Position Size Calculator
The 1% rule made automatic. Plug in your account size, the percentage you're willing to risk per trade, your entry, and your stop. Returns the exact share count, dollar risk, and total exposure. The single most-bookmarked calculator in retail trading - because every disciplined trade starts with this number.
Read the lesson: Position Sizing Deep DivePosition Size Calculator
The 1% rule, made automatic. Tells you exactly how many shares to buy given your account, your per-trade risk, and where your stop sits.
Other calculators
- R-Multiple Calculator
Convert any trade outcome into R units. Lets you compare wins and losses across different position sizes on equal footing.
- Expectancy Calculator
What one trade is worth on average given your win rate, average winner, and average loser - and what 100 of them compound to.
- Kelly Criterion Calculator
The mathematically optimal fraction to risk per trade - and why the answer is always 'less than full Kelly'.
- Drawdown Recovery Calculator
The asymmetry that ends careers: a 50% loss takes a 100% gain to recover. Visualised at any drawdown level.