how to convert amount to lot?

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203

for Example:

I decide to use $28usd to be Initial margin for selling EURGBP ?

if mt4 acc. leverage = 500

I want the mql4 code : to calculate the lot =? lot


anyone can help?

THANKS

 
chiwing:
203

for Example:

I decide to use $28usd to be Initial margin for selling EURGBP ?

if mt4 acc. leverage = 500

I want the mql4 code : to calculate the lot =? lot


anyone can help?

THANKS

Hello,

can use this formula to calculate the maximum lot based free margin.

//For buy pos
AccountFreeMargin()/(AccountFreeMargin()-AccountFreeMarginCheck(Symbol(),OP_BUY,1))


//For sell pos
AccountFreeMargin()/(AccountFreeMargin()-AccountFreeMarginCheck(Symbol(),OP_SELL,1))
 
Formula is:

margin required = (contract size / leverage) * volume_min

possible volume = (your margin / margin required) * volume_min

Here combined:
possible volume = (your margin / ((contract size / leverage) * volume_min)) * volume_min


volume_min is given by the symbol.
IIt is bad practice to calculate your volume from required margin. 

your margin must be given in the margin currency of the symbol.You need to exchange it with the current quote between this currency and your account currency.
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