An overview of the Raster Math toolset

The Raster Math tools apply a mathematical function the input raster or rasters.

The arithmetic tools perform addition (Plus), subtraction (Minus), multiplication (Times), and division (Divide) between two inputs. The inputs can be rasters or numbers (as constant value rasters).

The remaining tools apply only to a single input raster and will either convert a floating-point raster to integer (Int) or an integer raster to floating point (Float).

Tool	Description
Divide	Divides the values of two rasters on a cell-by-cell basis.
Float	Converts each cell value of a raster into a floating-point representation.
Int	Converts each cell value of a raster to an integer by truncation.
Minus	Subtracts the value of the second input raster from the value of the first input raster on a cell-by-cell basis.
Plus	Adds (sums) the values of two rasters on a cell-by-cell basis.
Times	Multiplies the values of two rasters on a cell-by-cell basis.

Tools of the Raster Math toolset

A more comprehensive range of mathematical calculations (trigonometric, exponential, logical, and so forth) is available with the ArcGIS Spatial Analyst extension license.