Coffee to Water Ratio Calculator

Brew Snapshot

{{ formatNumber(results.coffee_g, 1) }} g / {{ formatNumber(results.coffee_oz, 2) }} oz coffee

{{ formatNumber(results.brew_water_g, 0) }} g / {{ formatNumber(results.brew_water_fl_oz, 1) }} fl oz water

Yield {{ formatNumber(results.beverage_ml, 0) }} mL / {{ formatNumber(results.beverage_fl_oz, 1) }} fl oz

{{ methodLabel }} · Typical {{ methodRangeDisplay }} · {{ brewTimeDisplay }} · {{ waterTempDisplay }}

{{ strengthInfo.label }} {{ ratioStatus.summary }} ≈ {{ formatNumber(results.cups, 2) }} cups Bloom {{ formatNumber(results.bloom_ml, 0) }} g {{ roastInfo.label }}

Start from:

Use coffee-first for a weighed dose, or beverage-first when the serving volume is fixed.

Brew method:

Choose the closest brewer; the ratio and advanced recipe settings stay editable.

Brew ratio:

Type only the water number, such as 16 for a 1:16 recipe.

Coffee dose:

Use weighed grams or ounces for repeatability, or tbsp for a quick scoop estimate.

Final beverage volume:

Enter finished drink volume; cup units use the Advanced cup size setting.

Cup size:

Typical mugs are 240 mL or 8 fl oz; change it to match your cup or server.

Grounds absorption:

Hot filter brews often land near 2.0-2.2 mL/g; immersion may retain more.

mL/g

Tablespoon weight:

Use your scoop weight if known; 5.5 g/tbsp is a coarse default.

g/tbsp

Bloom water:

Try 2.0 for many hot filter brews; cold brew and moka usually need less.

x coffee

Roast level:

Select light, medium, or dark to shape heat advice for the chosen brew method.

Water temperature:

Enter kettle temperature in C or F; switching method presets reloads this target.

Brew time:

Use minutes; 720 equals a 12-hour cold brew steep.

min

#	Metric	Value	Notes	Copy
{{ row.idx }}	{{ row.label }}	{{ row.value }}	{{ row.note \|\| '—' }}

Servings	Coffee	Water	Yield	Notes	Copy
{{ row.servings }}	{{ row.coffee }}	{{ row.water }}	{{ row.yield }}	{{ row.note }}

Scenario	Adjustment	Why	Copy
{{ row.scenario }}	{{ row.adjustment }}	{{ row.reason }}

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A coffee-to-water ratio turns a desired brew style into a repeatable recipe. It can start from the coffee dose already on the scale or from the final beverage amount you need to serve, then account for water that stays trapped in the wet grounds.

The calculator plans coffee dose, total brew water, bloom water, expected absorbed water, final beverage yield, servings, method-window status, temperature guidance, brew time, batch scaling, charts, and a JSON recipe summary. It supports pour-over, Chemex, automatic drip, Clever, French press, AeroPress, siphon, cold brew concentrate, moka pot, and custom ratio work.

Coffee ratio planning flow from dose or yield through ratio, absorption, recipe, checks, and scaling. — Coffee ratio planning can solve from dose or from final beverage yield.

Ratio is a planning control, not a guarantee of flavor. Grind size, agitation, contact time, roast level, water chemistry, and brewer design still decide whether the recipe tastes clear, sweet, harsh, or flat.

How to Use This Tool

Choose whether to start from a known coffee dose or from a target beverage volume.
Select a brew method so the calculator can load a practical starting ratio, absorption estimate, temperature, and brew time.
Enter the dose or beverage target, then choose the ratio you want to test.
Adjust absorption, tablespoon weight, bloom ratio, roast level, water temperature, or brew time when your setup differs from the preset.
Use the batch ladder and charts to scale the recipe without changing the intended ratio.

Interpreting Results

Brew water is the total water poured into the recipe. Final beverage yield is the expected liquid after the grounds retain water. Bloom water is included inside the total brew water, not added on top. Servings use the cup-size field, so a larger mug changes serving count without changing the brew math.

Coffee water ratio interpretation guide
Ratio pattern	Result cue	Adjustment idea
Below method range	More concentrated than the preset expects.	Use more water or less coffee if the cup is heavy.
Inside ideal window	Close to a common starting point for the method.	Dial in flavor with grind, contact time, and agitation.
Above method range	Lighter than the preset expects.	Use less water or more coffee if the cup is thin.
High absorption setting	More water is expected to stay in the grounds.	Increase brew water when final beverage yield is the priority.

The method gauge checks the selected ratio against the method window. The yield-split chart shows where the water goes: final beverage, retained water, and bloom as a planned portion of the pour.

Technical Details

The calculator treats hot brewed coffee as a water-balance problem. When the dose is known, total brew water equals dose multiplied by ratio. Retained water equals dose multiplied by the absorption estimate. Final beverage yield is total brew water minus retained water. When final beverage yield is known, the calculator solves backward by dividing the target beverage by ratio minus absorption.

Unit conversions are applied before the math. Coffee can be entered in grams, ounces, or tablespoons, with tablespoon weight editable. Beverage can be entered in milliliters, fluid ounces, or cups. For planning, grams of water and milliliters of beverage are treated as approximately equivalent, which is practical for recipe building.

Formula Core

Let C be coffee dose in grams, R the brew ratio, a the absorption ratio, W total brew water, and Y final beverage yield.

\begin{array}{lcl} Known dose: W & = & C \times R \\ Retained water: A & = & C \times a \\ Final yield: Y & = & W - A \\ Target yield: C & = & \frac{Y}{R - a} \\ Bloom water & = & \min (W, C \times b) \end{array}

Selected coffee ratio method presets
Method	Default ratio	Method window	Default absorption
Pour-over / drip	1:16	1:15 to 1:17	2.1 g water per g coffee
French press	1:15	1:13.5 to 1:15.5	1.4 g water per g coffee
AeroPress	1:14	1:12 to 1:16	1.3 g water per g coffee
Cold brew concentrate	1:7	1:5 to 1:8	2.3 g water per g coffee

The page warns when ratio, temperature, bloom, batch size, or absorption values fall outside practical ranges. It also checks that ratio remains greater than absorption when solving from a target beverage yield.

Worked Examples

Coffee ratio worked examples
Goal	Calculation	Result
20 g pour-over at 1:16 with 2.1 absorption	320 g brew water; 42 g retained.	About 278 mL final beverage before serving losses.
300 mL target beverage at 1:16 with 2.1 absorption	300 / (16 - 2.1) = 21.6 g coffee.	About 345 g brew water.
Cold brew concentrate, 80 g coffee at 1:7	560 g brew water; absorption removes about 184 g.	About 376 mL concentrate before filtration losses.

FAQ

Is bloom water extra water?

No. Bloom water is part of the total brew water. The calculator caps it so the bloom amount cannot exceed the total planned water.

Why does a 1:16 recipe not yield the full water amount?

Wet grounds hold water. The absorption setting estimates that retained water and subtracts it from final beverage yield.

Can I use tablespoons?

Yes, but weight is more repeatable. If you use tablespoons, set the grams-per-tablespoon value to match your grind and scoop.

Glossary

Brew ratio: The grams of water planned for each gram of coffee, commonly written as 1:16 or similar.
Absorption: The water expected to remain in the wet grounds after brewing.
Final beverage yield: The liquid expected to reach the cup or server after retained water is subtracted.
Bloom water: The first pour amount, included within total brew water.
Batch ladder: A scaled set of recipe sizes that keeps the same ratio and absorption assumptions.