gcalctool software package provides GNOME desktop calculator (transitional package), you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gcalctool
gcalctool is installed in your system.
Make ensure the gcalctool package were installed using the commands given below,
$ sudo dpkg-query -l | grep gcalctool *
You will get with gcalctool package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Old Libraries |
| Package | gcalctool |
| Version | 1:3.14.1-1 |
| Description | GNOME desktop calculator (transitional package) |
| Sub Section | oldlibs |