As of the end of 2018, more than half of the global population is connected to and uses the Internet. To advance the UN Sustainable Development Goals, ICT infrastructure needs to be built out in unserved and underserved populations. ICT Infrastructure Business Planning Toolkit explores several key areas of development that needs to take place in order to get the whole world connected. These ICT infrastructure development tools include access to networks, regulatory policies, estimating broadband demand and revenues, estimating investments in fixed and mobile broadband, estimating operational expenses and weighted average capital costs, and reviewing the financing mechanisms of broadband infrastructure enablement. The toolkit is written for regulators and policy-makers to offer a clear and practical methodology for accurately evaluating the economic impact of broadband infrastructure and create effective infrastructure deployment plans.