Currency Option Pricing Calculator
Price currency options using the Garman-Kohlhagen model with volatility inputs
About this calculator
The Currency Option Pricing Calculator uses the Garman-Kohlhagen model to accurately price currency options by incorporating exchange rate volatility, interest rates, and other key variables. This specialized Black-Scholes adaptation is essential for forex traders, financial institutions, and risk managers who need to value currency derivatives and manage foreign exchange exposure. The calculator provides theoretical fair value pricing for both call and put options on currency pairs, helping users make informed trading and hedging decisions in volatile forex markets.
How to use
Enter the current exchange rate, strike price, time to expiration, domestic and foreign interest rates, and currency volatility. Select whether you're pricing a call or put option. The calculator will instantly compute the theoretical option price using the Garman-Kohlhagen formula, providing you with the fair value for your currency option.
Frequently asked questions
What is the Garman-Kohlhagen model?
It's a modified Black-Scholes model specifically designed for pricing currency options, accounting for both domestic and foreign interest rates in the valuation process.
How do I determine currency volatility input?
Use historical exchange rate data to calculate implied volatility, or reference market-quoted volatility from currency option trading platforms and financial data providers.
Why are two interest rates needed?
Currency options require both domestic and foreign risk-free rates because you're dealing with two currencies, each with different interest rate environments.