Unit systems

There are many unit systems, and Natural Calculator can work with them.

As mentioned above, there are only nine built-in units. They refer to the metric system (this system is built-in). The metric system is set in the program as the default one. Its main units are the basis for other units and unit systems.

In the previous chapter, we explained the declaration of user-defined units. All those examples refer to the metric system. To declare a unit of another system, you must type its name exactly in the lower index during unit declaring ([Shift]-[3]).

Example:

The following example illustrates how to declare the units of the U.S. system.

As we can see, the system name is entered exactly during declaration. Whereas, in later use, exact name entering can be dropped (if there is no system declared with the same name):

The result also refers to the U.S. (current) system.

Unit names in different systems can be the same. In this case, a clear indication is necessary.

Example:

The "ft" unit exists both in the English and U.S. systems. This is how it is declared in the example:

In later use, it can be unclear, without reference to the current system, which unit exactly is meant:

It is possible:

It is useful to put all the necessary units into a file that you can include the document at any time.

Example: