Currency Converter 💱
Convert between major currencies using built-in reference rates. You can also customize the exchange rate — all in your browser, instant results.
About the Currency Converter
This currency converter runs entirely in your browser. It ships with reference exchange rates relative to USD for ten major currencies, and you can override the rate for any pair. Nothing is uploaded to a server — all calculations happen instantly with JavaScript on your device.
How the conversion works
The converted amount is computed as:
Result = Amount × Rate
Where Amount is the value in the source currency and Rate is how many units of the target currency equal one unit of the source currency. When you change the From/To currencies, the rate field auto-fills with the built-in cross rate (target rate ÷ source rate, both relative to USD). You can edit it to use your own rate.
Frequently asked questions
Does this tool upload my data? No. All calculations happen locally in your browser. Your inputs never leave your device.
Are the rates live? No. The built-in rates are static reference values and may be outdated. For transactions, always confirm the current rate with your bank or provider. You can paste a fresh rate into the rate field.
Which currencies are supported? USD, EUR, GBP, JPY, CNY, KRW, AUD, CAD, CHF, and HKD.
Can I use a custom rate? Yes. Edit the exchange rate field directly — the conversion updates with whatever value you enter.