onclick clear
No-Library (pure JS), HTML, CSS, JavaScript
the large list of google suggestions through jquery
http://www.javascriptsource.com/math-related/body-mass-index.html
from https://www.enginethemes.com/
http://www.bankrate.com/calculators/investing/annuity-calculator.aspx
http://www.moneychimp.com/calculator/annuity_calculator.htm