Currency risk affects any business or investor with exposure to foreign-denominated cash flows — exporters receiving payments in foreign currency, importers paying overseas suppliers, multinational corporations consolidating foreign subsidiary earnings, and investors holding international assets. Exchange rate movements of 5-15% in a single year are common even among major currencies, and emerging market currencies can swing far more. A US company expecting to receive 1 million euros in six months faces a real risk that the euro could weaken by 5%, reducing the dollar value by $50,000 or more. Forward contracts, the most common hedging instrument, lock in a future exchange rate based on the interest rate differential between two currencies — this is the covered interest rate parity principle. The forward rate will be at a premium or discount to the spot rate depending on whether the foreign interest rate is lower or higher than the domestic rate. This currency hedging calculator helps you determine the correct hedge size, compute the forward rate from spot rates and interest rate differentials, estimate the annualized hedge cost, and compare your hedged return against an unhedged scenario.
How currency hedging works
Currency hedging uses financial instruments — most commonly forward contracts — to lock in an exchange rate today for a transaction that will happen in the future. By fixing the rate, you remove uncertainty about how much foreign currency will cost (or earn) you in your home currency. The hedge ratio lets you decide how much of the exposure to lock in: 100% removes all FX risk on that exposure but also removes any upside if rates move favorably. Lower ratios keep some skin in the game.
Forward rates and hedge cost
The forward rate is not a forecast — it's mathematically derived from the spot rate and the interest rate differential between the two currencies (covered interest rate parity). When the foreign currency has lower interest rates than the domestic currency, the forward rate is higher than the spot (forward premium). When higher, lower (forward discount). Hedge cost in this calculator is the dollar difference between spot and forward applied to the hedged amount — it's the explicit cost of certainty.