## Implied Volatility Calculator

**Option Price**
- The current price of the option.
**Spot Price**
- The current price of the underlying.
**Strike Price**
- The price at which the option can be exercised.
**Interest Rate**
- The current risk free interest rate with the same term as the
option's remaining time to expiration. It should be expressed as a
continuous per anum rate.
**Dividend Yield**
- The current dividend yield of the underlying. It may be
zero. Should be expressed in same terms as the interest rate.
**Expiration Date**
- The date the option expires