xCalculator.com is an online calculator directory website that features hundreds of handy online calculators for math, science, energy, health, fitness, finance, conversions, and more. The site is specifically designed to be simple, easy to navigate, and compatible with all browsers and screen sizes. It is a mobile device friendly site, which means it will work great with mobile devices like iPads, iPhones, smartphones and touch screen tablets. In order for the online calculators work properly, the site does require that users have javascript enabled on their browsers, and ideally viewed with either Firefox or Chrome browsers. Users can submit useful or fun calculators to be listed on xCalculator.com.