Currency Converter

Convert between currencies using live rates from free public APIs. All calculations are performed in your browser.

Live FX API Client-side
Last updated:
Source: open.er-api.com
Inputs
Fetch rates and convert instantly
Cross-rate math is done locally
Result
Initializing…
Converted Amount
Rate (From → To)
Inverse (To → From)
Disclaimer: Rates are for reference only and may differ from your bank or card provider.
How it works
  1. On load, the tool fetches USD-based rates from open.er-api.com.
  2. Select currencies and enter an amount — conversion happens instantly.
  3. You can refresh rates at any time or swap the currency directions.
  • Cross-rate formula: rate(from→to) = rates[to] / rates[from], using a single base table.
  • Rates are cached locally for 12 hours to minimize API calls.
  • Fallback providers: exchangerate.host, frankfurter.app.