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How do I calculate the lot size?

When choosing the lot size for your trade, you may want to consider a few factors:

  1. The price levels (or number of pips) you want to set your Stop/Limit
  2. The amount of capital you wish to risk
  3. The amount of Usable Margin you have available to open new trades

Based on those factors you can calculate lot size. 

Trade sizes I can place?

FXCM APPS created a 'Risk Calculator', which will help you determine a LOT size to trade based on the parameters above.