Stock Position Size Calculator Excel Download
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Reviewed by Calculator Editorial Team
This stock position size calculator helps traders determine the optimal number of shares to buy based on their account size, risk tolerance, and stop-loss distance. The calculator also provides an Excel template for tracking your trades and position sizing.
How to Use This Calculator
To calculate your stock position size:
- Enter your account balance in the "Account Size" field.
- Select your risk tolerance percentage (typically 1-3%).
- Enter the stop-loss distance in dollars.
- Click "Calculate" to see your recommended position size.
The calculator will show you how many shares you can afford to buy while keeping your risk within your tolerance level. You can also download the Excel template to track your trades and position sizing over time.
Formula Used
Position Size Formula
The position size is calculated using the following formula:
Position Size = (Account Size × Risk Tolerance) / Stop-Loss Distance
Where:
- Account Size - Your total trading account balance
- Risk Tolerance - Percentage of your account you're willing to risk per trade (typically 1-3%)
- Stop-Loss Distance - The price difference between your entry and stop-loss orders
This formula helps ensure you're not risking more than you can afford to lose on any single trade.
Worked Example
Let's say you have a $10,000 account, you're willing to risk 2% per trade, and your stop-loss is 50 points below your entry price.
Account Size: $10,000
Risk Tolerance: 2%
Stop-Loss Distance: $50
Position Size: (10,000 × 0.02) / 50 = 4 shares
This means you can buy up to 4 shares while keeping your risk at 2% of your account.
Best Practices for Position Sizing
1. Start Small
Begin with smaller position sizes to get comfortable with the trading process before increasing your exposure.
2. Use Stop-Loss Orders
Always set stop-loss orders to limit your potential losses. The calculator helps you determine how many shares you can afford to buy while keeping your risk within your tolerance level.
3. Diversify Your Portfolio
Don't put all your money into a single stock. Diversify your portfolio to spread risk across different assets.
4. Review Your Trades
Regularly review your trading performance and adjust your position sizing strategy as needed.
5. Keep Emotions in Check
Avoid making impulsive trades based on fear or greed. Stick to your position sizing plan.
FAQ
What is position sizing in trading?
Position sizing refers to determining how much of your trading capital to risk on any single trade. Proper position sizing helps manage risk and protect your account from significant losses.
How do I calculate my position size?
Use the formula: Position Size = (Account Size × Risk Tolerance) / Stop-Loss Distance. This calculator automates this calculation for you.
What is a good risk tolerance percentage?
Most traders use a risk tolerance between 1% and 3% per trade. Beginners might start with 1%, while more experienced traders may use up to 3%.
Can I use this calculator for options trading?
This calculator is designed for stock trading. For options trading, you'll need to consider additional factors like premium paid and potential losses.
How often should I review my position sizing?
Review your position sizing strategy at least once a month, or whenever you notice your trading performance is declining.