Currency Swap Valuation Calculator
Values a currency swap mid-life by comparing the present value of domestic and foreign cash flow legs at current market rates and spot prices. Use it when marking a cross-currency swap to market or assessing counterparty credit exposure.
About this calculator
A currency swap is an agreement to exchange principal and interest payments in two different currencies. Its mark-to-market value changes as spot rates and interest rates evolve after inception. Using continuous compounding, the value to the domestic party is approximated as: Value = Notional × [( S_current / S_initial ) × e^(−r_f × T) − e^(−r_d × T)], where S_current is the current spot rate, S_initial is the spot rate at inception, r_f is the foreign continuous interest rate, r_d is the domestic continuous interest rate, and T is years remaining. The first term represents the present value of the foreign leg converted to domestic currency; the second term is the present value of the domestic leg. A positive result means the swap has value to the domestic party; negative means a liability.
How to use
Notional = $1,000,000, initial spot = 1.2000, current spot = 1.2500, domestic rate = 3%, foreign rate = 2%, years remaining = 2. Step 1: Foreign leg PV = 1.2500 / 1.2000 × e^(−0.02 × 2) = 1.04167 × e^(−0.04) = 1.04167 × 0.96079 ≈ 1.00082. Step 2: Domestic leg PV = e^(−0.03 × 2) = e^(−0.06) ≈ 0.94176. Step 3: Value = $1,000,000 × (1.00082 − 0.94176) = $1,000,000 × 0.05906 ≈ $59,060. The swap currently has a positive mark-to-market value of approximately $59,060 to the domestic party.
Frequently asked questions
What causes the value of a currency swap to change after it is entered into?
A currency swap's value changes primarily because of three factors: movements in the spot exchange rate, changes in domestic or foreign interest rates, and the passage of time. If the spot rate moves in favor of the domestic party (foreign currency appreciates), the present value of the foreign leg received increases, raising the swap's value. If domestic interest rates rise, the present value of the domestic leg paid decreases, also increasing value. Conversely, falling foreign rates or a depreciating foreign currency reduce the swap's worth. The interplay of all three factors makes continuous mark-to-market monitoring essential for risk management.
How is a currency swap different from a foreign exchange forward contract?
A currency swap typically involves multiple cash flow exchanges over the life of the agreement — including periodic interest payments in each currency and re-exchange of principal at maturity — whereas a simple FX forward involves only a single exchange at one future date. Swaps are therefore used for longer-term financing and liability management (e.g., converting a fixed-rate USD bond into a EUR liability), while forwards are used for short-term trade hedging. Both instruments eliminate FX uncertainty for the contracted amounts and dates, but swaps carry additional counterparty credit risk over their multi-year lives due to the ongoing exchange of cash flows.
Why do companies use currency swaps instead of simply borrowing in their preferred currency directly?
Companies often use currency swaps to exploit comparative borrowing advantages. A US firm may have better access to USD bond markets, while a European firm has cheaper access to EUR debt. By each borrowing in their respective home markets and then swapping obligations, both parties can achieve lower all-in funding costs than if each had borrowed directly in the foreign currency. This concept, rooted in comparative advantage theory, is the classic rationale for the currency swap market. Additionally, swaps allow companies to convert the currency of existing debt without refinancing, providing flexibility to match assets and liabilities across currencies.