine grinds (used in Espresso) expand surface exposure, calling for rapid, pressurized extractions. Coarse grinds (French Press) require prolonged immersion times (e.g. 4 minutes) to dissolve soluble compounds slowly and prevent bitterness.
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Water Temperature
Water temperature affects the rate at which flavors are extracted from grounds. Hotter water (94°C–96°C) extracts rapidly, which can pull bitter compounds if over-extracted. Cooler water (85°C–88°C) is ideal for dark roasts or specific devices like AeroPress to minimize bitterness and highlight sweetness.
Coffee Brewing Calculator Guide & FAQs
The Chemistry of Coffee Extraction & Brew Ratios
Brewing the perfect cup of coffee is a precise chemical extraction process. The strength and flavor profile of your brew are determined by the ratio of dry coffee grounds to water, known as the brew ratio. Specialty coffee organizations recommend the 'Golden Ratio' of 1:15 to 1:18, representing 1 gram of coffee for every 15 to 18 grams of water.
A lower ratio (e.g., 1:15) results in a stronger, more concentrated cup, while a higher ratio (e.g., 1:18) yields a lighter, more extracted cup. Grind size must match your brewing method to optimize extraction time: fine grinds for short extractions (espresso), medium for filter (pour-over), and coarse for long steeps (French press). Our calculator also accounts for water absorption: coffee grounds typically absorb roughly 2 times their weight in water, meaning your final beverage yield is less than the water poured.
Brew Ratios & Guided Timers
Our coffee planner computes grounds, water, and yield volumes instantly based on your chosen brew method. The integrated brewing timer provides step-by-step instructions for blooms and pours, ensuring consistent extractions every time.
Frequently Asked Questions
What is the 'Golden Ratio' in coffee brewing?
The Golden Ratio is a guideline recommending a ratio of 1 gram of coffee to 15-18 grams of water (written as 1:15 to 1:18). This ratio yields optimal extraction, balancing strength and flavor clarity for most drip and pour-over methods.
How does water absorption affect my final coffee yield?
During brewing, coffee grounds absorb and retain about 2 times their dry weight in water. If you brew 30g of coffee with 500g of water, the grounds will retain roughly 60g of water, resulting in a final beverage weight of about 440g.
What is the purpose of 'blooming' coffee?
Blooming involves pouring a small amount of hot water (typically double the weight of the coffee grounds) over the coffee and waiting 30-45 seconds. This releases trapped carbon dioxide gas, allowing the remaining water to extract flavors more evenly.