Stock Options Calculator

About

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*