Currency Converter
Convert 30 currencies with dated daily rates; historical rates are clearly marked.
Enter a nonnegative number, for example 1.5. Decimal notation and exponents are supported; see Method for input limits.
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Method
Convert amounts using both factors from one validated USD-based snapshot. ExchangeRate-API updates indicative rates about daily; source date and attribution stay visible. A missing pair uses both built-in rates dated 2024-03-01, never mixed with a newer factor. Same-currency identity has no exchange quote. A source older than 48 hours is marked stale. Synthetic USD 1/EUR 2 gives 100 USD → 200.00 EUR. Amounts at least 1 use two decimals; smaller amounts use six significant digits; quotes use six decimals with scientific notation for tiny nonzero values. Fees, spreads and settlement minor-unit rules are excluded. No real-time, executable or crypto quote is provided.
Scalar input: at most 256 UTF-16 units, 100 significant digits and exponent −100…100. Use complete decimal numbers; no suffixes or grouping in single mode. Dot is decimal; a decimal comma is also accepted only in comma-decimal locales. Negative quantities are rejected; zero is valid, empty is not zero.
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About Currency Converter
Convert 30 currencies with dated daily rates; historical rates are clearly marked.
USD 1 / EUR 2 → 100 USD = 200.00 EUR
Historical built-in rates · 2024-03-01
Use Cases
How to use
Enter an amount
Select source currency
Choose target currency
View the converted amount
Pro Tips
- ExchangeRate-API updates indicative rates about daily; source date and attribution stay visible.
- Bank rates may include fees
- Check multiple sources for large amounts
Frequently Asked Questions
Convert amounts using both factors from one validated USD-based snapshot. ExchangeRate-API updates indicative rates about daily; source date and attribution stay visible. A missing pair uses both built-in rates dated 2024-03-01, never mixed with a newer factor. Same-currency identity has no exchange quote.
A source older than 48 hours is marked stale. Synthetic USD 1/EUR 2 gives 100 USD → 200.00 EUR. Amounts at least 1 use two decimals; smaller amounts use six significant digits; quotes use six decimals with scientific notation for tiny nonzero values. Fees, spreads and settlement minor-unit rules are excluded. No real-time, executable or crypto quote is provided.