I would like do this job for you.
I prepared fully working BMI calculator demo:
- with nice look
- basic RWD (is scalable to small screen resolutions = "old" mobile)
- extended classification of BMI ranks (Severely underweight, Underweight, Healthy weight (normal), Overweight , Moderately obese, Severely obese, Very severely obese
- working without external library (such jQuery) - pure html+CSS+JS (about 6 kB of code)
Please look demo page and check if it meets your expectations
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I created mortgage calculator for client and he also using WIX so i know that to insert calculator must be in one file (html included javascrit and CSS) - and I can do that.
I need help with the translation into Dutch :)