This application works as a linear  interpolations calculator. It allows the use of a table when the exact value you look for it is omitted in this table through an interpolation between two known values.

You can also make an extrapolation if the table does not go far enough.

This is a very frequent problem when you have to use statistic tables, so the application is designed to be easy to manipulate with a mobile phone or a tablet.

The example in the initial screen is removed from the table of expectancy life the population in the area of Social Security, as shown in the link