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Trade Risk Calculator

Find the exact position size for any trade. Enter your account, the risk you're willing to take, and your stop-loss — protect your capital on every position.

Position size — Fill in the fields to size your trade
—Risk amount
—Position value
—Reward : risk
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How the trade risk calculator works

Smart traders decide how much they're willing to lose before they enter a trade. This calculator takes that risk rule and turns it into an exact number of shares, units, or contracts to buy or sell. The math is simple:

Position size = (Account × Risk %) ÷ (Entry − Stop-loss)

First it finds your risk amount — the cash you'd lose if the stop is hit. Then it divides that by the per-unit risk, the distance between your entry and your stop. The result is the largest position you can take while keeping your loss capped at your chosen percentage. If you add a take-profit price, it also shows your reward-to-risk ratio.

Frequently asked questions

What is a trade risk calculator?

It works out how large a position you can take so that, if your stop-loss is hit, you only lose a fixed percentage of your account — turning your risk rules into an exact position size.

How much should I risk per trade?

Many traders risk 1–2% of their account on a single trade. Risking less protects your capital during losing streaks. This tool defaults to 1% but you can set any value.

How is position size calculated?

Position size equals your risk amount (account × risk %) divided by the distance between your entry and stop-loss prices.

Want the full breakdown with examples? Read: How to Calculate Position Size and Risk Per Trade →

This calculator is an educational tool for risk management and is not financial advice. Trading involves substantial risk of loss. Always do your own research and consider consulting a licensed financial professional.