The main categories of the national economy, including the world's is money. Money serves as the primary mean for the exchange of goods and services, thereby serving as a realistic indication of the importance and dynamism of some markets. The exchange rate is the price of one unit of foreign currency expressed in number of units of local currency. It shows how many units of local currency are needed to pay for one unit of foreign currency. Changes in foreign exchange rates affect the prices of imports, the viability of imports, the profitability of the production of import substitutes, or to domestic prices of exported goods. The course is therefore very important variable of economic policy because it affects all macroeconomic issues. This paper will show the past and the possibility of future relations between the kuna (HRK) and the euro (EUR). The growth of euro against the Croatian kuna, reached its maximum these months according to the exchange rate list of the Croatian National Bank. On the international currency markets, the euro has strengthened, although the European Central Bank (ECB) has further loosen monetary policy and more aggressively than expected. All EU member states are obliged to adopt the euro and join the euro area including Croatia.