Serious finance math, run privately in your browser
These are the calculators traders and investors actually reach for: a Black-Scholes option pricer with full Greeks, position sizing that respects your risk-per-trade, the Kelly Criterion for bet sizing, Sharpe and Sortino ratios for risk-adjusted return, CAGR, bond yield to maturity, and long-horizon tools like SIP and FIRE projections.
Every calculation happens locally in your browser. Your account size, position details, and return history are never sent to a server — useful when you would rather not paste your portfolio into an anonymous web form.
From a single trade to a whole portfolio
Use Position Size and Risk/Reward before entering a trade, price an option and its sensitivities with Black-Scholes, then judge a strategy over time with Sharpe/Sortino and CAGR. For longer horizons, project contributions with the SIP calculator or work out your independence number with FIRE.
- Before a trade: size the position to a fixed risk %, then check risk/reward
- Options: price calls/puts and read delta, gamma, theta, vega, rho
- Reviewing results: annualised Sharpe and Sortino from your return series
- Long term: SIP contributions, dividend DRIP growth, and FIRE targets
Estimates, not financial advice
These tools use standard textbook formulas (Black-Scholes, annuity future value, YTM by numerical solving) and are excellent for learning, planning, and comparing scenarios. They are not investment advice, do not account for taxes, slippage, or fees unless a field asks for them, and market outcomes are never guaranteed. Always confirm important figures against your broker and a professional where it matters.
Browse related how-tos in our Guides, or read more about why Whiztools keeps processing on-device in About.