Position Size Calculator (Risk Management)
Protect trading capital with institutional risk-management discipline. This calculator computes your optimal position size based on a fixed risk percentage and your predefined stop-loss order, ensuring no single trade jeopardizes your portfolio.
Total current cash equity in your trading account
Percentage of account equity you are willing to lose on this trade
Planned execution or limit order entry price
Exit price where your trade thesis is invalidated
Maximum shares to buy without exceeding risk parameters
How to Use This Calculator
- Enter your total trading account equity balance.
- Select your risk tolerance percentage per trade (professional traders typically risk 1% to 2%).
- Input your planned entry price and technical stop-loss level.
- Execute only the resulting share quantity to adhere strictly to your risk budget.
Formula & Calculation Methodology
Fixed fractional position sizing determines share quantity by dividing tolerable dollar risk by per-share distance to the stop-loss order.
Worked Example
$25,000 account risking 1.5% with entry at $45 and stop-loss at $42
Frequently Asked Questions
Why should I use a fixed risk percentage instead of a fixed share count?↓
A fixed risk percentage ensures each trade incurs an equal monetary impact regardless of the asset’s share price or volatility. Volatile stocks automatically receive smaller position sizes, smoothing portfolio equity swings.
What is the recommended risk percentage per trade?↓
The widely accepted industry standard among professional prop traders and fund managers is between 1% and 2% of total account equity per position.
What happens if the position value exceeds my available account equity?↓
If the calculated position value exceeds your cash balance, either reduce your risk percentage, widen your stop-loss distance, utilize approved margin leverage, or seek assets with closer technical invalidation points.
Does this calculator factor in slippage and gap risk?↓
The calculation assumes your stop-loss executes exactly at your stated price. In overnight trading or market panics, price gaps can cause fills below your stop level.
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Source Citation & Disclaimer
Informational tool only; not licensed tax, legal, or financial advice.