create a Weight calculator

Hello! I need a "Weight Calculator" for my (wordpress) website. The functionality should be the same as in this one: [login to view URL] People must enter 3 variables (height - gender - age) and the calculator shall show 9 different results. If you scroll to BOTTOM of [login to view URL], there are all the formulas for each calculation. (I will provide a document with a detailed description + all the formulas) I am not a programmer and don't know how long it takes - but with the formulas it should no be too difficult, and ideally it would not be more than 30 $. One important extra: I will use it on a wordpress website, It should be easy to apply a custom (and mobile responsive) CSS styling later on. (IDs, classes... ?) If you read this, please just let me know if you did a calculator before. Thank you!