# Theoretical option price calculation. Options calculator

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Option pricing theory uses variables stock price, exercise price, volatility, interest rate, time to expiration to theoretically value an option. Essentially, it provides an estimation of an option's fair value which traders incorporate into their strategies to maximize profits.

### Using Theoretical Price Calculator on ThinkOrSwim(TOS)

Some commonly used models to value options are Black-Scholesbinomial option pricingand Monte-Carlo simulation. Understanding Option Pricing Theory The primary goal of option pricing theory is to calculate the probability that an option will be exercised, or be in-the-money ITMat expiration.

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Underlying asset price stock priceexercise pricevolatilityinterest rateand time to expiration, which is the number of days between the calculation date and the option's exercise date, are commonly used variables that are input into mathematical models to derive an option's theoretical fair value.

Aside from a company's stock and strike prices, time, volatility, and interest rates are also quite integral in accurately pricing an option.

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The longer that an investor has to exercise the option, the greater the likelihood that it will be ITM at expiration. Similarly, the more volatile the underlying asset, the greater the odds that it will expire ITM. Higher interest rates should translate into higher option prices.

Introduction to Options Theoretical Pricing Option pricing is based on the unknown future outcome for the underlying asset. If we knew where the market would be at expiration, we could perfectly price every option today.

Real traded options prices are determined in the open market and, as with all assets, the value can differ from a theoretical value. However, having the theoretical value allows traders to assess the likelihood of profiting from trading those options. The evolution of the modern-day options market is attributed to the pricing model published by Fischer Black and Myron Scholes.

The Black-Scholes formula is used to derive a theoretical price for financial instruments with a known expiration date. However, this is not the only model.

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The Cox, Ross, and Rubinstein binomial options pricing model and Monte-Carlo simulation are also widely used. Key Takeaways Option pricing theory uses variables stock price, exercise price, volatility, interest rate, time to expiration to theoretically value an option.

### Option Pricing Theory

The theoretical option price calculation goal of option pricing theory is to calculate the probability that an option will be exercised, or be in-the-money ITMat expiration. Some commonly used models to value options are Black-Scholes, binomial option pricing, and Monte-Carlo simulation.

Also, implied volatility is not the same as theoretical option price calculation or realized volatility. Currently, dividends are often used as a sixth input.

Additionally, the Black-Scholes model assumes stock prices follow a log-normal distribution because asset prices cannot be negative. Other assumptions made by the model are that there are no transaction costs or taxes, that the risk-free interest rate is constant for all maturitiesthat short selling of securities with use of proceeds is permitted, and that there are no arbitrage opportunities without risk.

Everything else can be subsumed under these 2 variables. If a given variable increases the option premium, it is because it increases 1 or both factors. Thus, a longer theoretical option price calculation until expiration or a greater volatility increases premiums because of the greater chance the option will be in the money by expiration, and by a larger amount; likewise, premiums are low for an option way out of the money, because there is little chance the underlying asset will reach the strike price by expiration. While prices and time intervals are easy enough to measure, what cannot be known with certainty is the volatility of the underlying asset, and therefore, the probability that an option will be in the money or by how much, before expiration. Historical volatility is not necessarily a good indicator of future volatility, although it does provide some measure of volatility.

Clearly, some of these assumptions do not hold true all of the time. For example, the model also assumes volatility remains constant over the option's lifespan. This is unrealistic, and normally not the case, theoretical option price calculation volatility fluctuates with the level of supply and demand.

However, for practical purposes, this is one of the most highly regarded pricing models. Compare Accounts.