Countries are developing roadmaps for the introduction and scale-up of national Multiple Micronutrient Supplementation (MMS), including background, strategy, implementation plan, and financing plan. As part of this roadmap, the implementation plan for MMS introduction and scale-up is to be costed, which then informs the funding requirements and an appropriate financing strategy and plan. The purpose of this tool is to support country stakeholders in costing their MMS implementation plan, to identify the funding requirements, inform the development of a financing/resource mobilization plan, and to serve as an aide to continue to update the country’s costing and financing plans.