TDS in coffee values measurement & perfect extraction

🔍 TDS in coffee: Meaning, measurement & perfect values for filter coffee and espresso

☕ TDS (Total Dissolved Solids) describes the amount of all dissolved solids in brewed coffee. The TDS value is a key, scientifically sound indicator of strength, balance, and sensory impression .

Understanding TDS allows for reproducible optimization of coffee – regardless of subjective taste.

🧪 What does TDS mean in coffee?

TDS indicates what percentage of the finished beverage consists of dissolved substances – including acids, sugars, bitter substances, caffeine and flavor components.

• TDS = Concentration / Strength of coffee
• Extraction rate = proportion of soluble substances that were dissolved from the coffee grounds.

Important: A high TDS value alone does not automatically mean good taste. It is a measurement tool for objectivity , not for evaluation without sensory testing.

📊 Ideal TDS values & sensory effect

☕ Filter coffee (V60, Pour Over, Batch Brew)

• 1.15–1.35% TDS → balanced, clear, complex
• < 1.1% → thin, underextracted
• > 1.4% → strong, potentially bitter

⚡ Espresso

• 8–12% TDS → concentrated, intense, full-bodied

⚙️ Factors influencing the TDS value

🛠️ Brewing parameters

• Brew ratio: more coffee → higher TDS
• Grind size: finer → faster extraction → higher TDS
• Brewing time: longer → more dissolved substances
• Temperature: hotter → higher solubility

💧 Why water TDS & minerals are crucial

Extraction doesn't begin with the coffee – it begins with the water . The water's total dissolved solids (TDS) value (ppm) and its chemical composition significantly determine how efficiently flavors are extracted. An excellent explanation is provided in the Barista Tools blog article "Water Quality - The Decisive Factor for Coffee Quality," which details how minerals such as calcium, magnesium, and bicarbonate influence extraction and their role in flavor, balance, and clarity.

You can find more barista tips about water, brewing techniques and coffee in the Coffee Knowledge Blog by barista.tools – including articles on extraction, tamping techniques and workflow in the café.

🧂 The role of individual minerals

• 🟦 Calcium (Ca²⁺): strengthens body and structure
• 🟩 Magnesium (Mg²⁺): promotes sweetness and fruitiness
• 🟨 Bicarbonate (HCO₃⁻): buffers acids and influences balance

A high TDS value in water isn't automatically better. A balanced mineral profile is crucial. If you want to improve your water quality, check out our measuring devices for precise control .

📊 Recommended water parameters

🔬 Measuring TDS: Devices & Methods

Refractometers measure coffee TDS via light refraction. Conductivity TDS meters primarily detect salts and are intended for water analysis. For precise measurements, refractometers and high-quality measuring instruments are recommended.

🔧 Product recommendations for TDS measurement & water analysis

☕ TDS-optimized recipes

If you want to systematically improve TDS values, measuring the extraction rate with a refractometer is a very good next step.

📌 V60

• 30 g coffee / 500 ml water
• 93 °C · 2:30–3:00 min
• Target TDS: 1.15–1.35%

📌 Aeropress

• 18 g coffee / 250 ml water
• 92 °C · 1:30–2:00 min
• Target TDS: 1.20–1.50%

📌 Espresso

• 18 g In · 30 ml Out
• 25–30 sec.
• Target TDS: 8–12%

❓ FAQ: TDS in coffee

What is more important: TDS or extraction rate?

Both values complement each other. TDS measures the strength, the extraction rate the efficiency of the solution.

What is the ideal TDS level in water?

75–250 ppm, often around 150 ppm for balanced results.

Do I need to measure TDS to brew good coffee?

No – but it helps enormously with consistency and error analysis.

✅ Conclusion

TDS is an objective, scientifically established parameter that helps to optimize coffee in a reproducible way. Combined with good water quality, appropriate brewing parameters, and sensory evaluation, TDS becomes a powerful tool for home baristas and professionals alike.