Cold Brew Ratio Calculator: Coffee, Water, Dilution & Yield

Use weights and volumes you can verify. The calculator shows its formulas and keeps every input in your browser.

Coffee dose from water and ratio

Water (ml) Water-to-coffee ratio (1 : n)

Coffee needed125 g1,000 ml ÷ 8 = 125 g

Estimated yield, dilution, and servings

Coffee (g) Water added (ml) Estimated water retained per gram of coffee (ml) Diluent parts per 1 part brewed liquid Serving size (ml)

Brew ratio1:8

Estimated brewed liquid750 ml

Final diluted volume750 ml

Servings3

Yield = 1,000 − (125 × 2) = 750 ml. Final volume = 750 × (1 + 0) = 750 ml.

What this calculator does not predict

Flavor, extraction, strength, or an ideal recipe
Caffeine or nutritional content
Actual filter loss, evaporation, sediment, or coffee retention
Shelf life, food safety, or compatibility with a specific brewer

One milliliter of water is treated as one gram for ratio arithmetic. Retention is an editable estimate, not a measured property of your coffee. Follow the product manual and applicable food-safety guidance.