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Position Size Calculator

Position sizing determines how many shares or units to trade based on how much of your account you're willing to risk — a core risk-management calculation for traders. Enter your numbers below.

FINANCE & INVESTING · CALCULATOR

Position Size Calculator

Dollar Risk $0.00
Risk Per Share $0.00
Position Size 0 shares

How to Use the Position Size Calculator

  1. Enter your total account size.
  2. Enter the percentage of your account you're willing to risk on this single trade (many traders use 1-2%).
  3. Enter your planned entry price.
  4. Enter your stop loss price — where you'd exit if the trade goes against you.
  5. Click "Calculate Position Size" to see how many shares/units to trade.

How Position Size Is Calculated

Position sizing works backward from your risk tolerance, not forward from how much you want to buy:

Dollar Risk = Account Size × Risk Percentage

Risk Per Share = |Entry Price − Stop Loss Price|

Position Size = Dollar Risk ÷ Risk Per Share

This ensures that if your stop loss is hit, you lose only the percentage of your account you decided in advance — regardless of how many shares you actually buy.

Frequently Asked Questions

What risk percentage should I use per trade?
Many traders and risk-management frameworks commonly reference 1-2% of account size per trade, though the right number depends on your strategy, risk tolerance, and overall portfolio approach.

Does this account for trading fees or slippage?
No — this is a base position-size calculation. Real-world execution may involve fees, slippage, or partial fills that affect your actual risk slightly.

Can I use this for options or futures instead of stocks?
The same risk-based logic applies, but you'd need to adjust for contract multipliers and leverage, which this calculator doesn't account for directly.

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Disclaimer: This calculator provides general mathematical estimates for educational purposes only and is not financial or investment advice. Trading involves risk of loss — consult a licensed financial advisor before making investment decisions.

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