# How do you calculate EC from PPM?

Category:
science
chemistry

To obtain an approximate sodium chloride TDS value, multiply the

**EC**reading (in milliSiemens/cm) by 1000 and divide by 2. To get an**EC**value, multiply the**ppm**reading by 2 and divide by 1000. Thus, if your**EC**is 1: 1*1000/2= 500**ppm**.

Similarly, is EC the same as PPM?

**ppm** stands for **parts per million** & is the most common domestically used unit when measuring TDS. **EC** stands for electrical conductivity, which is a measurement of the ability of something to conduct electricity. In horticulture, **EC** is the most accurate way to measure nutrient concentration in solution.

**EC**is a measure of the salts in your system—that is, the level of nutrients in your system.

**EC should**be kept between 1.2 and 2.0.

**EC**and pH meters are affordable and often come as one dual meter. Haydn uses a Bluelab dual meter.

In this regard, how do you calculate ppm?

**Parts Per Million (ppm) Concentration Calculations**

- Write an equation representing the ppm concentration: ppm = mass solute (mg) ÷ volume solution (L)
- Extract the data from the question: mass solute (NaCl) = 0.0045 g.
- Convert the mass in grams to a mass in milligrams: mass NaCl = 0.0045 g = 0.0045 g × 1000 mg/g = 4.5 mg.

Total Dissolved Solids (TDS) is measured in milligrams per unit volume of **water** (mg/L) and also referred to as parts per million (**ppm**). For drinking **water**, the maximum concentration level set by EPA is 500 mg/L.