Options calculators

Twelve free calculators for people who sell options rather than buy them. Covered calls, cash-secured puts, the wheel, assignment odds, Black-Scholes and the Greeks, implied volatility, IV rank, position sizing and rolls. No sign-up, nothing stored, and the numbers run in your browser.

• Covered Call Calculatorstatic return, if-called return, break-even and downside cushion on any covered call.
• Cash-Secured Put Calculatorcapital tied up, break-even, return on secured cash and the real worst case.
• Options Payoff Diagram Builderbuild any combination of legs and draw the profit and loss curve at expiration.
• Wheel Strategy Calculatorfull-cycle return across the put, the assignment and the call.
• Assignment Probability Calculatorprobability of finishing in the money, probability of touch, and how far delta is off.
• Annualized Return Calculatorturn a premium and a holding period into a comparable yearly rate.
• Options Break-Even Calculatorbreak-even for calls, puts, long, short and covered positions.
• Black-Scholes Calculatortheoretical price plus delta, gamma, theta, vega and rho.
• Implied Volatility Calculatorsolve for IV from a market price, plus the implied daily and expiry move.
• IV Rank Calculatorwhere today's implied volatility sits in its own 52-week range.
• Options Position Size Calculatorhow many contracts your account and your risk limit actually allow.
• Options Roll Analyzeris rolling this position actually worth it, in credit per added day.

Why these and not a hundred others

Every one of these answers a question a premium seller asks before placing a trade, and most of them answer it in a way a table of numbers cannot. There is no options-profit-simulator here, no strategy screener, no backtester. Those are different products and mostly worse ones.

The math is the same code the OptionsKing engine runs, down to the Cephes normal-distribution port that every probability and Greek depends on. A calculator that disagreed with the app would be worse than no calculator at all.

What none of them do

They do not fetch quotes, they do not know what you own, and they do not store a single thing you type. You supply the numbers. That is deliberate: it keeps the pages fast, it keeps them working without an account, and it means nothing on them can be mistaken for a live recommendation.

The app is the other half. It pulls the chain, scores every strike, applies a fixed confidence bar before anything reaches you, and keeps a ledger of what your trades actually earned. How it works covers what that bar guarantees.