InnerSoft ISBH computes soil water balance and Thornthwaite Moisture Index (Im). User must input Precipitation and Potential evapotranspiration values for each month. Application outputs are Soil Moisture Storage, Change in Soil Moisture Storage, Actual evapotranspiration, Surplus, Deficit, Thornthwaite Moisture Index (Im), Humidity Index, Aridity Index Classification of Climates under Thornthwaite's 1948 System Moisture Categories.