The document describes a Green Jobs Calculator tool developed by UNDP Croatia to estimate the number of green jobs created and environmental benefits of transitioning to renewable energy and improving energy efficiency. The tool takes inputs on planned investments in various low-carbon technologies and estimates direct and indirect jobs, greenhouse gas reductions, and costs/benefits to society over time. Initial model results for Croatia suggest that while costs exceed benefits in early years, long-term impacts are positive across health, environment, employment and economic indicators. The tool is intended to help policymakers and the public optimize energy choices for sustainable development.