Borgmann Aquaponics Hydroponics
🌱 EC/TDS/PPM Converter
Hydroponics & Plant Nutrition Unit Converter
Base Conversions
ℹ️ Note: TDS/PPM conversion is approximate and depends on ion composition.
Mole Calculator (Fertilizer Salts)
ℹ️ Note: EC value depends on ionic strength and conductivity. This calculation only shows the mass/mole relationship.
Example conversions for EC = 1.0 mS/cm:
| Unit | Value |
|---|---|
| S/cm | 0.001 |
| mS/cm | 1.00 |
| µS/cm | 1000 |
| CF | 10 |
| mho/cm | 0.001 |
| mho/m | 0.1 |
| ppm (640 factor) | 640 |
Overview: Common TDS conversion factors
| Factor | PPM = EC × Factor | Typically used in | Comment |
|---|---|---|---|
| 500 | NaCl factor | USA (Hanna), older devices | Typical for drinking water analysis |
| 640 | 442 factor | Europe, Canada, industry | Mixture of 40% Na₂SO₄, 40% NaHCO₃, 20% NaCl |
| 700 | KCl factor | Australia, Bluelab, USA (in part) | Typical for fertilizer solutions |
Why these differences?
- EC measures conductivity – is universal (in mS/cm).
- TDS is an approximate value in mg/L (ppm), based on a chemical assumption.
- Device manufacturers define the factor differently, depending on the salt mixture used for calibration.
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