Currency Carry Trade Calculator
Estimates the gross profit from a currency carry trade by borrowing in a low-yield currency and investing in a high-yield one. Useful for forex traders evaluating leveraged carry strategies before execution.
About this calculator
A currency carry trade exploits interest rate differentials between two currencies: a trader borrows in a low-interest-rate currency and simultaneously holds a position in a high-interest-rate currency, earning the spread. The gross carry profit formula is: Profit = Investment × Leverage × (High-Yield Rate − Low-Yield Rate) / 100 × (Trading Days / 365). The investment amount scaled by leverage gives the total notional exposure. The annualized rate differential is then pro-rated over the holding period expressed in days. Note that this formula calculates gross carry income only — it does not account for exchange rate movements, broker rollover fees, or bid-ask spreads, all of which can significantly erode or eliminate the profit.
How to use
Assume you invest $10,000 with 10× leverage, holding AUD (rate 4.25%) against JPY (rate 0.10%) for 30 days. Step 1: Rate differential = 4.25% − 0.10% = 4.15%. Step 2: Notional exposure = $10,000 × 10 = $100,000. Step 3: Profit = $100,000 × (4.15 / 100) × (30 / 365) = $100,000 × 0.0415 × 0.08219 ≈ $341.10. The estimated gross carry profit over 30 days is approximately $341. Remember this does not include any adverse currency moves or transaction costs.
Frequently asked questions
What are the main risks of a currency carry trade strategy?
The biggest risk is a sudden, sharp reversal in the exchange rate that wipes out accumulated carry income — known as a carry trade unwind. Because carry trades are typically highly leveraged, even a modest adverse currency move can result in losses many times larger than the interest earned. Carry trades also tend to suffer during periods of market stress, as investors simultaneously exit positions in risky, high-yield currencies and flee to safe havens like the Japanese yen or Swiss franc. Liquidity risk and gap risk (overnight price jumps) further compound the danger for leveraged positions.
How does leverage affect carry trade profits and losses?
Leverage amplifies both the interest income and the potential loss from currency moves in direct proportion. A 10× leverage ratio turns a $10,000 investment into $100,000 of notional exposure, multiplying carry income tenfold — but also multiplying any exchange rate loss tenfold. For example, a 1% adverse currency move on a 10× leveraged position erases 10% of the original equity. Traders must carefully size positions so that a realistic adverse scenario does not trigger a margin call before the carry income has time to accumulate. Lower leverage extends survivability during volatile periods.
Why do carry trades tend to collapse suddenly rather than unwind gradually?
Carry trades are often crowded — many traders hold similar positions simultaneously — so when sentiment shifts, everyone rushes for the exit at once. This creates self-reinforcing feedback: selling the high-yield currency drives it lower, triggering stop-losses and margin calls, which force more selling. The high-yield currency can depreciate far faster than the accumulated carry income can offset. Historically, currencies like the AUD and NZD have experienced sharp declines during global risk-off episodes (e.g., 2008 financial crisis), devastating leveraged carry traders almost overnight despite years of steady accumulation.