Trading Position Size Calculator

Most pros risk 0.5-2% per trade. Over 2% leads to rapid drawdowns — risking 5% and losing 10 in a row would cut the account by ~40%.

Size = (Balance x Risk%) / (Entry - Stop). With a $10k account risking 1% ($100) and $5 per-share risk, you would buy 20 shares ($100/$5).

Minimum 1:2 is recommended — target distance >= 2x stop distance. With 1:2 R:R you only need a 34% win rate to break even.

Yes, the Trading Position Size Calculator is 100% free with no registration, no hidden fees, and no usage limits. All processing happens locally in your browser, ensuring complete privacy.

Absolutely. The Trading Position Size Calculator processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the Trading Position Size Calculator is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the Trading Position Size Calculator in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

The Trading Position Size Calculator uses industry-standard formulas and algorithms to ensure accurate results. However, for critical financial or medical decisions, always consult a qualified professional.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The Trading Position Size Calculator works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

Because position size is driven by the distance between your entry and your stop, not by the share price. The formula is account balance times risk percent, divided by the risk per unit, where risk per unit is the gap between entry and stop. If your dollar risk is fixed at $100 and your stop sits $5 below entry, you can hold 20 shares; move the stop to just $2 below entry and the same $100 risk now buys 50 shares. The tighter stop does not make the trade safer overall, since a smaller move can hit it, but it does let you control more units while losing the same dollar amount if you are stopped out. Enter your entry and stop above to see exactly how the size changes as you adjust the distance.

For forex, sizing depends on three inputs: the dollar amount you are risking, the pip distance to your stop, and the pip value per standard lot. Divide your dollar risk by the per-lot value of your stop distance to get the number of lots. For example, risking $100 with a 20-pip stop and a $10 pip value per lot means each lot risks $200, so you would trade half a standard lot. The calculator handles this when you pick the Forex tab: it takes your pip value and leverage, then returns the result in standard lots along with the margin that position ties up. That keeps each trade the same fraction of your balance regardless of the pair. Switch to the Forex tab above, enter your pip value and stop, and read the lot size directly.

Fixed-dollar sizing risks the same cash amount on every trade, say $100, no matter how your account changes. Fixed-percentage sizing risks a constant share of your balance, such as 1%, so the dollar amount grows as you win and shrinks as you lose. The percentage method is what most professionals use because it compounds gains and automatically cuts risk during a drawdown, protecting the account when you are cold. Risking a flat dollar figure, by contrast, can quietly become a huge percentage of a shrinking balance. This calculator uses the percentage approach: enter your balance and risk percent and it converts that to a live dollar risk, then to units. Set your risk percent above and the tool recalculates the dollar figure every time your balance changes.

Leverage does not change how many units you should buy to control risk, but it changes how much cash is locked up to hold them. Your position size still comes from your dollar risk and stop distance; leverage only reduces the margin required, which is the notional value divided by the leverage. A $10,000 notional position at 10x leverage ties up $1,000 in margin instead of the full amount, freeing capital but magnifying liquidation risk if price moves against you. Higher leverage means a smaller adverse move can wipe out your margin, which is why the tool warns when leverage passes 100x. For crypto and futures the calculator shows both the position size and the margin so you can see the real capital commitment. Enter your leverage above to watch the required margin update instantly.

It infers direction automatically from the relationship between your entry and stop-loss prices. If your entry sits above your stop, the trade is treated as long: you profit when price rises and the stop below protects the downside. If your entry sits below the stop, it is read as short, so you gain when price falls and the stop above caps the loss. This means you never pick a direction manually; you just enter the two prices and the tool figures out the rest, then sizes the position from the absolute distance between them. If you add a take-profit price, it also computes the risk-to-reward ratio in the correct direction. Type your entry and stop above, and the calculator labels the trade and sizes it for you.