Position Size Calculator
Sizes a trade from your stop-loss and the risk you accept.
Position size (shares)
—
Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
Amount at risk —
Position value —
Share of account — %
Reading this —
The formula
shares = account × risk % ÷ |entry − stop|
The size is set by what you can afford to lose, and not by how much you want to buy.
What to watch out for
Trading can lose money quickly. This does the arithmetic and says nothing about whether a trade is a good idea.
Frequently Asked Questions
How do I calculate position size?
Divide the amount at risk by the gap to your stop. 1% of 20,000 is 200; with the stop 3 away that is 66 shares.