As the UN High-Level Forum on Sustainable Development continues this week, member states and civil society are taking a hard look at countries’ progress toward securing safe drinking water, sanitation, and adequate housing. Achieving these and the other Sustainable Development Goals (SDGs) requires recognizing the synergies among them—including the role that reproductive health and family planning can play. You may ask, “Why does family planning matter for the SDGs not related to health?” The answer is that it is one of the most cost-effective investments for achieving the SDGs. Increasing access to family planning provides sweeping social, economic, and environmental benefits for every dollar spent.