One Jamaican dollar is equivalent to 0.00869943 USD as of January 25, 2015. One United States dollar, then, is equal to 114.95 Jamaican dollars. Since exchange rates change often, they should be checked frequently.
There are six factors that contribute to the reason for constantly changing exchange rates. These factors are inflation rates, interest rates, the current account deficits of a county (amount spent on foreign trade versus the amount that a country is earning), the level of public debt of the country in question, terms of trade between two countries and the stability and economic growth of a country.