sgd to idr1 SGD = 12,676.7785 IDR Exchange rates may vary. Fees may apply. Singapore Dollars to Indonesian Rupiahs: exchange rates SGD. IDR. 1 SGD, 12,628.63 IDR.The SGD to IDR exchange rate has experienced some fluctuations over time. Over the past week, the rate fell by -0.35%. Over the past month, it saw a -1.67% dec. Over the last year,