Future margin change as stock price change

hello,
i know that margin on future contract position change with stock price change…means if i take reliance future contract long then at entry margin can be 1 lak rs.
now if reliance stock go down 1% tomorow then my long future margin also increase some part…like it can become 1.2 lak rs. …like it increase 20%.

so any rough calculation of margin for part stock price chg… that if sotck move 0.5%,1%,1.5%,2%, n so on…then future margin will increase by a%,b%,c%,d%, n so on…

any rough calculation like above i m looking for
thx very much…

Read varsity modules on futures