EC / TDS / PPM Converter
Convert between Electrical Conductivity and Parts Per Million
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EC (mS/cm)
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PPM 500
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PPM 640
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PPM 700
Typical EC Targets
| Stage | EC (mS/cm) |
|---|---|
| Seedlings / clones | 0.4 - 0.8 |
| Early vegetative | 0.8 - 1.2 |
| Vegetative | 1.2 - 2.0 |
| Flowering / fruiting | 1.4 - 2.4 |
| Finishing / flushing | 0.4 - 0.8 |
Note: PPM scales vary by meter manufacturer. The 500 scale is common in North America, 640 is used by Hanna instruments, and 700 is standard in Europe and Australia. Always check which scale your meter uses. EC (mS/cm) is the universal standard.
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