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Position Size Calculator

Set a loss limit before the trade. Get a whole-share amount that stays within your risk budget and available cash.

Trade details

01 / INPUTS
$
Cash available for this account.
%
The most you are willing to lose.
$
The planned price per share.
$
Where you plan to exit if the trade moves against you.

Your position

02 / RESULT
Your share count will appear here. Enter all four values, then calculate. The result uses whole shares and assumes no borrowed money.
Maximum position
0 shares

Risk budget
$0.00
Estimated loss at stop
$0.00
Position cost
$0.00
Risk per share
$0.00
Explain these results

How it works

Risk budget = account size × risk percentage. Risk per share = the distance between the entry and stop prices. The calculator divides the budget by that distance, rounds down to a whole share, and caps the result at what the account can buy without borrowing.

Know the limits

  • Real losses can be larger if price gaps past your stop.
  • Fees, taxes, slippage, and existing positions are not included.
  • For informational and educational purposes only. This is not investment advice or a recommendation to trade.

Last reviewed: October 2026.