PPM to EC Calculator
Nutrient chart says 900 PPM, your pen reads EC. On the 500 scale, double it: ~1,800 µS/cm.
Calculator
PPM to EC Calculator
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Nutrient chart says 900 PPM, your pen reads EC. On the 500 scale, double it: ~1,800 µS/cm.
How to use this calculator
- Enter PPM (500 scale).
- Divide by 0.5 (same as ×2).
- Read EC in µS/cm.
The formula
Reverse of EC → PPM on the 500 scale.
What the units mean
PPM (parts per million) — one part of solute per million parts of the total mixture. The workhorse unit for trace concentrations in water, air, and food.
µS/cm — microsiemens per centimeter, the unit of electrical conductivity (EC) that meters actually measure before converting to a PPM estimate.
Worked example
Target 1,200 PPM → EC ≈ 2,400 µS/cm.
Quick reference
| PPM | EC (µS/cm) |
|---|---|
| 400 | 800 |
| 800 | 1,600 |
| 1,200 | 2,400 |
500 scale.
Where you will actually use this
Lets you set EC targets from PPM-based feeding charts.
- Feeding chart conversion
- Meter calibration checks
Mistakes that give wrong answers
- Wrong scale factor
Key takeaways
- Formula: EC (µS/cm) ≈ PPM × 2 (500 scale)
- Remember: 500 scale.
- Watch out for: Wrong scale factor
- Next step: run your own numbers in the calculator above, then verify with a measurement — calculated values are only as good as the inputs.
Frequently asked questions
How do you convert PPM to EC?
Multiply PPM by 2 on the 500 scale.