For some of your questions - please read first page of this thread Frequently Asked Questions about the Signals service
About ROI calculation ... I remember 2 general ways of calculating ROI - I have no idea which way they are selected for Signals.
As to lot size so I do not have direct answer too ... I just remember the calculation of lot size which was written on some article :
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Metatrader 4 Signal Lot Size not copied?
newdigital, 2013.08.14 07:40
And there is some changes related to lot size/volume made in one of the build of Metatrader:
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Signals: Changed the algorithm for calculation of the copied deal's volume in case a Signal Source and a Subscriber have different leverages:
Current algorithm: A deal volume is changed in direct ratio to the correlation of a Signal Source's leverage with a Subscriber's one. It means that if a Signal Source having a leverage of 1:100 opens a deal of 1 lot, a Subscriber having a leverage of 1:500 will open a deal of 5 lots in case of 100% copying and a deposit matching by size and currency. A subscriber having a leverage of 1:10 will open a deal of 0.1 lots in similar conditions.
New algorithm: If subscriber's leverage exceeds the one of the Signal Source, it does not affect a volume of a copied deal. Otherwise, the deal volume is changed in direct ratio to the correlation of a Signal Source's leverage with a Subscriber's one.
It means that if a Signal Source having a leverage of 1:100 opens a deal of 1 lot, a Subscriber having a leverage of 1:500 will open a deal of 1 lot in case of 100% copying and a deposit matching by size and currency. A subscriber having a leverage of 1:10 will open a deal of 0.1 lots in similar conditions
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Metatrader 4 Signal Lot Size not copied?
newdigital, 2013.08.14 07:40
And the main page for subscribers to understand about which lot size they will have when subscribe - this one https://www.metatrader5.com/en/terminal/help/signals/signal_subscriber
Just for information.
and standard reply related to many cases :
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Can you change the ratio in which a signal is subscribed to?
angevoyageur, 2014.02.04 13:31
You have only 2 ways to act on the calculated ratio :
- Increase "% of deposit used" in Signals settings.
- Add more capital to your account.
About ROI calculation ... I remember 2 general ways of calculating ROI - I have no idea which way they are selected for Signals.
As to lot size so I do not have direct answer too ... I just remember the calculation of lot size which was written on some article :
and standard reply related to many cases :
Thank you, may be someone else have more information !
Forum on trading, automated trading systems and testing trading strategies
Signals : Ask & Say Anything & Everything About MQL5 Trading Signals
angevoyageur, 2014.03.28 12:57
Sorry, misunderstood.
From documentation. I never saw details about ROI on this site (I can miss it) :

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Hello,
I decided to give a little attention to signal subscribing. I have a few questions:
1-Can I change the lot size of the signal ?
2-How ROI is calculated ?
3-What AVG pips means; probably average pips, but how is calculated ?
Thanks in advance !