I noticed that the most commonly used final exam grade calculators have outdated and unresponsive UIs. To modernize the process, I created my own calculator website. Nothing new, nothing complicated; just modern.
This website calculates a minimum exam grade necessary to reach a target grade from a current grade given the exam's weight. This value is computed in the backend by using the equation:
minimumExamGrade = (targetGrade - (1 - (examWeight / 100)) x currentGrade) / (examWeight / 100)
This website is permanently hosted on GitHub pages. You can visit it here: https://sxzo.github.io/Exam-Grade-Calculator/