TDS Calculator

Optimal TDS Readings For Different Brew Methods

For a pour-over dripper like Stagg [X] or Stagg [XF], the typical TDS measurement will be somewhere between 1.2-1.7 TDS. That’s right, your pour-over coffee is actually about +/- 98.5% water! For espresso-style shots with Prismo, we love the flavor most with TDS readings of 3.5-5.

Pour-Over: 1.2-1.5 AeroPress® Coffee Maker: 1.4-1.7 French Press: 1.4-1.7 Prismo: 3.5-5 Espresso: 8-12

Once you know the measured TDS, you can use a simple equation to determine the extraction percentage, which is the amount of coffee that it into your coffee.


Ex: 320 grams of brewed coffee x 1.43 TDS = 457.6 457.6 / 20 grams ground coffee weight = 22.88 22.88 = your extraction percentage