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Calculate optimal position size based on risk.
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Position Size Calculator works out how many units to trade so that hitting your stop-loss costs only a fixed, pre-decided amount, from your account size, risk percentage, entry, and stop. It's the backbone of disciplined risk management.
The formula divides the money you're willing to risk (account × risk %) by the per-unit risk (entry-to-stop distance), giving a size that caps your loss at exactly your intended amount. That translation of a stop in price terms into a concrete position size is what most traders skip, and what most account blow-ups come from.
Why it matters more than analysis: proper sizing ensures no single trade can do serious damage, keeping you solvent long enough for your edge to play out. The widely-recommended principle is to risk a small, consistent slice, often 1–2%, per trade, because oversizing accelerates drawdowns and ends accounts.
Sizing controls losses, not wins: it makes losing streaks survivable rather than fatal, but it doesn't create profit. It's an analysis aid, not trading advice, and runs entirely in your browser. Pair it with the Risk-Reward and Lot Size calculators for complete trade planning.
| Price | Free, no signup, no paywall, no watermark |
|---|---|
| Works on | Any modern browser: desktop, tablet, and mobile |
| Processing | In your browser, files never leave your device |
| Account required | None |
| Category | Business Tools |
Enter your account size and the % you're willing to risk per trade
Enter your entry price and stop-loss
The tool calculates the position size that keeps your risk at the set amount
Use it to size every trade consistently
Calculates the position size that risks only a set amount per trade
From account size, risk percentage, entry, and stop-loss
Core risk-management tool for traders
Instant results as you type
Runs in your browser, your trade details stay on your device
Free, with no signup and no limit on calculations
Sizing a trade so a stop-loss risks a fixed % of your account
Enforcing consistent risk across trades
Avoiding oversized positions that risk too much
Planning entries with disciplined risk control
Risk a small, consistent % per trade (commonly 1–2%), oversizing is what blows up accounts
Size every trade so the stop-loss equals your fixed risk amount, regardless of the asset
Sizing controls losses, not wins, it keeps losing streaks survivable
Common questions about this tool, its workflow, and what to expect before you use it.
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Calculate optimal position size based on risk.
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