Options Theta Visualizer

See option premium decay over time
This free online options theta visualizer runs in your browser and is part of our Trading & F&O collection.

Options Theta Visualizer

See option premium decay over time (European)

Notes

  • European Blackโ€“Scholes pricing used; dividends ignored.
  • Theta varies over time; this shows premium vs. days.
  • Educational use only. Not financial advice.
โšก
Instant In-Browser Execution Runs locally in JavaScript without wait times or server delays.
๐Ÿ”’
100% Privacy & Security Your inputs and files are never stored or logged on remote servers.
๐Ÿ“ฑ
Cross-Device Responsive Fully optimized for mobile smartphones, tablets, and desktop displays.
๐ŸŽ‰
100% Free Forever No subscription fees, no signups, and no software installations.

How to Use the Online Options Theta Visualizer

1 Input Strike & Underlying Spot

Enter the current spot price, option strike price, and select whether you are analyzing a Call or Put contract.

2 Configure Volatility & Interest Rate

Provide implied volatility (IV %) and annual risk-free rate, or select a market preset such as NIFTY Weekly or SPY Monthly.

3 Set Days to Expiration

Choose your total time horizon in calendar days to model the decay path.

4 Visualize Time Decay Curve

Click Visualize to generate the day-by-day non-linear option premium erosion curve and average daily Theta decay estimate.

Frequently Asked Questions

Common questions about using this free online options theta visualizer.

Why does Theta decay accelerate as expiration approaches? โ–พ
For at-the-money (ATM) options, time value decays at a rate proportional to 1 / sqrt(time). As expiry nears (especially the final 30 to 14 days), the probability distribution narrows rapidly, causing Theta decay to steepen dramatically into a cliff.
Is Theta decay the same for Calls and Puts? โ–พ
Under Black-Scholes, Call and Put Theta are very close for ATM options, but differ slightly for ITM/OTM options due to the discounting effect of the risk-free interest rate on the strike price.
Does this visualizer assume constant volatility over time? โ–พ
Yes. The curve isolates pure time decay (Theta) under the assumption that implied volatility and spot price remain unchanged throughout the holding period.
Why is Theta usually expressed as a negative number for option buyers? โ–พ
Theta represents the rate of change of an option's price with the passage of one day. Because options are wasting assets, buyers lose value each day time passes, while option sellers benefit from this decay.

More Trading & F&O

Explore related tools in the same category to solve adjacent tasks faster.

Position SizingCalculate quantity from risk per tradeFutures Fair ValuePrice futures via cost of carryOption Strategy PayoffBuild multi-leg option strategies and payoff chartBlack-Scholes + GreeksEuropean option pricing and GreeksImplied Volatility SolverCompute IV from observed option price