Free Options Trading Calculators
These five free calculators answer the questions beginners ask most: how much can I make or lose, what are the odds, how many contracts should I trade, what does a covered call return, and will I get assigned. They run in your browser with no sign-up.
Options Profit Calculator
This calculator shows the profit or loss of an options position at expiration for any stock price. Add up to four legs to see max profit, max loss, breakeven and the payoff diagram.
Probability of Profit Calculator
This calculator estimates the chance the stock finishes above or below a target price at expiration, using implied volatility. It also shows the one-standard-deviation expected move.
Position Size Calculator
This calculator tells you how many contracts you can trade without risking more than a chosen percentage of your account. It's the simplest guard against oversized positions.
Covered Call Calculator
This calculator shows what a covered call earns if the stock stays flat (static return) and if it's called away (if-called return), plus annualised figures.
Assignment Risk Checker
This rule-based checker explains how likely early assignment is on a short option. It's an explainer, not a prediction: assignment can happen any time on American-style options.
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