Python help for math calculation (division)

[CrystalCowardin]

I'm very new to Python and am working in model builder right now.  I created a new field (Shp_Acs) and I want that field to calculate the area of the polygon in acres. I tried !shape.area@ACRES! and it doesn't bring back the correct value. 

I was using VB and the expression was [SHAPE_STAr] /43560.  SHAPE_STAr is a field in my table that has the area of the polygon in sq.ft.

[IanMurray]

I used !shape.area@acres! and it returned the proper acreage for my polygon features. 

[DarrenWiens2 · Accepted solution]

What is the data type of the field you are attempting to calculate into?

Also, is your feature class projected? From the field calculator help, regarding area tokens:

Using areal units on geographic data will yield questionable results as decimal degrees are not consistent across the globe.

[CrystalCowardin]

It's a double field.

I tried what you wrote above and it worked!  Thanks!