How to link formula to particular variable in SQL Querry

Question

Hi friends,

I have created 1 Formula Master. In which i have created list of formulas

For Eg: B 60/60 (Hob Cabinet)=Height*Depth

I have used foll querry to calculate calculation.

declare @Depth as numeric(18,2)

declare @Height as numeric(18,2)

declare @Area as numeric(18,2)

declare @Formula as varchar(100)

set @Depth=100

set @Height=100

Set @Formula=(Select Formula from [formula_master] where [name] = ('B 60/60 (Hob Cabinet)'))

select @Formula

if(@formula=(Select Formula from [@formula_master] where [name] = ('B 60/60 (Hob Cabinet)')))

begin

set @LPR=@formula

Select @LPR

end 

Plzzzz help me out.......