Win7 & Win8 Calculator in more detail

Windows 7 calculator looks just like Vista's version, but explore the Mode menu and you'll see powerful new Statistics and Programmer views. And if you're clueless about bitwise manipulation, then try the Options menu instead. This offers many different unit conversions (length, weight, volume and more), date calculations (how many days between two dates?), and spreadsheet-type templates to help you calculate vehicle mileage, mortgage rates and more.

Programmer Binary, Hex Values, Bytes

 

Scientific Calculator

Calculate, Angle, Area, Energy, Length, Pressure Temperature, Time, Velocity, Volume, Weight/Mass 

 Calculate Stats

Calculate Dates

Calculate Mortgages, Leases, Fuel Economy