In this real-world STEAM challenge, students are tasked with designing a smart calculator that evaluates the ecological footprint of a daily diet. The tool is developed using Excel or programming languages like HTML and is tailored to calculate both calorie requirements and the environmental impact of different food choices. Students start by identifying key user parameters such as age, height, and physical activity level. They then gather and analyze data related to the calorie content and ecological footprint (e.g., carbon emissions, water use) of various food types including vegetables, meats, grains, and dairy. By integrating this data into their calculator, students enable users—such as nutritionists or eco-conscious individuals—to build personalized meal plans that align with both health goals and environmental sustainability. As food combinations are selected, the calculator instantly displays the total calorie count and ecological footprint, helping users make informed decisions. This project blends environmental science, health, digital literacy, data analysis, and sustainable thinking, empowering students to create practical tools that address global challenges.