As of September 2021:
Critical: Exchange rates fluctuate daily. Current rate (2024) is ~15,500 IDR/USD → 1,000 IDR ≈ $0.064. Always check a live converter (XE, OANDA, Google, bank) before transacting.
Indonesia redenominated in 1965 (1 new = 1,000 old). "Seribu Rupiah" notes/coins are low-denomination everyday currency.