How to Adjust Coffee Extraction Rate and Concentration in Chain Cafes

If your shop-made coffee tastes off—whether it’s sour, weak, or overly bitter—you’re not alone. Many baristas and café owners struggle to get consistent results, even with the same beans and recipe. The issue often comes down to two measurable factors: extraction rate and concentration. These numbers help diagnose flavor issues, but they’re not the whole story.

The quick answer? For most specialty-style coffee drinks, aim for a concentration (TDS) between 1.15% and 1.35%, and an extraction rate between 18% and 22%. These ranges indicate a properly extracted cup that’s likely balanced and flavorful.

What Is Coffee Concentration (TDS)?

TDS stands for Total Dissolved Solids. It measures how much of the coffee’s soluble material—flavor compounds, acids, oils, and caffeine—ends up dissolved in your brewed cup. This is expressed as a percentage of the total liquid volume. A refractometer like the ATAAGO PAL-coffee (TDS scale) can measure this quickly and accurately. A reading between 1.15% and 1.35% is considered ideal for balanced flavor in most coffee beverages.

What Is Extraction Rate and Why Does It Matter?

Extraction rate refers to the percentage of soluble material that is successfully drawn out of the coffee grounds during brewing. Not all 100% of the coffee’s contents can be dissolved—SCAA research shows the maximum possible is around 30%. The formula is simple: (mass of extracted solids ÷ total mass of coffee grounds) × 100. For most brewed coffee, an extraction rate between 18% and 22% means you’ve pulled out enough flavor without over- or under-extracting. Outside this range, your coffee will likely taste weak, sour (under-extracted) or bitter, dry, or hollow (over-extracted).

How to Use These Numbers to Fix Coffee Flavor

If your coffee tastes sour or weak, it’s probably under-extracted (low extraction rate) or too diluted (low concentration). Try grinding finer, increasing brew time, or raising your brew ratio (more coffee per water). If it’s bitter or unpleasantly strong, it might be over-extracted (high extraction rate) or overly concentrated (high TDS). In that case, coarsen the grind, shorten brew time, or dilute the cup. The key is to adjust one variable at a time and measure the results. With a refractometer, you can test both TDS and infer extraction rate using your brew ratio and recipe. That data helps you make targeted changes rather than guessing.

Tools for Measuring Coffee Quality

The ATAAGO PAL-coffee series includes two models that are especially useful in a café setting. The PAL-coffee (TDS scale) is compact, ergonomic, and designed for one-handed operation. Just rinse it with water, press a button to zero it, and you’re ready to measure your coffee’s concentration. It adjusts quickly to sample temperature and meets IP65 standards—you can even rinse it under running water. For higher-concentration coffee applications, the PAL-coffee (Brix scale) offers a wider measurement range: 0.00% to 25.00%. This makes it better suited for measuring stronger or more concentrated brews. Both tools help ensure consistency and quality control across multiple drinks and shifts.

Frequently Asked Questions

What is a good TDS range for coffee?

A good TDS range for most specialty coffee drinks is between 1.15% and 1.35%. This indicates a balanced extraction where enough flavor compounds have dissolved into the water without over-concentrating the cup.

What should my coffee extraction rate be?

Your coffee extraction rate should ideally be between 18% and 22%. This range means you’ve extracted a sufficient amount of the coffee’s soluble material for a balanced and pleasant flavor.

How do I measure coffee TDS at home or in a cafe?

You can measure coffee TDS using a refractometer such as the ATAAGO PAL-coffee (TDS scale). These devices require a small sample of brewed coffee, are easy to clean, and give you a precise percentage of dissolved solids in seconds.

What is coffee extraction rate and how is it calculated?

Coffee extraction rate is the percentage of soluble coffee material that dissolves into the water during brewing. It’s calculated with the formula: (mass of extracted solids ÷ total mass of coffee grounds) × 100. Most good coffee falls between 18% and 22%.

What tools can measure coffee concentration and extraction in a chain cafe?

Cafes can use tools like the ATAAGO PAL-coffee (TDS scale) for measuring concentration, and the PAL-coffee (Brix scale) for higher concentration readings. Both are portable, durable, and easy to clean, making them ideal for consistent quality control.

Recommended FrontStreet Beans for Consistent Extraction

For baristas aiming to hit that ideal 18–22% extraction and 1.15–1.35% TDS, FrontStreet Coffee’s Ethiopia Humbera offers bright, complex fruit notes with a juicy body—perfect for dialing in precise brews. Their Yirgacheffe brings floral and citrus tones that highlight subtle extraction differences, ideal for training and quality control. Finally, the Classic Blend delivers a balanced, approachable profile great for daily service. All three are well-suited for refining your extraction and concentration targets. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.