What Is a Currency Converter?
A currency converter is a tool that calculates the value of one currency in terms of another. It uses exchange rates — the relative values between currencies — to perform the conversion. Whether you're traveling, shopping from international sites, sending money abroad, or running a business, a reliable converter saves time and prevents costly mistakes.
How Exchange Rates Work
An exchange rate tells you how much one currency is worth in another. For example, if 1 USD = 0.92 EUR, it means one US dollar buys 0.92 euros. Exchange rates fluctuate constantly based on:
- Supply and demand — how much of each currency buyers and sellers want
- Interest rates — central bank decisions affect currency attractiveness
- Inflation — countries with lower inflation tend to have stronger currencies
- Economic indicators — GDP, employment, trade balances
- Political events — elections, policy changes, geopolitical tensions
- Market speculation — traders betting on future movements
How to Use This Converter
- Enter an amount — the value you want to convert.
- Choose the "From" currency — the currency you have.
- Choose the "To" currency — the currency you want.
- Click "Convert" — or use the swap button to reverse the pair.
- Click any quick pair — for popular currency combinations.
Exchange Rate Sources
This tool uses the open.er-api.com endpoint provided by ExchangeRate-API. It's a free, open-access service that returns rates for over 160 currencies. Key facts:
- No API key required — works instantly
- Updated daily — rates reflect the previous business day's close
- Attribution — the service requests a link back to exchangerate-api.com
- Rate limited — sensible request patterns avoid limits
Understanding Mid-Market vs. Retail Rates
The rates you see here are mid-market rates — the midpoint between buy and sell prices on the global market. This is the "real" exchange rate you'll find on Google or Reuters.
However, when you actually exchange money, you typically get a retail rate that's 1–5% worse than mid-market. That markup is how banks, currency exchange offices, and payment services make their money. Always compare the effective rate you're offered against the mid-market rate to understand the true cost.
Common Use Cases
- Travel planning — estimate how far your money will go in another country.
- Online shopping — convert prices on international websites.
- Freelancing — invoice international clients in their currency.
- Remittances — send money to family abroad and check how much arrives.
- Business — quote prices, track costs, and manage multi-currency accounts.
- Investing — convert portfolio values and dividends from foreign markets.
- Education — understand exchange rate math and currency markets.
Fees and Spreads
When converting money, watch out for:
- Exchange rate markup — the difference between mid-market and retail rates
- Fixed fees — flat charges per transaction
- Hidden costs — some services advertise "no fees" but bake them into the rate
- Weekend surcharges — some providers charge more when markets are closed
To compare fairly, always calculate the effective rate: the amount you actually get divided by the amount you sent. Then compare that to the mid-market rate.
Why Rates Change Daily
Exchange rates update continuously during market hours (Sunday evening to Friday evening, UTC). This tool fetches the latest daily rate, which reflects the previous business day's close. For most everyday conversions, this is accurate enough.
If you need second-by-second accuracy — for example, for high-volume trading — you'd need a real-time feed, which typically requires a paid API.
Frequently Asked Questions
- Is this converter free? — Yes, completely free with no signup or API key.
- How many currencies are supported? — Over 160, including major, minor, and some historical currencies.
- Are rates real-time? — They're updated daily, reflecting the latest available close.
- Why is the rate slightly different from my bank? — Banks apply a retail markup. The mid-market rate here is the "fair" rate.
- Is my data private? — Yes. Conversion happens entirely in your browser. Only the rate data is fetched from the API.
Related Tools
Attribution
Exchange rate data provided by ExchangeRate-API.
Privacy Note
Your amounts and conversion choices never leave your browser. Only the exchange rate data is fetched from the API — no personal information is sent.