Quick answer
Extraction yield = brewed beverage weight × TDS ÷ coffee dose. A 20 g dose that yields 300 g of coffee at 1.35% TDS has an extraction yield of 20.25%.
Enter the coffee dose, the beverage weight and the TDS percentage. The calculator returns the extraction yield.
Related tools: Coffee Brew Ratio Calculator: Coffee-to-water ratio and grams per liter. Tea Ratio Calculator: Tea leaf per amount of water. Percent Yield Calculator: Percent yield of a reaction.
How to use the Coffee Extraction Yield Calculator
- Enter coffee dose (g) (above 0).
- Enter beverage weight (g) (above 0).
- Enter tDS (%) (above 0).
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Coffee dose | A number, in g | > 0 |
| Beverage weight | A number, in g | > 0 |
| TDS | A number, in % | > 0 |
Formula and method
Formula
extraction yield = beverage weight × TDS ÷ dose
IEEE-754 double precision; shown to the decimals indicated.
TDS is measured with a refractometer.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Coffee dose = 20; Beverage weight = 300; TDS = 1.35.
| Result | Value |
|---|---|
| Extraction yield | 20.25% |
Example 2
Inputs: Coffee dose = 18; Beverage weight = 36; TDS = 9.
| Result | Value |
|---|---|
| Extraction yield | 18% |
Example 3
Inputs: Coffee dose = 15; Beverage weight = 250; TDS = 1.4.
| Result | Value |
|---|---|
| Extraction yield | 23.33% |
The first line is the headline result (extraction yield). IEEE-754 double precision; shown to the decimals indicated.
What it means
Extraction yield is the share of the coffee's mass dissolved into the cup. Specialty-coffee guidance often targets 18 to 22%. Below that is often sour (under-extracted) and above it bitter.
Measure correctly
Use the weight of the brewed beverage in the cup, not the water poured in, since the grounds retain some water. TDS comes from a refractometer reading in percent.
How the result changes with coffee dose
Holding every other input at the first worked example, this table changes only coffee dose. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Coffee dose | Extraction yield |
|---|---|
| 10 | 40.5% |
| 20 | 20.25% |
| 40 | 10.13% |
| 80 | 5.06% |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Coffee dose: entering "0" shows "Coffee dose must be greater than 0." beside that field and no result.
- TDS: entering "0" shows "TDS must be greater than 0." beside that field and no result.
Choosing between the Coffee Extraction Yield Calculator and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Coffee Brew Ratio Calculator](/cooking/coffee-brew-ratio-calculator/) | coffee and water | Brew ratio |
| [Tea Ratio Calculator](/cooking/tea-steeping-ratio-calculator/) | tea leaf and water | Ratio |
| [Percent Yield Calculator](/science/percent-yield/) | actual yield and theoretical yield | Percent yield |
| [Yield to Maturity Calculator](/finance/yield-to-maturity-calculator/) | market price, face value and annual coupon rate | Yield to maturity |
| [Dividend Yield Calculator](/finance/dividend-yield-calculator/) | annual dividend per share and share price | Dividend yield |
Background: cooking measurements
For baking, weight is more reliable than volume. A cup holds a fixed volume but its weight depends on the ingredient's density, and a cup of flour can vary by 20 to 30 grams depending on how it is scooped, so published gram-per-cup values for the same ingredient differ from site to site. Spoon and level flour if you must measure by volume.
Check which cup a recipe uses: the US cup is 236.588 mL, while a metric cup is 250 mL.
Assumptions and limitations
- Brewed beverage weight, not water in
Cooking times are guides. Use a food thermometer to confirm safe internal temperatures.
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for coffee dose and tDS to confirm this.
Frequently asked questions
What TDS is typical for filter coffee?
About 1.15 to 1.45%.
How do I raise extraction?
Grind finer, brew hotter or longer.
Do I need a refractometer?
Yes, to measure TDS.
What does the Coffee Extraction Yield Calculator calculate?
Extraction yield from dose, beverage weight and TDS. It returns Extraction yield.
What formula does the Coffee Extraction Yield Calculator use?
extraction yield = beverage weight × TDS ÷ dose. TDS is measured with a refractometer.
What do I need to enter in the coffee Extraction Yield Calculator?
You enter Coffee dose (g), Beverage weight (g) and TDS (%).
How is the result rounded or limited?
IEEE-754 double precision; shown to the decimals indicated. Brewed beverage weight, not water in.
What is an example of a coffee Extraction Yield result?
With coffee dose 20, beverage weight 300 and tDS 1.35, the extraction yield is 20.25%.
Where does the method come from?
The method follows: Coffee Brewing Control Chart (Lockhart; SCAA/SCA).
Can I rely on this calculator for a decision?
Cooking times are guides. Use a food thermometer to confirm safe internal temperatures. For this calculator in particular: Brewed beverage weight, not water in.
Related calculators
- Coffee Brew Ratio Calculator — Coffee-to-water ratio and grams per liter.
- Tea Ratio Calculator — Tea leaf per amount of water.
- Percent Yield Calculator — Percent yield of a reaction.
- Yield to Maturity Calculator — Yield to maturity of a coupon bond from its market price.
- Dividend Yield Calculator — Annual dividend as a percentage of the share price.
- Rental Yield Calculator — Gross and net rental yield on a property.
Sources
- Coffee Brewing Control Chart (Lockhart; SCAA/SCA)
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.