Calculators

Every calculator validates input, shows results instantly, and gives you a shareable link — just bookmark or copy the URL after calculating.

Black-Scholes Calculator

Theoretical option price and full Greeks using the Black-Scholes model.

Estimate a fair option premium from spot, strike, volatility, and time to expiry.

Delta, Gamma, Theta, Vega, and Rho for any option.

See how an option's time value erodes as expiry approaches.

Back out the market's implied volatility from an option's traded price.

The one-standard-deviation price range implied by volatility.

Risk-neutral probability an option expires in-the-money.

The underlying price at which a single option position breaks even at expiry.

Payoff-at-expiry for a single option leg (see the Strategy Library for multi-leg payoffs).

The risk-to-reward ratio for a planned trade.

How many units to trade while risking a fixed percentage of your capital.

Convert between quantity and lots for a given contract lot size.

Illustrative margin estimate for a short option position (not a live exchange SPAN figure).

Return on investment between two portfolio values.

Compound growth of a lump sum over time.

Future value of a monthly systematic investment.

Illustrative tax on trading gains at a rate you specify. Not tax advice — consult a professional for your actual liability.