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Position Size Calculator — Trade Sizing by Risk %

Calculate the exact number of shares, units or lots to buy based on your account size, risk per trade and stop-loss distance.

Pros risk 0.5–2% per trade. Above 5% is gambling.

Position size
50.00 shares / units
Risk amount
$100.00
Risk / share
$2.00
Position value
$5,000.00
Capital used
50.00%
✨ AI Explainer

Your position size, decoded

Personalised to your numbers. Free 5/day · 25/day signed-in.

About this tool

Why position sizing is the #1 skill

The biggest gap between profitable traders and amateurs is not which charts they read — it's how much they risk per trade. Pros risk 0.5–2% of their account on any single position. Amateurs risk 20–50% and wonder why they blow up.

How this calculator works

You give it: your total account size, the percentage you're willing to lose on this trade, your entry price, and your stop-loss price. It tells you exactly how many shares to buy so that hitting your stop loses precisely that percentage — no more.

The math

Position size = (account × risk %) ÷ (entry − stop). If your $10,000 account risks 1% on a trade with $2 of risk per share, you buy 50 shares. Stop hits → you lose $100 (1%). Target hits → you keep the rest of the move.

How to use the Position Size Calculator

Takes about a minute. No signup, no download, your data stays in your browser.

  1. 1
    Open the tool. Scroll up to the Position Size Calculator above — it loads instantly in your browser, no install needed.
  2. 2
    Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
  3. 3
    Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.

Frequently asked questions

Common questions about the Position Size Calculator.

Is the Position Size Calculator free to use?

Yes. The Position Size Calculatoron 7BusyBoss is completely free — no signup, no paywall, no usage cap.

Do I need to sign up to use the Position Size Calculator?

No. The Position Size Calculatorworks instantly in your browser — no account needed. Signing in with Google is optional and only unlocks features like saving favorites and higher AI build limits.

Does the Position Size Calculator work on mobile?

Yes. Every tool on 7BusyBoss is mobile-responsive and works in any modern browser — Chrome, Safari, Firefox, Edge — on phones, tablets and desktops.

Is my data safe when I use the Position Size Calculator?

Yes. The Position Size Calculatorruns entirely in your browser — your inputs never leave your device unless the tool explicitly fetches public data (e.g. currency rates). We don't store the values you type.

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