There is no any simple desicion for that. And as this question was asked many times so I am providing the reply by links -
----------------
1. How to Select a Deal Volume
https://www.mql5.com/en/forum/9950/page93#comment_4052813
https://www.mql5.com/en/forum/215636
2. How to change the volume/lot size (many posts)
https://www.mql5.com/en/forum/11714

How to Start with Metatrader 5
- 2017.02.01
- www.mql5.com
I decided to create this thread to help to myself and to the others to start with Metatrader 5...
medamine:
Hello Guys,
I'm trying to copy a signal of someone, but this person is opening orders of "0.01" in volume, but i need to copy the same signal with a "1" in volume instead of "0.01" is that possible ?
Thank you
Yes, you need the same or greater leverage and 100 times more balance (and a bit more actually, since you can only use up to 95% of it).

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Hello Guys,
I'm trying to copy a signal of someone, but this person is opening orders of "0.01" in volume, but i need to copy the same signal with a "1" in volume instead of "0.01" is that possible ?
Thank you