| SPI Value Range | Drought and Flood Level |
| SPI ≤−2.0 | Extremely drought |
| −2.0 < SPI ≤−1.5 | Heavy drought |
| −1.5< SPI ≤−1.0 | Drought |
| −1.0 < SPI < 1.0 | normal |
| 1.5 > SPI ≥ 1.0 | Waterlog |
| 2.0 > SPI ≥ 1.5 | Heavy Waterlog |
| SPI ≥ 2.0 | Extremely Waterlog |