In Windows 7, several new functions have been added. The calculator can be operated in 4 modes: Standard, Scientific, Programmer & Statistics.
Windows 7 Calculator
Its interface has been divided into three areas.
Plus if you need conversion formulas for angle, area, energy, length, power, pressure, temperature, time, velocity, volume, weight, there is also a unit conversion utility included, for converting values from one unit of measurement to another.
There are even templates for gas mileage, lease estimations, and mortgage estimations.
CalcuTray is a small and very interesting application for those who use Windows Calculator frequently, you may want to check out. RedCrab is a powerful scientific and statistical calculator available for Windows.
You can also Make Windows 7 Calculator work in Vista too. Take a look at the features in the Windows 10 Calculator too.