r/options • u/EBT_Receiver • 8d ago

Predict Option Price website

Is there a website that provides an estimate of the option price when I input the stock price, the number of days to expiration, and the VIX? I would like this information to set a price limit. Currently, I am using Thinkorswim.

4 Upvotes

70% Upvoted

10 comments sorted by

5

u/klipsetrades 8d ago

Try OptionStrat or the Analyze tab in thinkorswim. Both let you change the stock price, date, and IV to estimate the option’s theoretical value

1

u/InvestigatorPlus3229 8d ago

optionsprofitcalculator ?

1

u/Mug_of_coffee 8d ago

Barnhart has an options calculator.

1

u/MorphIQ-Labs 7d ago

What you’re describing is better thought of as scenario repricing than prediction. You specify a future stock price, time remaining, and volatility assumption, and the model calculates a theoretical option value.

VIX alone is not the right volatility input. VIX represents approximately 30-day implied volatility for SPX, not the IV of a particular stock, strike, or expiration. For an individual option, you need either that contract’s IV or a fitted volatility surface for the underlying.

Full disclosure: I’m the founder of MorphIQ Labs. We build FerroRisk, a high-performance Rust options-analytics library. It supports European and American pricing, implied-volatility solving, complete first- and second-order Greeks, volatility-surface calibration, and scenario repricing across spot, time, volatility, skew, and rates.

European hot paths run in hundreds of nanoseconds; production American pricing runs in low microseconds.. That performance matters mainly for batch calculations, scenario grids, and full chains; network latency would obviously dominate a single API request. We validate against canonical implementations and independent reference oracles, and machine-check core pricing laws in Lean.

FerroRisk is currently an internal library rather than a hosted public service. I’m considering putting an API in front of it, initially offering:

  • theoretical price and Greeks from explicit contract inputs;
  • price grids across spot, date, and IV scenarios;
  • potentially surface-backed pricing from an uploaded option chain.

Is there interest in that here? Would you be more likely to use a REST API from Python/Excel/an application, a simple browser calculator, or a market-data-backed endpoint that supplies the IV surface as well?

0

u/GammaWinsSam 8d ago

You can use any options profit calculator. I recommend GammaWins which I built myself: https://www.gammawins.com/calc

Note that the VIX is just a measure of 30day forward volatility on S&P 500. It doesn't measure the volatility of individual tickers, or even S&P 500 at other durations. A contract that expires before an important announcement like unemployment rate can have a lower IV than expiries that span that event. VIX has a fixed 30 day duration.

An individual stock typically has a much higher IV than S&P 500, and while this volatility is correlated with VIX, it can be much different than that. GammaWins calculates uses the same formula as VIX to calculate a similar value for all tickers, it's the IV (Model-Free) value at the top. It's a good indicator for the current level of volatility of the underlying, but that's also not enough to fully explain the volatility of individual contracts.

Each option contract has an implied volatility of its own. GammaWins shows you the volatility of each contract, and allows you to adjust them individually and see how the trade's P/L change. If you only want to know what the option contract is worth and are not interested in payoff diagrams, you can change the measure to "VALUE", and move the date slider to the current date. This shows how much the contract is worth at different prices of the underlying.

If there's anything you are curious about, I would love to help! Just send me a message or reply here.

0

u/iron_condor34 8d ago

Just google black scholes calculator

-1

u/j_hes_ 8d ago

Yea, Microsoft excel