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Position Size Calculator

Calculate how many shares to buy based on your risk tolerance

How to Use This Calculator

1. Enter Your Account Size

This is your total trading capital. For example, if you have $10,000 in your trading account, enter 10000.

2. Set Your Risk Percentage

Many professional traders risk 1-2% per trade. This means if you have a $10,000 account and risk 1%, you're willing to lose $100 on this trade.

โš ๏ธ Note: Risking more than 2% per trade is generally considered aggressive. This is for educational purposes only.

3. Enter the Stock Price

The current price of the stock you want to buy. For example, if AAPL is trading at $150.00, enter 150.

4. Set Your Stop Loss Distance

How far below your entry price will you exit if the trade goes against you? For example, if you buy at $150 and want to exit at $145, your stop distance is $5.

๐Ÿ’ก Common Practice: A 3% stop loss is frequently used for swing trading. On a $150 stock, that's $4.50.

Example Calculation

Scenario: You have a $10,000 account and want to buy a stock trading at $150. You'll set your stop loss at $145 (a $5 risk per share).

Account Size: $10,000
Risk Per Trade: 1% = $100
Stock Price: $150
Stop Loss: $145 (risk of $5 per share)
โ†’ Shares to Buy: $100 รท $5 = 20 shares
โ†’ Total Investment: 20 ร— $150 = $3,000
โ†’ If stopped out: Loss of $100 (1% of account)

This demonstrates how position sizing limits losses to a predetermined amount. For educational purposes only.

Understanding Position Sizing

Position sizing is widely considered a critical component of trading. Here's a comparison:

โŒ Without Position Sizing

Trader A risks 10% per trade. After 3 losses in a row, they're down 30%. They need a 43% gain just to break even. Recovery becomes challenging.

โœ… With Position Sizing

Trader B risks 1% per trade. After 3 losses in a row, they're down 3%. They need a 3.1% gain to break even. Recovery is more manageable.

Educational Note: Historical trading data suggests that proper position sizing can significantly impact long-term results, regardless of win rate.

Want Position Sizing Done For You?

MarketDly provides daily trading signals with position sizing calculated for your account size.