Calculate Power - Most Advanced UOC

create function fn_calc_uoc_power(@FromConversionUnit varchar(64),@ToConversionUnit varchar(64),@UnitValue float)
returns float
as
begin

--POWER
/*=========ACRONYM==========
BTU/m - British Thermal Unit per minute
FP/m  - Foot-Pound per minute
HP    - Horsepower
KW    - Kilowatt
W     - Watt

*/


declare @returnvalue float

select @returnvalue = 
case 
	when @FromConversionUnit = 'BTU/m' and @ToConversionUnit = 'FP/m' then @UnitValue * 778.1693709678747
	when @FromConversionUnit = 'BTU/m' and @ToConversionUnit = 'HP' then @UnitValue * 0.0235808900293295
	when @FromConversionUnit = 'BTU/m' and @ToConversionUnit = 'KW' then @UnitValue * 0.0175842666666667
	when @FromConversionUnit = 'BTU/m' and @ToConversionUnit = 'W' then @UnitValue * 17.58426666666667

	when @FromConversionUnit = 'FP/m' and @ToConversionUnit = 'BTU/m' then @UnitValue * 0.0012850672839464
	when @FromConversionUnit = 'FP/m' and @ToConversionUnit = 'HP' then @UnitValue * 3.030303030303029e-5
	when @FromConversionUnit = 'FP/m' and @ToConversionUnit = 'KW' then @UnitValue * 2.259696580552333e-5
	when @FromConversionUnit = 'FP/m' and @ToConversionUnit = 'W' then @UnitValue * 0.0225969658055233

	when @FromConversionUnit = 'HP' and @ToConversionUnit = 'BTU/m' then @UnitValue * 42.40722037023268
	when @FromConversionUnit = 'HP' and @ToConversionUnit = 'FP/m' then @UnitValue * 33000.00000000001
	when @FromConversionUnit = 'HP' and @ToConversionUnit = 'KW' then @UnitValue * 0.7456998715822702
	when @FromConversionUnit = 'HP' and @ToConversionUnit = 'W' then @UnitValue * 745.6998715822702

	when @FromConversionUnit = 'KW' and @ToConversionUnit = 'BTU/m' then @UnitValue * 56.86901927480627
	when @FromConversionUnit = 'KW' and @ToConversionUnit = 'FP/m' then @UnitValue * 44253.72895663593
	when @FromConversionUnit = 'KW' and @ToConversionUnit = 'HP' then @UnitValue * 1.341022089595028
	when @FromConversionUnit = 'KW' and @ToConversionUnit = 'W' then @UnitValue * 1000.0

	when @FromConversionUnit = 'W' and @ToConversionUnit = 'BTU/m' then @UnitValue * 0.0568690192748063
	when @FromConversionUnit = 'W' and @ToConversionUnit = 'FP/m' then @UnitValue * 44.25372895663593
	when @FromConversionUnit = 'W' and @ToConversionUnit = 'HP' then @UnitValue * 0.001341022089595
	when @FromConversionUnit = 'W' and @ToConversionUnit = 'KW' then @UnitValue * 0.001
								 
	when @FromConversionUnit = @ToConversionUnit then @UnitValue * 1.0
end	

return(@returnvalue)

end
go


--examples	
select dbo.fn_calc_uoc_power('BTU/m','FP/m',10)
select dbo.fn_calc_uoc_power('BTU/m','HP',10)
select dbo.fn_calc_uoc_power('BTU/m','KW',10)
select dbo.fn_calc_uoc_power('BTU/m','W',10)

select dbo.fn_calc_uoc_power('FP/m','BTU/m',10)
select dbo.fn_calc_uoc_power('FP/m','HP',10)
select dbo.fn_calc_uoc_power('FP/m','KW',10)
select dbo.fn_calc_uoc_power('FP/m','W',10)

select dbo.fn_calc_uoc_power('HP','BTU/m',10)
select dbo.fn_calc_uoc_power('HP','FP/m',10)
select dbo.fn_calc_uoc_power('HP','KW',10)
select dbo.fn_calc_uoc_power('HP','W',10)

select dbo.fn_calc_uoc_power('KW','BTU/m',10)
select dbo.fn_calc_uoc_power('KW','FP/m',10)
select dbo.fn_calc_uoc_power('KW','HP',10)
select dbo.fn_calc_uoc_power('KW','W',10)

select dbo.fn_calc_uoc_power('W','BTU/m',10)
select dbo.fn_calc_uoc_power('W','FP/m',10)
select dbo.fn_calc_uoc_power('W','HP',10)
select dbo.fn_calc_uoc_power('W','KW',10)