Position-size calculator
It's not your entry price that decides your survival, it's the size of your position. This flips the usual order: set the risk first, then derive the share count from it.
This calculator says nothing about whether a trade is a good idea. It only limits what a single mistake can cost.
The full explanation is in the lesson Calculating position size.
Frequently asked questions
What's the basic formula for share count?
The allowed loss in currency divided by the distance between entry and stop per share.
What happens if you set the stop tight just to make the position bigger?
The position is highly likely to get stopped out by normal fluctuation.
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