Abstract: A computer-implemented method of estimating leakage power of a circuit design may include: obtaining waveform data by performing a functional simulation on a circuit design according to reference input signals; obtaining leakage power data by calculating power consumption of the circuit design according to the waveform data; generating a leakage power model of the circuit design based on the waveform data and the leakage power data; and estimating leakage power of the circuit design by performing a functional simulation on the circuit design according to test input signals on a basis of the leakage power model.