NDVI from CIR

Md_Abdullah_All_Sourav

I have given a CIR imagery of a field where Band 1 is NIR, Bang 2 is Red and Band 3 is Green. I need to calculate the NDVI. Previously, I have calculated the NDVI using NIR and Red with raster calculator where they came in different tif file. But, in this case, both NIR and Red is inside one imagery. 

DanPatterson_Retired

What do you normally use? and what software? for example in pro

http://pro.arcgis.com/en/pro-app/help/data/imagery/ndvi-function.htm