Trading & risk calculators
Interactive tools — each with its formula, worked examples, and FAQ. Arithmetic for learning and planning, never advice or signals.
Risk
Position Size Calculator
Size a position from account risk and stop distance.
Open toolRisk/Reward Ratio Calculator
Compare potential reward to risk and find the break-even win rate.
Open toolBrokerage / Cost Calculator
Estimate transaction costs and the move needed to break even.
Open toolMargin & Leverage Calculator
Required margin and effective leverage for a position.
Open toolOption Payoff Calculator
Visualize the expiration payoff of a single option leg.
Open toolKelly Criterion Calculator
The growth-optimal fraction from your win rate and payoff ratio.
Open toolAverage Cost Calculator
Blended cost basis across multiple fills, weighted by quantity.
Open toolPerformance
CAGR Calculator
Compound annual growth rate between two values over time.
Open toolMax Drawdown Calculator
Largest peak-to-trough decline of an equity curve.
Open toolExpectancy Calculator
Expected value per trade from win rate and average win/loss.
Open toolSharpe Ratio Calculator
Risk-adjusted return from mean, volatility, and risk-free rate.
Open tool