Currency converter
Live & historical daily rates from your choice of US or EU provider.
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About this tool
Convert between 160+ currencies using daily reference rates from a US-based provider (ExchangeRate-API, USD base). Rates are cached in your browser for 24 hours so the converter still works offline after the first use - handy on a plane or in a hotel with patchy Wi-Fi.
Useful for quick travel budgets, freelance invoices in a foreign currency, shopping abroad, eyeballing whether that thing on a foreign website is actually a good deal, and double-checking a bank's exchange rate before transferring money. Not intended for trading or formal settlement - the rates are reference data, not live market quotes.
Behind the scenes, every currency is converted via USD as the base, which is how most reference rate feeds work. The maths is exact (no rounding errors in intermediate steps), and the result is rounded to two decimal places for display because that's what people actually want to see.
Features
- Daily USD-based reference rates from ExchangeRate-API
- 160+ currencies including all major and most minor ones
- 24-hour local cache - works offline after first load
- Two-way conversion in a single field
- Rounded to the conventional decimal places per currency
- No signup, no API key, no rate limit on the user side
How to use it
- Enter an amount in either field.
- Pick the source and target currencies from the dropdowns.
- Read the converted value - both fields update as you type.
Everything happens inside your browser using JavaScript and WebAssembly. Your files are never uploaded to a server, never stored, and never seen by us.
Frequently asked questions
The provider updates daily. Rates are cached locally in your browser for 24 hours; close and reopen the tab after a day to pull new ones. For a casual conversion this is plenty fresh; for anything money-sensitive, check your bank's actual rate.
No. Reference rates are for information only - they don't include the spreads, fees, or live order-book pricing a real exchange would charge. For trading, use a real broker; for sending money internationally, use your bank's quoted rate or a service like Wise that quotes the full all-in price.
Banks and card networks add a spread (often 1-3%) on top of the reference rate, plus sometimes a flat fee. The reference rate you see here is the wholesale mid-market rate; the rate you actually get is always worse by some margin.
Not in this version. The rate feed covers traditional fiat currencies. Crypto rates change too fast for a 24-hour cache to be meaningful anyway - use a dedicated crypto price feed if that's what you need.