DAX Help - Current Month * 12

Hi Guys, 

I'm trying to create the following formula (YTD Leavers / FY month we are in * 12) / YTD AVR Headcount

I have created the [YTD Leavers] & [YTD AVR Headcount] measures but am not sure how to create the

[FY month we are in * 12]

I have a dedicated calendar table with month names and month numbers, our FY starts in September so its month 1 

how can I have a measure that returns the month number based on the month that we are in multiplies that with 12 and returns value?

Thanks,

Kris