Birr Converter

This tool provides ETB currency conversions against major currencies by applying either a live rate feed or a user-supplied rate. It focuses on accuracy, traceability, and reproducibility for budgeting and invoicing in ETB. Conceptually, the system maintains a rate table with direct ETB_to_to entries and cross-rate paths when a direct pair is unavailable. The calculation engine multiplies the input amount by the selected rate and formats the result to two decimals for clear presentation. The design supports cross-rate derivations via common bases like USD to minimize API calls while preserving precision. Use cases include pricing ETB-denominated goods for international buyers, budgeting in ETB for expatriate teams, and preparing quotations for Ethiopian clients.

Unique value comes from the explicit handling of offline scenarios through manual rate input and deterministic rounding rules, which improves auditability for accounting workflows. The tool separates data inputs (amount, from_currency, to_currency, rate_source) from outputs (converted_amount, rate_used, timestamp) to enable reproducible calculations in reports. The approach supports both direct ETB pairs and cross-rate paths, ensuring conversions remain possible even when a direct market quote is temporarily unavailable. This makes it suitable for small businesses, freelancers, and travel planning where ETB plays a central role in pricing decisions.

Core features include validation of ISO currency codes, two-decimal display, and optional rate_source selection. Localized formatting aligns with common financial practices, and the system logic clearly documents the conversion path used for each result to support audit trails and compliance checks.