Cold Brew Ratio Calculator
Estimate cold brew water, modeled concentrate yield and servings after dilution.
Formula and sources updated · Data sources · 1View algorithm, constants and default inputs (JSON)
About this calculator
The selected 1:4, 1:8, 1:12 or 1:15 ratio gives brew water per gram of coffee. The concentrate yield is modelled as 85% of that water to allow for liquid retained by grounds; actual yield varies. The serving multiplier describes final volume divided by concentrate volume. It is a planning estimate, not a strength or caffeine prediction.
Worked example
calculated with the default values below
Coffee 100 g · Target ratio Concentrate (1:8) · Final volume multiplier 2 Water to brew with 800 ml · Concentrate produced 680 ml · Servings after dilution (250 ml) 5.4
Method and assumptions
W = C × r; Q = 0.85W; D = Q × m; servings = D ÷ 250 m is final volume divided by concentrate volume and must be 1–10. The 85% yield is an estimate; caffeine and drink strength are not predicted. The selected 1:4, 1:8, 1:12 or 1:15 ratio gives brew water per gram of coffee. The concentrate yield is modelled as 85% of that water to allow for liquid retained by grounds; actual yield varies. The serving multiplier describes final volume divided by concentrate volume. It is a planning estimate, not a strength or caffeine prediction. The references provide context and limitations. They do not validate this page’s illustrative multipliers, lookup values or predictions.
Data sources
The references provide context and limitations. They do not validate this page’s illustrative multipliers, lookup values or predictions.
Disclaimer
These calculators give general cooking guidance. Ingredient density, oven calibration, altitude and equipment all vary, and safe minimum internal temperatures always take precedence over timings. Follow the food-safety advice issued by your national authority.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
W = C × r; Q = 0.85W; D = Q × m; servings = D ÷ 250
- C
- coffee in grams
- r
- coffee-to-water ratio
- W
- brewing water in ml
- Q
- concentrate yield in ml
- d
- dilution multiplier
- D
- final volume in ml
m is final volume divided by concentrate volume and must be 1–10. The 85% yield is an estimate; caffeine and drink strength are not predicted.
Frequently asked questions
How does the serving multiplier work?
A multiplier of 2 means a final drink volume twice the modeled concentrate volume—equivalent to adding roughly one concentrate volume of water or milk. The concentrate yield uses an 85% estimate of brew water, but filtration losses vary. The page does not predict caffeine or drink strength.
Which inputs and limits apply to Cold Brew Ratio Calculator?
Use the units shown beside each field. These are form limits, not recommended settings. Coffee: 0–5,000 g W = C × r; Q = 0.85W; D = Q × m; servings = D ÷ 250 m is final volume divided by concentrate volume and must be 1–10. The 85% yield is an estimate; caffeine and drink strength are not predicted. The selected 1:4, 1:8, 1:12 or 1:15 ratio gives brew water per gram of coffee. The concentrate yield is modelled as 85% of that water to allow for liquid retained by grounds; actual yield varies. The serving multiplier describes final volume divided by concentrate volume. It is a planning estimate, not a strength or caffeine prediction. The references provide context and limitations. They do not validate this page’s illustrative multipliers, lookup values or predictions.
What is a complete worked example for Coffee = 100 g; Target ratio = Concentrate (1:8)?
Inputs: Coffee = 100 g; Target ratio = Concentrate (1:8); Final volume multiplier = 2. Calculation: W = C × r; Q = 0.85W; D = Q × m; servings = D ÷ 250. Results: Water to brew with = 800 ml; Concentrate produced = 680 ml; Servings after dilution (250 ml) = 5.4.