Position Size Calculator

Calculate the optimal position size for any trade.

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Position Sizing

Enter your account size, entry price, and stop loss.

Recommended position size
0 shares
Position value: $0

Worked example

With the default inputs shown below, this calculator returns the following results:

InputValue
Account size ($)$50,000
Risk per trade (%)1%
Entry price ($)$150
Stop loss price ($)$140
ResultValue
Recommended position size50 shares

Values shown are produced by this page in your browser; change any input to update them.

How to use the Position Sizing

  1. Account size ($) — default $50,000
  2. Risk per trade (%) — default 1%
  3. Entry price ($) — default $150
  4. Stop loss price ($) — default $140
  5. Press Calculate to update the results instantly.

Frequently asked questions

Risk amount divided by the distance to your stop. With a 1% risk on a $50,000 account and a $2 stop, you buy 250 shares.
Most traders risk 0.5-2% of the account. Above 3% a losing streak of five trades can cut the account by 15% or more.
Because position size determines survival. Fixed fractional sizing keeps each loss the same relative size, so no single trade can end your account.

Sources & references