If you trade options, have you ever noticed your broker’s IV looks wrong on a Friday? For example, just now, when I looked at the number in the Robinhood App, I knew something was definitely wrong. As it turned out, many Apps use calendar days, ignoring the fact that markets are closed on weekends, to calculate options. This "Time Inflation" creates a massive error in your Greeks. The numbers are still wrong on other days, just not as obvious.
To trade like a professional, you must calculate based on Actual Trading Minutes remaining. Use the precision tool below to find the true market value or the actual implied volatility of your position.
Option Analyzer (Call/Put)
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| Stock Price ($) | |
| Strike Price ($) | |
| Dividend ($) | |
| Interest Rate (%) | |
| Trading Time Remaining | |
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| Option Price ($) | |
Greeks Demystified
The Greeks reveal the hidden DNA of your trade. If you are a seller, you are the landlord. Time is your friend. Theta is the daily rent you collect—and as expiration nears, that rent flows into your pocket at an accelerating pace. However, if you are a buyer, you are the tenant; every tick of the clock is a rent payment leaving your account.
- IV (Fear): High IV = Expensive Options. Low IV = Cheap Options.
- Delta: The sensitivity to the underlying stock price.
- Gamma: The acceleration of Delta. High Gamma means higher risk/reward.
- Theta: Time decay. Your daily profit (as a seller) or cost (as a buyer).
- Vega: Sensitivity to market volatility changes.
*Verify calculations before trading. Values include dividend adjustments based on annualized yield.