Coffee Extraction Yield Calculator (TDS-Based)
Calculate your coffee's extraction yield percentage from TDS, dose, and beverage weight. See exactly where your brew sits on the brewing control chart.
What Are TDS and Extraction Yield in Coffee?
Total Dissolved Solids (TDS) measures the concentration of dissolved coffee compounds in your beverage — the percentage of your cup that is actual coffee rather than water. A typical brewed coffee has a TDS between 1.15% and 1.45%, while espresso ranges from roughly 7% to 12%. TDS is measured with a refractometer — a small optical instrument that reads the refractive index of a liquid sample and converts it to a percentage.
Extraction yield (EY) tells you what percentage of the dry coffee's soluble mass actually ended up in your cup. Coffee beans contain roughly 28–30% soluble material by weight. The Specialty Coffee Association considers an extraction yield of 18% to 22% the ideal range for brewed coffee — this window maximizes sweetness and flavor complexity while avoiding sour under-extraction (below 18%) or harsh, bitter over-extraction (above 22%).
The relationship between TDS, dose, and beverage weight follows a simple formula:
Extraction Yield (%) = (TDS × Beverage Weight) ÷ Dose × 100
Enter your numbers below and see where your brew lands on the brewing control chart.
Calculate Extraction Yield
Enter your refractometer TDS reading, coffee dose, and beverage weight
Extraction Yield Zones & What They Mean for Taste
The table below explains what happens to flavor as extraction yield moves through different zones. These ranges apply primarily to brewed coffee (pour over, drip, French press). Espresso follows the same formula but has different TDS and strength targets — see the notes below the table.
| EY Range | Zone | Taste Characteristics | Common Causes | How to Fix |
|---|---|---|---|---|
| Below 18% | Under-extracted | Sour, sharp, thin body, grassy or undeveloped, lacking sweetness | Grind too coarse, water too cool, brew time too short, channeling | Grind finer, raise water temperature, extend brew time, improve puck prep |
| 18% – 20% | Ideal (lower end) | Bright acidity, clear origin flavors, clean finish, moderate sweetness | — | Fine-tune ratio or grind for personal preference |
| 20% – 22% | Ideal (upper end) | Peak sweetness, balanced acidity, full body, complex aftertaste | — | Maintain consistency — this is the target window |
| Above 22% | Over-extracted | Bitter, astringent, dry mouthfeel, ashy or burnt, hollow flavor | Grind too fine, water too hot, brew time too long, excessive agitation | Grind coarser, lower water temperature, shorten brew time, stir less |
Espresso note: Espresso TDS typically ranges from 7% to 12%, and some baristas push extraction yields to 23–24% with light roasts under turbo-shot profiles. The 18–22% SCA guideline is primarily calibrated for filter coffee — use it as a reference, not an absolute rule, for espresso.
Why Measuring Extraction Matters More Than Guessing
Taste is subjective, but extraction yield gives you an objective anchor point. Two people may disagree about whether a shot tastes good, but neither can argue with a refractometer reading that says 16% of the available solids ended up in the cup.
Measuring extraction lets you repeat success. When a shot tastes incredible, recording the dose, yield, shot time, and TDS means you can reproduce it tomorrow — and troubleshoot what changed when it drifts. It also lets you isolate variables: if you grind one notch finer and see EY go from 19.5% to 21.2%, you know exactly what that grind change did to your extraction.
Professional baristas use TDS/EY measurement routinely during competition prep, quality control, and recipe development. A VST or DiFluid refractometer (starting around $100–$150 for consumer models) is the most precise tool for home use.
Want to Dial In Your Espresso Ratio?
Use our dedicated dial-in calculator to find your target yield, get grind-adjustment tips based on shot time, and understand ristretto vs. normale vs. lungo.
Open the Espresso Dial-In Calculator →Frequently Asked Questions About Extraction Yield
For espresso, most specialty baristas target an extraction yield between 18% and 22%, the same SCA guideline used for filter coffee. However, modern light-roast espresso techniques (turbo shots, longer ratios) can push EY to 23–24% while still tasting clean and sweet. The ideal depends on the bean, roast level, and your taste preference — use the 18–22% window as a starting reference and adjust from there.
Yes — TDS is the one input you cannot estimate or derive without a refractometer. Consumer-grade coffee refractometers like the DiFluid R2 Extract (around $100) or the VST CoffeeTool LAB III (around $700 for professional precision) measure TDS by analyzing a small drop of brewed coffee. Without a refractometer, you can still dial in by taste, shot time, and ratio — but you cannot calculate extraction yield numerically.
TDS (Total Dissolved Solids) measures how concentrated your beverage is — the percentage of your cup that is dissolved coffee compounds versus water. Extraction yield measures how much of the dry coffee's available soluble material actually made it into the cup. Two shots can have the same TDS but very different extraction yields if the dose and beverage weight differ. TDS tells you about strength; EY tells you about how thoroughly you extracted the grounds.
Bitterness at 21% EY — still technically within the ideal window — usually means uneven extraction rather than total extraction being too high. Channeling (water finding fast paths through the puck) causes some areas to over-extract while others under-extract, producing bitterness even when the average EY reads as ideal. Improve puck prep: distribute grounds evenly, use a WDT tool, and tamp level. If bitterness persists, try a slightly coarser grind or a shorter ratio (1:1.8 instead of 1:2).
The standard formula is: Extraction Yield (%) = (TDS × Beverage Weight) ÷ Dose. TDS is expressed as a decimal (e.g., 9% = 0.09), beverage weight is the liquid in your cup in grams, and dose is the dry coffee weight in grams. For example, 18 g dose, 36 g beverage, 9.5% TDS: EY = (0.095 × 36) ÷ 18 = 19.0%. This formula is used universally across the specialty coffee industry.
Absolutely — the formula is identical for all brew methods. The only difference is typical TDS ranges: filter coffee usually reads 1.15–1.45% TDS, while espresso is 7–12%. Enter your filter brew's dose, beverage weight, and TDS reading from a refractometer, and the calculator will output your extraction yield. The 18–22% ideal window applies equally to pour over, French press, AeroPress, and drip — it was originally defined for filter coffee by the SCA.
Last updated: August 18, 2026 · Formula and zones verified against SCA and Barista Hustle extraction standards