Came up with a little vbscript to help you calculate your lot size for better MM. It is based on mini lot and only applicable to currency pair where the quote currency is USD, example EUR/USD, GBP/USD, etc
Extract the following within the ++++++ and save it under a file say, mm.vbs
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Wscript.Echo "Enter Account(S$):"
Account = WScript.StdIn.ReadLine
Wscript.Echo "Enter Risk %(not more than 2%):"
Risk = WScript.StdIn.ReadLine
Wscript.Echo "Enter Stop Loss(pips):"
Stop_Loss = WScript.StdIn.ReadLine
Wscript.Echo "Enter Exchange Rate(USD/SGD):"
Exchange_Rate = WScript.StdIn.ReadLine
lot_size = ((Risk/100) * (Account/Exchange_Rate)) / Stop_Loss
Wscript.Echo "Lot Size(mini lot) = " & lot_size
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To execute, open a command prompt and type and enter cscript mm.vbs
You will be asked to enter your trading account (in Sing dollar), the amount you wanna risk(not more than 2%, enter without %), your stop loss (how many pips), and the exchange rate between USD and Sing dollar.
For example with a account of S$7000, risking 2%, with a stop loss of 40 pips and a usd/sgd exchange rate of 1.26, you mini lot size is ~2.8 ...