How to calculate percentage of a study area for land cover change?

[__17]

I'm trying to calculate percentage of the study area that's under land cover change from 2001 to 2011. Would I add a new field and then go to field calculator and divide NLCD2001 and NLCD2011 and multiply by 100? Or am I missing a step and have to do something else instead?

Does anyone know how I should do this? Thank you

[__17]

When I add the two fields one for y2001 and for y2011, do I choose float, double, long, or short integer?

[AbdullahAnter]

double or float

[AbdullahAnter]

I check it and it is right , also you can divide all by 10 ( time period ten years ) to get yearly change.

[__17]

Okay I think it is correct as well. However, I'm just trying to get one general percentage of the total study area under land cover change from 2001 to 2011. Do you know how I could do this?

Thanks!