Historical Currency Converter

About This Tool

The tool provides date-specific currency conversions using OANDA historical rates. It enables analysts, treasury teams, and researchers to reproduce FX values for a chosen date and currency pair.
Core logic fetches the historical rate for the requested date, applies it to the input amount, and returns the converted value, the rate used, and the date. It validates ISO currency codes and enforces that the date falls within the data coverage.
How it works conceptually: for a given date, it locates the rate for from_currency to to_currency; if that date is a weekend or holiday, it uses the nearest prior business day; it then computes converted_amount = amount * rate and reports the exact rate and source. This yields an auditable result suitable for financial models, pricing, and reporting.
Unique value lies in combining date specificity with a reliable FX data source, build-time audit trails, and straightforward exports for records. Core features include input validation, currency code checks, historical lookups, and optional rounding and batch support. Use cases include budgeting across quarters, historical pricing analyses, and travel budgeting where precise historical rates matter.

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