A critical building block to achieving the global goal of universal hand hygiene by 2030 is adequate levels of funding. Understanding the costs of implementing hand hygiene plans is an essential precursor to fund allocation. This tool aims to provide country-specific cost estimates of achieving universal hand hygiene in households by 2030. It has been developed jointly by WHO and UNICEF, through a consultancy with WASHeconomics, and with input from the London School of Hygiene and Tropical Medicine, the World Bank and WaterAid