Position size calculator
Set how much you are willing to lose on the trade and where your stop is. Get the number of contracts, lots or shares that keeps a stop-out within that amount. Free, no sign-up, and nothing leaves your browser.
- Risk you set
- $500.00
- Risk per contract
- $200.00
- Risk at this size
- $400.00
How it works
Position size is risk divided by risk per unit. On ES, one point is worth $50, so a 4-point stop risks $200 per contract. With $500 of risk you can trade 2 contracts ($400 at risk), never 3.
The calculator always rounds down. Rounding up is how a planned 1% loss becomes 1.5%. If even one contract is too much, it points you to the micro contract, which is a tenth of the size.
Questions
How much should I risk per trade?
Many traders keep it to a small, fixed share of the account, often around 0.5% to 2%. On a prop account, it is common to size from the daily loss limit or the room left above the trailing drawdown instead. This calculator does the maths; the choice is yours.
Why is the result a whole number of contracts?
Futures trade in whole contracts, so the size is rounded down to stay within your risk. For forex the lots are rounded down to 0.01.
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Risk/reward calculator
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Prop firm cost calculator
What you have spent on evaluations, resets and fees against what you have been paid out: are you up or down?
Consistency rule calculator
Whether your best day is too big a share of your profit for your prop firm's consistency rule.
Size it right. Then see if you stuck to it.
Afterfill journals every trade from your fills and a few seconds of your voice, so you can see whether you followed the plan.