Currency Hedging Calculator
Estimate the cost of hedging a foreign-currency exposure using a forward contract, based on the gap between the spot and forward rates. Use it when locking in exchange rates to protect revenues, costs, or investments denominated in a foreign currency.
About this calculator
Currency hedging with a forward contract locks in today an exchange rate for a future transaction, eliminating uncertainty about adverse currency moves. The hedging cost reflects the premium or discount embedded in the forward rate relative to the current spot rate. The formula used is: Hedge Cost = exposureAmount × hedgeRatio × |forwardRate − spotRate| / spotRate × (maturityDays / 365). The hedge ratio (0 to 1) specifies what fraction of the total exposure is covered — a ratio of 1 means full coverage. Dividing by the spot rate converts the absolute rate difference into a proportional cost, and the maturity fraction adjusts for the length of the contract. A positive result means the forward is at a premium to spot (typically when the hedged currency has higher interest rates), representing the annualised cost of protection.
How to use
A US company has a €500,000 payable due in 180 days. Spot EUR/USD = 1.0800, 180-day forward = 1.0950, hedge ratio = 1.0. 1. Rate difference: |1.0950 − 1.0800| = 0.0150 2. Proportional cost: 0.0150 / 1.0800 = 0.01389 3. Time fraction: 180 / 365 = 0.4932 4. Hedge Cost = 500,000 × 1.0 × 0.01389 × 0.4932 ≈ $3,427 The forward hedge costs approximately $3,427 on a €500,000 exposure for 180 days — roughly 0.69% of exposure, the price of certainty on the payable.
Frequently asked questions
What is the difference between a hedge ratio of 0.5 and 1.0 in currency hedging?
A hedge ratio of 1.0 means you cover 100% of your currency exposure with a forward contract, completely eliminating exchange-rate risk on that position. A ratio of 0.5 means only half the exposure is hedged, leaving the other half subject to market movements. Partial hedging is common when companies want to benefit from potentially favourable currency moves while still limiting downside risk. The optimal hedge ratio depends on risk tolerance, hedging costs, the correlation between the currency and underlying business cash flows, and accounting treatment of the hedge.
Why is the forward rate different from the spot rate in a currency hedge?
The forward rate differs from the spot rate because of the interest rate differential between the two currencies, as described by the Interest Rate Parity (IRP) theory. If the domestic interest rate is higher than the foreign rate, the domestic currency trades at a forward discount — meaning the forward rate is lower than spot. Conversely, a lower domestic rate produces a forward premium. This difference is not speculation; it is an arbitrage-free adjustment that prevents riskless profit from borrowing in one currency and investing in another. The cost or benefit of a forward hedge therefore reflects prevailing interest rate differentials, not the market's directional view on the currency.
When should a business use currency hedging versus accepting natural FX risk?
Businesses should consider hedging when foreign-currency cash flows are large relative to profit margins, making an adverse move potentially devastating to financial results. Companies with thin margins — such as exporters or manufacturers — are especially vulnerable because a 3-5% currency move can eliminate an entire year's profit. Natural hedging (matching revenues and costs in the same currency) is preferable where feasible, as it incurs no direct cost. When natural hedging is insufficient, forward contracts or options offer protection, with forwards being cheaper but inflexible and options more expensive but allowing participation in favourable moves. The hedging decision should also consider accounting standards (IFRS 9, ASC 815) that govern how hedge gains and losses are recognised.