Option Greeks
Vega Calculator
Estimate how much an option's price may change when implied volatility changes.
Vega is one of the option Greeks. It measures an option's sensitivity to changes in implied volatility. This calculator provides a simple educational estimate using the Black‑Scholes model.
What is vega?
- Vega is an option Greek.
- It estimates an option's sensitivity to implied volatility.
- Higher vega means the option is more affected by volatility changes.
- Vega is usually larger for options with more time to expiration.
- Vega is often highest near the money.
How to use this vega calculator
- Enter the current stock price.
- Enter the strike price.
- Enter days to expiration.
- Enter implied volatility.
- Adjust the risk-free rate or dividend yield if needed.
- Click Calculate.
Why vega matters
- Options can gain or lose value when implied volatility changes.
- Traders use vega to understand volatility exposure.
- Vega does not predict direction.
- Vega is only one part of option pricing.
Related tool
Once you know an option's vega, you can scale it across contracts and a portfolio to see total volatility exposure. VegaMetric.com is a companion educational tool that takes vega per contract and estimates the dollar impact of an implied volatility move at the position and portfolio level.
Educational disclaimer. This calculator is for educational and informational purposes only. It is not investment advice, trading advice, or a recommendation to buy or sell any security or option. Calculations are estimates and may differ from real market prices.