If i sum up result of my individual trade using calculator facilitated by you and the amount i received their is difference of 0.82 paise
If you notice the brokerage calculator is calculation upto three decimal while back office has to round it off at two decimal figures. Different account head like Stamp/transaction/service tax gets rounded off, hence there will be some difference. But this difference does not escalate with volume. So you may se some variation from brokerage calculator varying between 5 paise to a rupee or so.
All this benefit of rounding off goes towards various taxes only as our brokerage is in round figure of Rs 10/-
best wishes,
team VPS