Position Size Calculator
How many shares to buy so a stop loss only costs you a fixed share of your account.
Method
How it works
Choose how much of the account may be lost if the stop is reached. The calculator converts that percentage into a cash risk amount and divides it by the absolute distance between entry and stop.
The share count is rounded down to a whole number, which keeps the calculated position within the selected risk amount before fees and slippage.
Common questions
Frequently asked questions
Why is the share count rounded down?
Rounding down avoids exceeding the selected cash risk because fractional shares may not be available.
Can the stop be above the entry price?
Yes. The calculation uses the absolute difference between the two prices.
Does this include slippage or commissions?
No. Those costs can increase the actual loss beyond the displayed risk amount.
Not financial advice. This calculator is for general informational purposes only. Check figures independently before making financial decisions.