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Option Price Calculator
Calculate option prices using Black-Scholes or Binomial Tree models.
Calculate Greeks - Gamma, Rho etc.
Calculate probability of closing in-the-money (ITM)
Calculate a multi-dimensional analysis
The below calculator will calculate the fair market price, the Greeks, and the probability of closing in-the-money (ITM) for an option contract using your choice of either the Black-Scholes or Binomial Tree pricing model.
The binomial model is most appropriate to use if the buyer can exercise the option contract before expiration, i.e., American style options. In contrast, traders should use the Black-Scholes model for contracts that they can exercise only at option expiration, i.e., European style.
Delta measures the rate of change of the theoretical option value to changes in the underlying asset's price. Delta is on a scale from 1.00 to -1.00. Deep-in-the-money options eventually move dollar for dollar with the underlying stock. Note, calls, and puts have opposite delta signs.
Gamma is the measurement of the rate of change of the Delta.
Theta measures the rate of decline in the price of an option due to time passing. Theta is also known as "time decay."
Vega measures an option's sensitivity when there are changes in the volatility of the underlying asset. In finance, we express Vega as the amount of money per underlying share that the option's value will gain or lose as volatility rises or falls by one percentage point. All options (both calls and puts) will gain value with increasing volatility.
Rho measures the sensitivity of a stock option price to a change in interest rates.
Omega (Elasticity) is the percentage change in option value per percentage change in the underlying price. Omega is a measure of leverage. The higher the Omega, the greater the leverage (or the greater the risk).
Probability, while not a Greek, probability measures how likely an option contract will close ITM (in-the-money). You should note that just because a contract is ITM does not mean the option trade will be profitable. Profitability depends on the premium paid.
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Currency and Date Conventions
All calculators will remember your choice. You may also change it at any time.
Clicking "Save changes" will cause the calculator to reload. Your edits will be lost.
7 Comments on “Option Price Calculator | American Or European Options”
Questions? Ask them here. We're happy to help.
Jim Nance says:
Hi Karl, I’m looking to automate, as fully as possible, the pricing & manipulation of american stock options such as Google, Apple, IBM, etc. (I don’t trade indexes, futures, european, etc.) I’m having the devil of a time getting a risk-free interest rate I feel confident to use – from every source I’ve read nobody can agree between using the S&P, or T-Bill rates, or LIBOR swap curve. Do you have a binomial option pricing calculator that will calculate the historical volatility & implied volatility, populate the risk free interest rate, chart multiple legs & show the affects of time erosion for strategy analysis and forecast price probability?
Please say you do…….thanks for your time, Jim
Karl says:
Hi Jim, I don’t have anything that populates the risk-free rate of return. You’ll have to type it in yourself. Nor do I have anything that calculates the implied volatility, but this calculator should make the other calculations that you asked about. Make sure you have the "Pricing Model" on the Calculator tab set to "Binomial Tree".
jim nance says:
Thank-you for the prompt response. Jim
Andre D Wright says:
Is it possible to write 20 year call options against stock?
Karl says:
I can’t say. Sorry. But my guess is, sure, it can be done, but how do you find a buyer? You would also need someone to prepare the contract, I imagine.
Mark Burch says:
I am trying to get the chart for a mortgage of $105,000. repayment over 20 years, which we are already at the end of period and be able to print the chart as well.
Karl says:
This amortization schedule calculator will allow you to print a payment schedule. I think that’s what you are looking for. Let me know if you had anything else in mind. I’m not sure because you are on the Options calculator page.
Jim Nance says:
Hi Karl,
I’m looking to automate, as fully as possible, the pricing & manipulation of american stock options such as Google, Apple, IBM, etc. (I don’t trade indexes, futures, european, etc.)
I’m having the devil of a time getting a risk-free interest rate I feel confident to use – from every source I’ve read nobody can agree between using the S&P, or T-Bill rates, or LIBOR swap curve.
Do you have a binomial option pricing calculator that will calculate the historical volatility & implied volatility, populate the risk free interest rate, chart multiple legs & show the affects of time erosion for strategy analysis and forecast price probability?
Please say you do…….thanks for your time,
Jim
Karl says:
Hi Jim, I don’t have anything that populates the risk-free rate of return. You’ll have to type it in yourself. Nor do I have anything that calculates the implied volatility, but this calculator should make the other calculations that you asked about. Make sure you have the "Pricing Model" on the Calculator tab set to "Binomial Tree".
jim nance says:
Thank-you for the prompt response.
Jim
Andre D Wright says:
Is it possible to write 20 year call options against stock?
Karl says:
I can’t say. Sorry. But my guess is, sure, it can be done, but how do you find a buyer? You would also need someone to prepare the contract, I imagine.
Mark Burch says:
I am trying to get the chart for a mortgage of $105,000. repayment over 20 years, which we are already at the end of period and be able to print the chart as well.
Karl says:
This amortization schedule calculator will allow you to print a payment schedule. I think that’s what you are looking for. Let me know if you had anything else in mind. I’m not sure because you are on the Options calculator page.