Calc98 is a calculator that can be used instead of that comes with Windows, because it is very comprehensive and has many more features, among which the following stand out:
Lets make conversions between different units, has all kinds of scientific functions which support different units of measure; supports financial functions and statistics , you can work with times, angles, periodic table of elements , Roman numerals, arrays, character format ASCII, physical constants, complex numbers, etc.; Disponde a countdown timer, has a panel with 10 memories, among other features.
As seen is much more than a calculator, very useful not only for mathematics, but also for other subjects such as physics and chemistry.
The latest version is 5.3 which includes new features such as a tool for computing with IP addresses. It is available for Windows and is free .
Calc98 5.3 Download