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Room occupancy estimation technology has been shown to reduce building energy cost significantly. However speech-based occupancy estimation has not been well explored. In this paper, we investigate energy mode and babble speaker count methods for estimating both small and large crowds in a party-mode room setting. We also examine how distance between speakers and microphone affects their estimation accuracies. Then we propose a novel entropy-based method, which is invariant to different speakers and their different positions in a room. Evaluations on synthetic crowd speech generated using the TIMIT corpus show that acoustic volume features are less affected by distance, and our proposed method outperforms existing methods across a range of different conditions.