Exchange rate source
The tool requests a daily exchange rate table using USD as the base currency, then calculates cross-currency values in the browser. If rates were fetched recently, the page uses the locally cached copy instead of making another request.
Conversion formula
For a direct USD conversion, the calculator multiplies the amount by the target currency rate. For non-USD pairs, it first normalizes through USD and then converts to the target currency.
Why provider rates differ
Banks, card networks, airport exchange desks, brokers, and money transfer providers may add spreads, fees, or timing differences. Treat this page as a planning estimate, not a quote for a transaction.
When to refresh
Daily rates are usually enough for travel budgets and quick comparisons. For trading, wire transfers, tax reporting, or large payments, verify the live rate with the institution handling the transaction.