Implied Volatility Calculator
Calculate implied volatility (IV) from an option's market price using Black–Scholes. Enter stock price, strike, rate, time to expiration, and option price to solve for IV.
Per share, not per contract.
Annual rate as a percent (e.g., 5).
Optional — dividend yield as a percent (e.g., 2).
Enter underlying price, strike, option market price, risk-free rate, and time to expiration, then click Calculate IV to solve for implied volatility.
Related Tools
Black-Scholes Calculator
Calculate theoretical option prices
Options Probability Calculator
Estimate probability of profit at expiration
Expected Move Calculator
Calculate expected price range from IV
Want the full context? See the full trade planning workflow →
Implied Volatility Formula
Solve for σ such that:
Black–Scholes Price(σ) = Market Price
d1 = [ln(S/K) + (r - q + 0.5σ²)T] / (σ√T)
d2 = d1 - σ√T
Call = Se^(-qT)N(d1) - Ke^(-rT)N(d2)
Put = Ke^(-rT)N(-d2) - Se^(-qT)N(-d1)