Stock Options Calculator

A Black-Scholes options calculator with Greeks

Stock Options Calculator is a fast, privacy-first tool for options traders and students. Calculate payoff diagrams, break-even points, maximum profit / loss and full option Greeks (Δ Γ Θ V ρ) for 12+ strategies in one click—right inside your browser. Key features • Black-Scholes pricing for calls & puts with custom σ, r and dividend yield • Instant payoff graph for Long/Short Call, Put, Straddle, Strangle, Vertical Spreads, Iron Condor, Butterfly, Calendar and more • Combined Greeks for multi-leg positions (Delta-neutral checks, risk by leg) • Auto-detects days-to-expiry and warns about invalid dates or empty inputs • 100 % offline—no data leaves your computer; no tracking, no analytics • Clean dark-mode-ready UI; keyboard-friendly; zero ads Who is it for? • Retail traders who want a quick sanity check before placing an order • Students learning derivatives and Black-Scholes maths • Instructors who need a live demo during lectures Usage Click the extension icon. Choose a strategy (e.g. Bull Call Spread). Enter stock price, strike(s), premium(s) and market parameters. Hit Calculate → see P/L chart, break-evens and Greeks. *This tool is purely for educational purposes, not meant to be financial advise*