Trading Calculators
Free, no-signup interactive calculators for the math every working trader uses - position sizing, R-multiple, expectancy, Kelly, drawdown recovery. Plug your own numbers in, see the answer. Bookmark the ones you reach for daily.
Position Size Calculator
How many shares or contracts to buy given your account size, per-trade risk, and stop distance.
Open calculatorR-Multiple Calculator
Convert any trade outcome into R units. Lets you compare wins and losses across different position sizes on equal footing.
Open calculatorExpectancy Calculator
What one trade is worth on average given your win rate, average winner, and average loser - and what 100 of them compound to.
Open calculatorKelly Criterion Calculator
The mathematically optimal fraction to risk per trade - and why the answer is always 'less than full Kelly'.
Open calculatorDrawdown Recovery Calculator
The asymmetry that ends careers: a 50% loss takes a 100% gain to recover. Visualised at any drawdown level.
Open calculator