EC / TDS / PPM Converter

Convert between Electrical Conductivity and Parts Per Million

Enter value

Unit

EC (mS/cm)

PPM 500

PPM 640

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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