Room Inner wall paint area calculation

How to Check Inner Wall Area :

1. Room parameter in meter (3+4+3+4=14 meter)
2. Room Inner wall height [3.05 meter – slab (.15 meter thick)= 2.9 meter]
3. deduct door area (1 meter length x door height 2.15 meter = 2.15)
4. Deduct Window area (1.2 mt. length x 1.2 mt.window height)
5. then click on “Click Room Wall Area” and getting result you want.
6. Formulas is = {(Room Parameter x Room height) – (Door Area + Windows Area)}