Trading Defined
Accounting, Tax and OperationsBeginner

Exchange RateFX

An exchange rate is the price of one currency in another; trading assets priced in a foreign currency adds currency conversion costs and exchange-rate risk.

Buy a European stock with dollars and you've made two bets: one on the company and one on the euro. The exchange rate decides how much of your foreign gain actually reaches your account.

Category
Accounting, Tax and Operations
Reading time
3 min
Also called
FX rate, Currency rate, Conversion rate
Updated

Exchange rates in plain words

An exchange rate is the price at which you can swap one currency for another.1

Investor.gov calls it a price — how much it costs to buy one country's currency with another's.2

On global currency markets, rates move all the time.1

How to account for exchange rates, step by step

  1. Read the pair

    Forex quotes come in pairs because you buy one currency with another.2

  2. Check the convention

    Quoting conventions differ by currency, market and system.2

  3. Use the real rate

    When you exchange currency, the rate comes from real-time market rates.1

  4. Add conversion costs

    Factor in currency conversion costs.3

  5. Translate returns

    Convert both entry and exit values to your home currency.

  6. Check controls

    Some countries restrict or delay moving currency out.3

Worked examples

Example 1 — Reading a quote

$2,200

A hypothetical EUR/USD quote is 1.10. You convert €2,000.

Example 1 — Reading a quote — calculation
Dollars€2,000 × 1.10 = $2,200

The quote is the price of one currency in another, so 1.10 means $1.10 per euro.2

Example 2 — Stock up, currency down

−$450 in dollars

A hypothetical US investor buys a European stock for €10,000 at 1.20 ($12,000). It rises 10% to €11,000 while EUR/USD falls to 1.05.

Example 2 — Stock up, currency down — calculation
Euro gain€11,000 − €10,000 = +€1,000 (+10%)
Dollar value€11,000 × 1.05 = $11,550
Dollar result$11,550 − $12,000 = −$450 (−3.75%)

A foreign investment can rise in its home market yet be worth less in dollars because of exchange rates.3

Example 3 — Conversion cost

≈ −1% round trip

A hypothetical broker charges 0.5% to convert $5,000 in and the same out, with no rate change.

Example 3 — Conversion cost — calculation
Cost in$5,000 × 0.5% = $25
Back out$4,975 × 0.5% ≈ $24.88
Total cost$25 + $24.88 = $49.88

Remember the cost of converting currency, which quietly reduces the return.3

Reference rate vs dealing rate

AspectReference rateDealing rate
PurposeInformation and statisticsActual conversion
SourceCentral bank publicationBroker or bank price
Includes spreadNo — an averageYes
UpdatedOnce a dayContinuously

Where exchange rates matter

  • Foreign stocks

    Converting cash to buy and sell abroad.

  • Forex trading

    Trading a Trading Pair directly.

  • Reporting

    Translating results into your home currency.

  • Hedging

    Using Hedging to reduce currency risk.

Advantages and disadvantages

Advantages

  • Opens access to foreign markets.
  • Currency moves can add to returns.
  • Published reference rates aid comparison.

Disadvantages

  • Currency moves can wipe out gains.
  • Conversion costs reduce returns.
  • Quote conventions can confuse.
  • Capital controls can trap money.

Going deeper

Read as far as you need. Each level builds on the one before it.

A price for money

Beginner

An exchange rate is a price for buying one currency with another.2

Reference vs market rates

Intermediate

Official ECB reference rates are averages of buy and sell quotes, so the rate you actually get may differ.1

Currency risk in returns

Advanced

Changing exchange rates can turn a local gain into a home-currency loss, and currency controls can delay getting money out.3

Common mistakes

  1. Ignoring the currency leg

    Judging a foreign stock only by its local price.

  2. Misreading the quote

    Inverting a pair like USD/JPY.

  3. Using reference rates for trades

    Expecting to deal at a published average.

  4. Forgetting conversion fees

    Leaving round-trip costs out of returns.

Check your understanding

Test yourself before moving on. Each answer comes with an explanation.

Q1You convert $1,000 to euros at EUR/USD 1.25. How many euros?
Q2A foreign stock rises 5% locally while its currency falls 8% against yours. Roughly what is your return?

Key points to remember

  1. An exchange rate is a currency's price in another.
  2. Rates change constantly.
  3. Foreign returns depend on the currency too.
  4. Conversion costs add up.
  5. Reference rates are not dealing rates.

Frequently asked questions

Why does my broker's rate differ from the news?

Published rates are often mid-market or reference averages; dealing rates include a spread.

Can I avoid currency risk?

You can reduce it with hedged funds or currency hedges, at a cost.

Are FX gains taxed?

Often, but the treatment differs by country.

Further learning

Sources

This article is written in our own words. The sources below support the specific facts, rules and figures marked with a number in the text. Links open the original publisher’s page.

  1. European Central Bank. What is the role of exchange rates? (opens in a new tab) Checked .
  2. Investor.gov (SEC). Foreign Currency Exchange (Forex) Trading For Individual Investors (opens in a new tab) Checked .
  3. Investor.gov (SEC). International Investing – Investor Bulletin (opens in a new tab) Checked .

Educational content, not financial advice. Examples use hypothetical prices and simplified costs; actual fees, margin rules and regulations vary by broker, market and country. We are not affiliated with any publisher linked above. Last reviewed . Report an error or request a source credit.