An exchange rate is the price of one currency in terms of another. To convert, multiply your amount by the rate: if 1 USD = 0.92 EUR, then 100 USD = 92 EUR. The rate you see on a converter is normally the mid-market rate, the midpoint between buying and selling prices. Banks, cards and transfer services usually give you a rate below that, and the gap is their margin. This guide explains how rates are quoted and calculated, why the rate you are offered differs, and how to work out the true cost before you convert. To try any pair, use our currency converter.
Converted amount = amount × exchange rate. Compare the rate you are offered with the mid-market rate: the percentage gap is the hidden cost. Total cost = margin + any fixed fee.
📑 Table of Contents
What an exchange rate is
An exchange rate always involves two currencies. The base currency is the one being priced, and the quote currency is the one you pay in. When a rate is written EUR/USD = 1.09, one euro (base) costs 1.09 US dollars (quote). Reversing the pair gives the inverse: if 1 EUR = 1.09 USD, then 1 USD = 1 ÷ 1.09 = 0.917 EUR.
Currencies trade in the foreign exchange (forex or FX) market, which is open around the clock on weekdays. Prices change constantly as banks, companies and investors buy and sell, and published daily reference rates are snapshots of those prices.
Mid-market, buy and sell rates
At any moment a currency has a price at which dealers will buy it (the bid) and a higher price at which they will sell it (the ask). The difference is the spread. The mid-market rate is the midpoint of the two, so it is a fair reference point, but not a rate any customer is guaranteed to get.
| Rate | What it is | Who sees it |
|---|---|---|
| Mid-market rate | Midpoint between buy and sell prices | Shown on search engines, news sites and converters |
| Bid / ask | The prices dealers buy and sell at | Banks, brokers, dealers |
| Retail rate | Mid-market rate adjusted by the provider's margin | Customers of banks, cards, exchange houses and transfer services |
The conversion formula and cross rates
For a direct pair, converted amount = amount × rate. Many converters store every currency against one anchor, such as the US dollar, and calculate other pairs through it. This is called a cross rate:
Rate from A to B = (units of B per 1 USD) ÷ (units of A per 1 USD)
Worked example. Suppose 1 USD = 0.92 EUR and 1 USD = 0.79 GBP. The EUR to GBP rate is 0.79 ÷ 0.92 = 0.8587. So 250 EUR = 250 × 0.8587 = 214.67 GBP. Going the other way, 1 GBP = 0.92 ÷ 0.79 = 1.1646 EUR. These rates are examples for the arithmetic, not current market prices.
What moves exchange rates
- Interest rates. Higher rates in a country tend to attract investors, which can strengthen its currency.
- Inflation. A currency in a country with persistently higher inflation tends to lose purchasing power against others.
- Trade and capital flows. Countries that import more than they export, or rely on foreign borrowing, face pressure on their currency.
- Economic and political stability. Uncertainty usually pushes money toward currencies seen as safe.
- Central bank policy. Interventions, reserves and announcements can move a currency quickly.
- Market sentiment. Expectations about all of the above matter as much as the data.
No one can reliably predict short-term moves, which is why a converter shows today's rate and not a forecast.
Pegged and managed currencies
Some currencies are fixed to another, usually the US dollar, so their rate barely changes. The UAE dirham has long been pegged at 3.6725 per US dollar, and the Saudi riyal at 3.75. The Hong Kong dollar floats inside a narrow band of 7.75 to 7.85 per US dollar. Others, like the Pakistani rupee or Indian rupee, are managed to different degrees, and the rate an exchange house quotes can differ from the official reference rate. For a pegged currency you can convert by hand: 100 USD × 3.6725 = 367.25 AED.
The real cost of converting money
The cost of exchanging money has two parts: the margin (how far the offered rate sits below mid-market) and any fixed fee. Calculate the margin like this:
Margin % = (mid-market rate − offered rate) ÷ mid-market rate × 100
Example: mid-market 0.9200 EUR per USD, offered 0.8924. Margin = (0.9200 − 0.8924) ÷ 0.9200 × 100 = 3%.
Margin plus fee. You send 500 USD and the provider charges a 5 USD fee and a 2% margin. The fee is taken first, leaving 495 USD. The offered rate is 0.92 × 0.98 = 0.9016, so you receive 495 × 0.9016 = 446.29 EUR. At the mid-market rate, 500 USD would be 460 EUR. You lost 13.71 EUR, which is 2.98% of the amount. A "low fee" can still be expensive if the margin is high, and a "no fee" offer can hide the cost in the rate.
| Sending 1,000 USD at a mid-market rate of 0.92 | You receive | Lost to margin |
|---|---|---|
| No margin | 920.00 EUR | 0 |
| 1% margin | 910.80 EUR | 9.20 EUR |
| 3% margin | 892.40 EUR | 27.60 EUR |
| 5% margin | 874.00 EUR | 46.00 EUR |
Where you convert matters
| Where | What to watch |
|---|---|
| Bank transfer | Often a fixed fee plus a margin that is not always shown; ask for the exact rate. |
| Online transfer service | Usually shows the rate and fee up front, so total cost is easy to compare. |
| Debit or credit card abroad | Network rate plus possible foreign-transaction fee from your issuer. |
| ATM withdrawal abroad | ATM operator fee and your bank's fee can both apply. |
| Airport or hotel exchange desk | Convenient, and usually the widest margins. |
| Local exchange house | Rates vary between shops, so compare two or three before exchanging. |
Providers change their pricing, so compare current quotes instead of relying on a general ranking.
Dynamic currency conversion
When you pay by card abroad, a terminal or ATM may offer to charge you in your home currency instead of the local one. This is dynamic currency conversion. It feels convenient because you see a familiar number, but the rate is set by the merchant's provider and usually includes a larger margin. Choosing the local currency lets your own bank or card network do the conversion, which is often cheaper.
A checklist before you convert
- Look up the mid-market rate for your pair and amount.
- Get the provider's exact rate and every fee in writing or on screen.
- Calculate the margin and add the fixed fee to find the total cost as a percentage.
- Compare two or three providers on the amount you will receive, not the headline fee.
- Decline conversion into your home currency at card terminals.
- Check the rate again at the time of payment, since it moves during the day.
Using the currency converter
Pick the pair
Choose the From and To currencies from 40 options, such as USD to PKR, GBP to USD or EUR to INR.
Enter the amount
The result updates as you type, with the rate shown both ways.
Add the provider's margin
Open "Add a bank or transfer fee" and enter the percentage to see what you would actually receive, for example 1,000 USD to EUR with a 3% margin.
Frequently Asked Questions
Conclusion
An exchange rate is just a price, and the only number that matters in the end is how much arrives after margin and fees. Look up the mid-market rate, compare it with the offer, and use the currency converter with the fee field to check the true cost before you send or exchange money.
This guide is general information, not financial advice. Exchange rates and provider fees change constantly, so check current quotes before you convert money.