Position Size Calculator
How many contracts can you trade without breaking your own risk rule? Enter your numbers and find out.
Maximum position
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- Risk budget
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- Risk per contract
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- Total risk at this size
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- Stop distance in price
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How the calculation works
- Risk budget = account size × risk %. Example: $10,000 × 1% = $100.
- Risk per contract = stop distance in ticks × tick value, plus round-turn costs. Example: 16 ticks × $1.25 (Micro E-mini S&P) = $20.
- Contracts = risk budget ÷ risk per contract, rounded down. Example: $100 ÷ $20 = 5.
Want the reasoning behind fixed-fractional sizing? Read our guide to position sizing.
Common questions
How much should I risk per trade?
There's no single right number. Many trading educators suggest risking a small fixed percentage of the account on each trade, often 1–2% or less, so a losing streak doesn't cripple the account.
Why does the calculator round down?
You can't trade a fraction of a contract, and rounding up would put more money at risk than your rule allows.
Does this include slippage?
No. It assumes your stop fills at the exact price. In fast or thin markets, fills can be worse, so actual losses can be larger.