Our clients often want both excel based calculator and web based calculator. Or they send us excel based calculator they already have and ask us to create web based calculator. That is why we have web developers in our team and our specialization in web development is calculators, grids and charts (dashboards). We use php + css + java script to create web calculators. It can be separated web page or we can integrate it into your site (for example with redirection to different locations on the site depends of result of calculation).
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