Calculus principles span nearly every STEM field, from physics to coding. Just as learning a new language offers a different perspective of the world, calculus offers a different perspective on a variety of disciplines. It helps bring many theoretical concepts into practice; as such, it would be very nearly impossible to avoid in almost many fields. In my chosen field of environmental science, it is especially important in helping to model real-world problems, offering a new understanding of systems with several complex variables. Understanding the relationships between those variables, even in the controlled or simplified setting of a model, can offer a more holistic perspective on the interrelatedness of ecosystems, which is especially important in management and restoration. Narrow understandings lead to narrow-minded solutions; more accurate models, born out of calculus-based concepts, can help to implement more effective and long-lasting strategies for ecological preservation. The benefits of complex modeling are certainly not limited to environmental science; in many STEM fields, this is a crucial aspect. Calculus allows us to study the convergence of several variables and their relationships, offering a more complete picture of complex systems. Calculus also offers solid ground in an ever-changing field. Theoretical concepts are constantly revised, and even rewritten as new evidence comes to light. These changes are often supported and fueled by mathematical interpretations. It was mathematical calculations that added evidence to the then-new theory of heliocentricity. Math is at the heart of almost every theory in physics. It is also the backbone of data analysis and interpretation. Theories can be debated and changed, but correct calculations based on accurate data are much more difficult to disagree on. Mathematics, and calculus in particular, is the one field in STEM that does not go through such upheavals that it must rebuild from the ground up. Technological innovations and scientific breakthroughs can alter a field to its core, but calculus, in its principles and methods, have mostly stood the test of time. New methods are discovered, new disciplines created, but at its core, calculus has remained unchanged; it is both ironic and unsurprising, as calculus is the study of change itself. In an ever-changing field, the study of change will never cease to be of need. These two aspects of calculus, its grounding nature and its holistic approach, make it indispensable in STEM fields. It leads to more complete understandings of complex systems, and offers consistency in data analysis and the measure of change. Calculus has offered me a deeper understanding of the STEM fields I am interested in studying, which is why, as a mathematics minor, I am looking forward to applying those calculus concepts in my career.