How to calculate Rate of return when doing intraday trades with MIS orders

How to calculate Rate of return when doing intraday trades with MIS orders.

Nov,2015 onwards the contract size has increased and the margin it requires is hefty. So it is very difficult for a small trader like me to trade in fno. To decide, whether to trade in fno or to concentrate on equities only, i need to calculate the returns i receive in fno trades. How to do that? Since i m squaring off the position intraday and with MIS product. i mean whether i should take turnover or Span+Exposure Margins for calculation?

Returns are always based on the capital deployed rather than the turnover generated. So yeah you can either do it SPAN+Exposure, or based on your entire trading capital.