Hi,
I have over 15 years of experience as Physics and Math teacher; but, I've also done some VA work, which included a lot of both Excel and MS Word work as well as some Access and VBS tinkering.
I will create this calculator in Excel (I'm proficient in creating Templates, Macros and complex formulas, conditional formatting, etc).
You're welcome to check my reviews and should you have any questions, I'll be happy to answer.
Kindest regards.
Milan