Help please with this formular!

[danjuma]

I know how to calculate the lay stake for equal profit no matter the result whe trading. i.e. Lay stake = (back odds/lay odds) x back stake.

Say I was setting up a trade on a selection between two exchanges (i.e. back a selection at one exchange, and lay same selection at a different exchange). How would I calculate the lay stake, taking into consideration the commission rates at the two exchanges?

Many many thanks in advance.

[danjuma]

Looks like nobody can assist! Thanks anyway.

[orange]

I use a calculator on here

http://www.arbcruncher.com/sports_trading_examples.asp

click on the "open back/lay calculator"

You can play with the figures and change comm rate or work it out to a total stake.

Hope this helps, I know you probably wanted to know how to do the calculation but this help in the meantime.

[rugbygav]

Does anyone have an excel version of the arbcruncher "open back/lay calculator" or know how calculate it in excel?