Coffee Brew Ratio Calculator
Calculate the ideal coffee-to-water ratio for pour over, French press, espresso, and cold brew.
Formula
Coffee (g) = Water (g) / Ratio
Where Water is the total amount of water in grams (1ml = 1g), and Ratio is the brew method and strength-specific coffee-to-water ratio. For example, a 1:16 ratio means 1 gram of coffee for every 16 grams of water. Different brew methods use different ratios optimized for their extraction mechanics.
Worked Examples
Example 1: Pour Over for Two Cups
Problem: You want to brew 2 cups (240ml each) of medium-strength pour over coffee. How much coffee and water do you need?
Solution: Total water: 2 x 240ml = 480ml (480g)\nMedium pour over ratio: 1:16\nCoffee needed: 480g / 16 = 30g\nIn tablespoons: 30g / 5 = 6 tablespoons\nWater temperature: 195-205F\nGrind: Medium-Fine\nBrew time: 3-4 minutes
Result: 30g coffee (6 tbsp) with 480ml water at 195-205F, medium-fine grind, 3-4 min brew
Example 2: Cold Brew Concentrate Batch
Problem: Make a strong cold brew concentrate using 4 cups of water (960ml) at a 1:5 ratio.
Solution: Total water: 4 x 240ml = 960ml (960g)\nStrong cold brew ratio: 1:5\nCoffee needed: 960g / 5 = 192g\nIn tablespoons: 192g / 5 = 38.4 tablespoons\nWater temperature: 35-70F (cold/room temp)\nGrind: Extra Coarse\nSteep time: 12-24 hours in refrigerator
Result: 192g coffee (38.4 tbsp) with 960ml cold water, extra coarse grind, steep 12-24 hours
Frequently Asked Questions
What is the golden ratio for coffee brewing?
The Specialty Coffee Association (SCA) recommends a golden ratio of 1:16 to 1:18 for most brewing methods, meaning 1 gram of coffee for every 16 to 18 grams of water. This ratio produces a balanced cup with proper extraction, typically between 18-22% of the coffee grounds dissolved into the water. The golden ratio was established through decades of sensory research and taste testing by professional cuppers. For pour over and drip methods, 1:16 is considered ideal for medium strength. French press benefits from a slightly stronger 1:15 ratio due to the full-immersion brewing style that produces a naturally heavier body.
How does grind size affect coffee extraction?
Grind size is one of the most critical variables in coffee brewing because it determines the surface area exposed to water and thus controls extraction rate. Finer grinds expose more surface area, leading to faster extraction and stronger flavors, but can also cause over-extraction resulting in bitterness if brew time is not adjusted. Coarser grinds extract more slowly, producing a cleaner and lighter cup but risking under-extraction if brew time is too short. Each brewing method requires a specific grind size calibrated to its contact time: espresso uses very fine grounds with 25-30 seconds of contact, while cold brew uses extra coarse grounds with 12-24 hours of steeping.
What water temperature should I use for brewing coffee?
The optimal water temperature for most hot brewing methods is between 195 and 205 degrees Fahrenheit (90-96 degrees Celsius), just below boiling point. Water at this range extracts the ideal balance of acids, sugars, and bitter compounds from the coffee grounds. Water that is too hot (above 205F) will over-extract the grounds, pulling out excessive bitter and astringent flavors. Water that is too cool (below 190F) will under-extract, producing a sour, flat, and underdeveloped cup. Cold brew is the exception, using cold or room temperature water between 35-70F with an extended steeping time of 12-24 hours to achieve full extraction without heat.
Why does pour over coffee taste different from French press?
Pour over and French press produce distinctly different cups because of their fundamentally different brewing mechanics. Pour over uses a paper filter that traps oils and fine particles, resulting in a clean, bright, and nuanced cup that highlights delicate flavor notes and acidity. French press is a full-immersion method with a metal mesh filter that allows oils and fine sediment to pass through, creating a heavier body, richer mouthfeel, and bolder flavor profile. The contact time also differs: pour over typically takes 3-4 minutes with water passing through the grounds, while French press steeps for 4-5 minutes with grounds fully submerged. These differences make pour over better for showcasing single-origin beans and French press better for dark roasts.
How much coffee do I need for cold brew concentrate?
Cold brew concentrate uses a much higher coffee-to-water ratio than hot brewing methods, typically between 1:5 and 1:8 by weight, compared to 1:16 for hot coffee. For a standard batch, use about 100 grams (roughly 1 cup) of coarsely ground coffee per 800ml of cold water. This produces a concentrate that should be diluted 1:1 or 1:2 with water, milk, or ice before drinking. The extended steeping time of 12-24 hours compensates for the lack of heat by slowly extracting flavors over a long period. Cold brew concentrate can be stored in the refrigerator for up to two weeks without significant flavor degradation, making it an efficient preparation method for busy schedules.
Does the type of water affect coffee taste?
Water quality has a dramatic impact on coffee flavor since brewed coffee is approximately 98% water. Hard water with high mineral content can make coffee taste flat and chalky, while completely soft or distilled water produces a sharp, overly acidic cup. The SCA recommends water with 150mg/L total dissolved solids (TDS) for optimal extraction. Chlorinated tap water imparts off-flavors that mask the subtle notes in specialty coffee. Using filtered water from a basic carbon filter removes chlorine while retaining beneficial minerals. Some coffee enthusiasts use mineralized water recipes (adding specific amounts of magnesium and calcium to distilled water) to achieve the perfect mineral balance for extraction.