Financial Calculators

Use this implied volatility calculator to back out the volatility a market is pricing into a call option from its price, strike, spot, expiry and rate.

Calculate Delta, Gamma and Vega for a call option with this Black-Scholes option Greeks calculator, and see how price, time and volatility drive risk.

Use this Black-Scholes calculator to price European call and put options from spot, strike, time, rate and volatility, and see each option's fair value.

Use this put-call parity calculator to derive a European put price from the matching call, spot arbitrage, and check that option quotes are consistent.

This bond convexity calculator shows a bond's convexity, price and periods from coupon, yield and maturity, and how it refines rate risk beyond duration.

Use this MIRR calculator to find the modified internal rate of return on an investment, using a realistic reinvestment rate for the cash it returns.

Use this futures margin calculator to work out the initial margin required, the notional value your deposit controls, and the leverage of any futures position.

This covered call yield calculator finds the premium yield, annualized return and maximum profit of a covered call, so you can compare strikes and expiries.

This DCA vs lump sum calculator compares dollar-cost averaging with investing all at once, showing which ends ahead under rising or falling prices.

This dividend growth DRIP calculator models reinvested, rising dividends and shows how they compound your share count and portfolio value over time.

Use this dividend reinvestment calculator to see how much reinvesting dividends adds to an investment compared with price gains alone.

Use this Value at Risk calculator to estimate the loss your portfolio is unlikely to exceed at 90%, 95% or 99% confidence. It runs privately in your browser.

This covariance calculator turns a correlation coefficient and two standard deviations into covariance for portfolio variance and diversification analysis.

Use this correlation calculator to turn a covariance and two standard deviations into the correlation coefficient. See how strongly two assets move together.

This portfolio expected return calculator blends two assets by weight into one expected return, for stock-bond mixes, 60/40 portfolios and weighted averages.

This two-asset portfolio optimizer finds the minimum-variance blend of two investments from their volatility and correlation, with the ideal split.

This rebalancing bands calculator shows when a holding has drifted too far from target: set a tolerance band and get a rebalance signal.

This portfolio rebalancing calculator works out the exact buys and sells to return a stock and bond portfolio to your target allocation, in any currency.

This portfolio volatility calculator combines two assets' weights, volatility and correlation into one risk figure and shows the diversification benefit.

Use this information ratio calculator to see how much active return a portfolio earned for each unit of tracking error against its benchmark.

Use this Ulcer Index calculator to measure the depth and duration of an investment's drawdowns from a series of values and see its downside risk.

This drawdown recovery calculator shows the gain needed to recover from a portfolio drawdown and how many years it takes at your assumed return, in any market.

Use this maximum drawdown calculator to find the largest peak-to-trough decline in a series of portfolio values and measure downside risk.

This expected return calculator turns a series of annual returns into the arithmetic mean and the compounded geometric return, side by side.

This TWR vs MWR calculator compares time-weighted and money-weighted returns to show your behaviour gap: did the investment or your timing drive the result?

Use this money-weighted return calculator to find the annual return your money earned, accounting for the size and timing of every contribution.

This time-weighted return calculator chains period returns into one figure that ignores deposits and withdrawals, showing how your portfolio performed.

Use this risk of ruin calculator to see the chance a trading strategy wipes out your account. Enter your win rate and risk per trade to test survival odds.

Use this position size calculator to work out how many shares to buy based on your account size, risk per trade, entry price, and stop-loss.

Use this Kelly Criterion calculator to find the optimal fraction of capital to stake from your win probability and win/loss ratio. See full and half Kelly.