Money converter

This tool provides a precise IDR to NTD currency conversion using either the latest market rate or a user-specified historical rate. It is intended for travelers budgeting Taiwan trips, exporters invoicing in IDR, freelancers billing in NTD, and finance teams performing quick scenario planning. Input is limited to IDR as the source and NTD as the target, ensuring consistent pairwise conversion while enabling easy scenario planning.

Conceptually, the tool fetches a rate from a centralized data feed, multiplies the input amount by that rate, and outputs the converted figure with two-decimal precision. The underlying logic handles edge cases such as missing data by falling back to the nearest available rate and by signaling when a date is outside the historical window. A currency swap option allows reverse calculations without retyping.

Core value lies in speed, reproducibility, and exportability. Users can export results for records, invoicing, or budgeting. It reduces manual rate lookups, minimizes calculation errors, and provides a transparent audit trail for each conversion.

Use cases include estimating travel costs in NTD for IDR-based budgets, preparing invoices in NTD for Indonesian vendors, and performing what-if analyses for 1,000, 5,000, or 50,000 IDR scenarios.