Options Vega Calculator
Estimate the vega of European options: the price change per 1-percentage-point rise in implied volatility.
Results
Fill in the inputs and click Calculate.
- Vega (per +1% vol)
- –
Risk disclaimer
This calculator provides theoretical references, not investment advice. Real markets include supply/demand, vol surfaces and liquidity; Greeks change in real time.
What does it measure?
Higher vega means more sensitivity to volatility expectations. Rising IV lifts both calls and puts.
How to use
- Choose call or put.
- Enter spot, strike, time to expiry in years and annual volatility %.
- Risk-free rate defaults to 0; fill it in if needed.
- Click Calculate to see this Greek.
Formula (Black-Scholes)
- Vega (per 1%) = S·φ(d1)·√T ÷ 100
Example
Spot 100, strike 100, 1 year, vol 20%, rate 0%: vega ≈ 0.3970 per 1% vol move.
FAQ
How should I read these values?
Each is a model-based partial derivative of option price: Delta w.r.t. spot, Gamma w.r.t. delta, Vega w.r.t. volatility, Theta w.r.t. time.
Why is the risk-free rate 0 by default?
Crypto options are often priced with a near-zero risk-free rate; change it for classic-market comparisons.