Stock Position Size Calculator
Calculate a safe share quantity from account size, risk percent, entry price, and stop-loss. See dollar risk, risk per share, and position value instantly.
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What is Stock Position Size Calculator?
The Stock Position Size Calculator converts your risk rules into an exact share quantity: account size times risk percent becomes the dollar risk, divided by the distance between entry and stop-loss, floored to whole shares - with position value and risk per share shown alongside.
Key Benefits
- Never oversize a trade beyond your risk percent again
- Works identically for long and short setups
- Dollar risk, per-share risk, and position value in one result
- Instant, private math for any market and currency
Common Use Cases
- •Sizing entries before placing stock orders
- •Comparing how tighter stops increase share quantity
- •Auditing a portfolio for oversized positions
- •Teaching new traders the fixed-fractional risk model
- •Planning swing trades around earnings volatility
Size a Stock Position
- Enter your account size: Type the trading capital you are willing to put at risk, not your net worth.
- Set the risk percent: Most traders risk one to two percent per trade - the dollar risk is computed from this.
- Add entry and stop-loss: Enter the planned entry price and the stop-loss. The distance between them is your risk per share.
- Read the share quantity: The calculator floors the result to whole shares and shows the dollar risk and position value so you can confirm the trade fits your account.
Key Features
- Position sizing from account size and fixed risk percent
- Stop-loss distance works for long and short trades alike
- Dollar risk, risk per share, and position value shown together
- Flags stops equal to entry instead of dividing by zero
- Fractional shares floored to whole share quantity
- Instant client-side results - nothing sent anywhere