Position Sizing

Calculate quantity from risk per trade
This free online position sizing runs in your browser and is part of our Trading & F&O collection.

Position Sizing Calculator

Calculate quantity based on risk per trade

Notes

  • Quantity is rounded to whole lots based on lot size.
  • Risk per trade = quantity × |entry − stop|.
  • R multiple = reward ÷ risk when target is provided.
  • Educational use only. Not financial advice.
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Instant In-Browser Execution Runs locally in JavaScript without wait times or server delays.
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100% Privacy & Security Your inputs and files are never stored or logged on remote servers.
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Cross-Device Responsive Fully optimized for mobile smartphones, tablets, and desktop displays.
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100% Free Forever No subscription fees, no signups, and no software installations.

How to Use the Online Position Sizing

1 Set Account Balance & Risk %

Enter your total account capital and the maximum percentage you are willing to risk on this trade (typically 1% to 2%).

2 Enter Trade Prices & Lot Size

Provide your intended entry price and mandatory stop-loss price. Optionally specify a target price, contract lot size, and minimum lots.

3 Select an Index Preset

Click quick presets like NIFTY 50, SPY, Dow Jones, S&P 500, or NASDAQ to automatically load relevant lot sizes and standard contract specs.

4 Review Calculated Position & R:R

Click Calculate to inspect the exact number of lots, total units, absolute risk amount, and risk-to-reward (R-multiple) on the interactive P&L chart.

Frequently Asked Questions

Common questions about using this free online position sizing.

Why does the calculator round down position sizes? ▾
In exchange-traded futures and options, contracts must be transacted in whole lots. The calculator rounds down fractional lots to strictly guarantee that your maximum dollar risk remains below your defined risk limit.
How is the risk-to-reward (R-multiple) calculated? ▾
When an optional target price is entered, the R-multiple equals the potential profit (target price minus entry price) divided by the potential loss (entry price minus stop-loss price). A value of 2.0 or higher indicates a favorable 2:1 reward-to-risk ratio.
Does this calculator account for slippage and broker commissions? ▾
The calculator focuses on structural mathematical risk based on price distance. Traders should leave an additional small buffer for market execution slippage and exchange turnover charges.
Can I use this for stocks and cryptocurrency without lots? ▾
Yes. Simply leave the Lot Size set to 1. The calculator will then display the exact number of shares or coin units to buy or short.

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