The conversion of numbers in different numerical bases. The software is fully adapted to the needs of students from middle school and upper that they are dealing with numeric conversions calculated using different bases. The program is intuitive and provided of a simple and immediate interface that makes it easy to use from the first approach. The conversion systems are implemented: decimal binary Octal hex UTF-8 (base 256) Roman. The "Roman" is clearly not a basis of numerical calculation, but can be useful when you want to enumerate an order or simply enrich a list. The program is able to perform the automatic conversion of all five systems, Simply complete the field of numerical basis of departure (one of five) to complete all fields simultaneously. There is a real-time monitoring for any compilation errors. Requires no installation and thanks to its small size, can its use on a storage medium is easily transportable as a USB memory stick.