How convert between umhos/cm and mmhos/cm
1000 umhos/cm = 1 mmhos/cm
To use the table below, convert your units to mmhos/cm by dividing your reported result by 1000.
Interpreting EC data from soil extracts (1:2 soil-to-water ratio).
| Electrical Conductivity (mmhos/cm) |
Rating | Interpretation |
| 0-0.15 | Very low | Plants may be starved of nutrients. |
| 0.15-0.50 | Low | If soil lacks organic matter. Satisfactory if soil is high in organic matter |
| 0.51-1.25 | Medium | Okay range for established plants. |
| 1.26-1.75 | High | Okay for most established plants. Too high for seedlings or cuttings. |
| 1.76-2.00 | Very high | Plants usually stunted or chlorotic. |
| > 2.00 | Excessively high | Plants severely dwarfed; seedlings and rooted cuttings frequently killed. |
