The rupee today strengthened by 12 paise to trade at 46.51 a dollar at the Interbank Foreign Exchange on continued capital inflows by foreign funds.Dealers said continued capital inflow by foreign funds and weakness in dollar at overseas markets mainly provided support to the rupee.The rupee had ended 21 paise higher at 46 rupees 64 paise against the US currency yesterday after the dollar hit a 15-year low against the Japanese yen.