When hedging helps
Hedging can reduce exchange-rate volatility, tighten tracking to a home-currency benchmark, and better match foreign assets to home-currency spending or liabilities.
Currency Impact on Investment Returns Calculator
Worked example
A UK investor buys a USD asset. The asset gains 8% in USD, and the exchange rate rises from 0.80 GBP per 1 USD to 0.84 GBP per 1 USD. The currency move is 5.00%, so the home-currency return is (1.08 × 1.05) − 1 = 13.40%.
Currency and display options
The currency you measure your final return in.
The currency the asset is priced in locally.
Advanced notation: S0 is the start rate and S1 is the end rate.
Shown before amounts in home currency.
Affects formatted outputs only.
Mode
Tip Use the same quote direction for start, end, and forward rates.
Unhedged Return
Total home-currency return: (1 + Rlocal) × (S1/S0) − 1
Home per 1 foreign. Advanced notation: S0.
Home per 1 foreign. Advanced notation: S1.
Hedged (Forward) Return
Approx hedged return: Rlocal + (F/S0 − 1) (over the hedge period)
Home per 1 foreign. Advanced notation: S0.
Use the same quote direction as the start exchange rate.
We show simple annualized figures if provided.
E.g., 15 bps = 0.15% drag over the period.
Scenario (Amount-Based)
Home end value: Amount × (1+Rlocal) × (S1/S0) (unhedged)
Home per 1 foreign. Advanced notation: S0.
Home per 1 foreign. Advanced notation: S1.
Break-even FX for Target Home Return
Needed FX ratio: S1/S0 = (1+Rtarget)/(1+Rlocal)
Home per 1 foreign. Advanced notation: S0.
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Results
Unhedged home-currency return: 13.40%
Local asset return8.00%
Currency return5.00%
Interaction effect0.40%
Total GBP return13.40%
| Starting home amount | £10,000.00 |
|---|---|
| Ending home amount | £11,340.00 |
| Gain/loss from asset performance | £800.00 |
| Gain/loss from FX translation | £540.00 |
Hedged vs unhedged comparison
| Measure | Unhedged | Hedged forward |
|---|---|---|
| Total home-currency return | 13.40% | 9.73% |
| FX contribution | 5.00% | Replaced by forward carry |
| Hedge carry | Not hedged | 1.88% |
| Hedge fee drag | 0.00% | -0.15% |
| Hedged minus unhedged | -3.68% | |
The USD asset gained 8.00% locally, and the currency move added 5.00%, producing a 13.40% GBP return after the 0.40% interaction effect.
Keep the FX direction consistent. Hedged results assume a simple forward hedge over the same period.
How Exchange Rates Affect Foreign Investments
A foreign investment has two linked return drivers: the asset's local return and the exchange-rate move between the asset currency and your home currency. With rates entered as home currency per 1 foreign currency, the core formula is:
Home return = (1 + local return) × (S1 / S0) − 1
When hedging can hurt
A hedge can remove a favorable currency move. It can also add fee drag, bid-ask costs, roll costs, and negative carry when forward points move against you.
Forward points and interest-rate differentials
A forward rate is usually not just today's spot rate. It reflects the interest-rate differential between the two currencies, which shows up as hedge carry.
Common mistakes
Mixing quote directions, comparing different time periods, ignoring hedge fees, and forgetting the interaction term can all make an FX return estimate misleading.
Methodology and Assumptions
- Unhedged return: (1 + local return) × (end exchange rate / start exchange rate) − 1, after converting any quote direction into home per 1 foreign.
- Hedged return: local return + (forward rate / start exchange rate − 1) − hedge fee. This is a simple single-period forward approximation.
- Breakdown: local asset gain is measured at the starting exchange rate; FX gain or loss is the remaining change from translating the ending foreign value.
- Not included: taxes, dividends, fund expense ratios, trading spreads, withholding tax, slippage, margin, rebalancing, and multi-period hedge rolls unless you enter them as part of the fee.
- Limitations: forward hedging can differ in practice because of contract size, collateral, settlement timing, basis, liquidity, and roll execution.
This calculator is for general financial information and education. It is not investment, tax, legal, or financial planning advice.
Background references:
FAQ
How do exchange rates affect investment returns?
They change the value of the foreign-currency investment when it is translated back into your home currency. A favorable currency move can lift returns; an unfavorable move can reduce or erase them.
What is currency risk?
Currency risk, also called exchange-rate risk or FX risk, is the chance that exchange-rate changes alter the home-currency value of a foreign investment.
How do I calculate foreign investment return in my home currency?
Multiply the local asset growth factor by the exchange-rate growth factor, then subtract 1. For example: (1 + 8%) × (0.84 / 0.80) − 1 = 13.40%.
What does currency hedging do?
Hedging uses forwards, futures, swaps, options, or hedged funds to reduce the effect of future spot exchange-rate moves for a chosen period.
Is hedging currency risk worth it?
It can be worthwhile when you need lower volatility or home-currency certainty. It may be less useful when costs are high, the horizon is long, or you are comfortable with FX exposure.
Why can a foreign investment gain locally but lose in my currency?
If the foreign currency weakens enough against your home currency, the translation loss can outweigh the asset's local gain.
What exchange rate direction should I use?
Use either home per 1 foreign or foreign per 1 home, but keep it consistent for every rate. This calculator lets you choose the quote direction and handles the conversion internally.