Position Size Calculator
One of the biggest reasons traders blow up their accounts isn’t bad stock picks — it’s oversized positions. This free position size calculator tells you exactly how many shares to buy based on your total capital and how much you’re willing to risk on a single trade, so one bad trade never wipes out weeks of gains.
Position sizing is often called the most underrated skill in trading. Two traders can have the exact same entry and stop-loss, but the one using proper position sizing survives a losing streak, while the other risks their entire account on a handful of trades.
Why Position Sizing Matters More Than Stock Picking
Even a strategy with a high win rate can fail if position sizes are inconsistent or too large. A single oversized trade during a losing streak can erase weeks or months of gains. Using a position size calculator keeps every trade’s risk consistent, so your account grows in a controlled, predictable way.
How to Use This Position Size Calculator
- Enter your total trading capital
- Choose your risk per trade — 0.5%, 1%, 2%, 3%, or a custom percentage
- Enter your entry price and stop-loss
- Get your exact share quantity and capital required
How Much Should You Risk Per Trade?
Most professional traders risk 0.5%–2% of their total capital per trade. Risking more increases the chance of large drawdowns during a losing streak, while risking too little can make position sizes too small to be meaningful. This calculator lets you test different risk percentages instantly to find what suits your trading style.
Frequently Asked Questions
How much should I risk per trade?
Most professional traders risk 0.5%–2% of their total capital per trade. Risking more increases the chance of large drawdowns during a losing streak.
Does this work for F&O positions?
This tool is built for cash equity position sizing. For F&O, you’ll also need to account for margin/leverage separately using our Margin Calculator.
What happens if the calculated capital exceeds my total capital?
The calculator will warn you if the required capital exceeds your available capital, so you can adjust your stop-loss or risk percentage accordingly.
Should position size change for every trade?
Yes — position size depends on your stop-loss distance for that specific setup, so it will naturally vary from trade to trade even if your risk percentage stays constant.
A Note on Using This Responsibly
Proper position sizing is one of the risk management principles emphasised by SEBI’s Investor Education initiatives for retail traders. If you’re trading Futures or Options rather than cash equity, remember to also check your margin requirement using our Margin Calculator, since leverage changes how much capital you actually need to deploy.