How do scientists estimate crowd sizes at public events – and why are they often disputed?

By Milad Haghani, Associate Professor and Principal Fellow in Urban Risk and Resilience, The University of Melbourne
Ruggiero Lovreglio, Professor in Digital Construction and Fire Engineering, Te Kunenga ki Pūrehuroa – Massey University

Last Sunday, tens of thousands marched across the Sydney Harbour Bridge in support of Gaza. But exactly how many people were there depends on whom you ask.

Police put it at about 90,000. Organisers claimed up to 300,000. Other reports and expert estimates landed…

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