hello, how are you today, i hope well 
i just sign demo account and find misunderstanding about leverage and margin, i hope i can find help 
according to post on forex school about âForex Margin Call Explainedâ
if i have 1:100 leverage and equity 10000, and if i buy/sell 1 lot,my used Margin is now $100
ok, i have 1000$, 1:100 leverage, in my demo, i just test to sell 1 lot and, my used Margin is now $246
why my used margin is 246, not 10$
thank you
Hello,
From the definition âMargin is the amount of money needed as a âgood faith depositâ to open a position with your brokerâ, you can see that your margin is not your main balance. It is the amount required to open a certain trade. Leverage does affect your margin.
Source: Forex Leverage and Margin Explained
For example:
With a leverage of 1:500, you need about $246 to open EURUSD 1lot position. With a leverage of 1:100, you need about $1229 margin to open the same position. Required margin to open a certain position also depends on the currency pair and the current price of the currency pair. It is very easy for you to calculate this when you use a calculator here: Trading Strategy Calculator - Profiforex Forex Broker
The size of your deposit is irrelevant to the margin applied for the same currency pair using the same lot size. So if your balance is $1,000, $10,000 or $100,000 and you are buying 1.0 lot of currency pair xyz the margin required will be the same (not sure if made a type and forgot the third 0 or if you thought there is a difference).
The amount needed always depends on the currency pair you trade. For example selling 1.0 lot EURUSD and selling 1.0 lot NZDJPY will carry a different margin requirement.
thank @ Profiforex
thank @ TheLastBearâs
for reply 
I think I began to understand about margin & leverage 
