Determine exactly how much coffee you need for any volume of water based on your preferred brew ratio.
Last updated: March 2026
Coffee brewing is essentially a process of extraction. The ratio of coffee to water determines the concentration of dissolved coffee solids in your final cup. A 1:16 ratio is a great starting point for most brew methods, resulting in a balanced cup with a clean finish.
By using a consistent ratio and weighing your ingredients, you can easily scale your brew for any number of people. Whether you're brewing a single cup or a large batch for a party, the math remains the same.
Imagine you're brewing for a group or need a specific batch size. Enter the total water volume you want to prepare—whether it's 500ml for a small group or 2000ml for a gathering. This calculator works for any volume.
Select your preferred ratio. The 1:16 SCA Golden Ratio is standard, but some prefer 1:15 (stronger) or 1:17 (lighter). All cup sizes and batch volumes maintain the same ratio—it scales proportionally in either direction.
The calculator divides your water volume by the ratio to give you the exact coffee weight needed. This is the reverse of the CoffeeRatioCalculator—instead of “How much water do I need?” this answers “How much coffee do I need?”
Grind your calculated coffee amount to the appropriate grain size for your brewing method. Pour your measured water at 195–205°F and brew according to your method's standard timing (3–5 minutes typically). The consistent ratio ensures balanced results at any scale.
Keep a brewing journal noting the coffee weight, water amount, ratio, grind size, and any tasting notes. By maintaining consistent ratios across multiple brews, you can isolate variables and perfect your preferred flavor profile over time.
You're hosting a book club with 8 guests, and you want to provide fresh-brewed coffee with consistent quality. You've decided on 1500ml total (enough for roughly 5 cups of 300ml each with a little extra), using a 1:16 ratio to keep it balanced and approachable.
You weigh 94g of your favorite medium roast, grind it to medium coarseness, and brew with 1500ml of 200°F water in your large Chemex. The result: 5–6 balanced cups ready to serve. Every guest gets the same quality brew because you maintained the precise ratio at scale.
Divide your water amount by the brew ratio. For 1000ml of water with a 1:16 ratio, divide 1000 by 16 = 62.5g of coffee. This calculator does that math automatically. The lower the ratio number, the more coffee you'll need.
1:16 is the industry standard (called the 'SCA Golden Ratio') for most brewing methods. It produces a balanced cup. However, some prefer 1:15 for a stronger brew or 1:17 for a lighter cup. Experiment to find your sweet spot!
Consistency is everything in coffee. Using the same ratio every time allows you to adjust other variables (grind, temperature, brew time) and identify what actually affects your cup. Without ratio consistency, you can't troubleshoot brewing problems effectively.
No, espresso uses a completely different ratio system measured in grams per shot (typically 1:2 or 1:2.5 output:input by weight). This calculator is for immersion and percolation methods like pour-over, drip, and French press. Espresso requires specialized calculations.
The ratio itself doesn't change, but water temperature affects extraction rate. Hotter water (205°F) extracts faster and stronger; cooler water (195°F) extracts slower and lighter. Adjust grind fineness if ratio produces the wrong strength, or experiment with temperature for fine-tuning.
Use a digital kitchen scale set to grams mode. 1ml of water weighs 1 gram, so 1000ml = 1000g. For this reason, many brewers skip measuring volume and measure water weight directly. A scale is essential for accurate ratio brewing.
The Coffee Ratio Calculator starts with coffee weight and calculates water needed. This calculator starts with water volume and calculates coffee needed. They're inverses of the same formula—choose whichever matches your brewing workflow better.
Aim for ±1g precision on your scale. Rounding 62.5g to 62g or 63g is fine and won't noticeably change your cup. As you get more invested in coffee, tighter precision helps dial in your preferred flavor. For casual brewing, ±5% error is acceptable.