You can convert Debian DEB packages to RPM packages using alien linux program. Should not be used on system critical packages.
Convert Debian Linux package to Linux package manager archive.
We found 2 software records in the database related to .deb to .rpm file format conversion.
Articles and other information relating to deb into rpm conversion:
How to convert DEB to RPM and RPM to DEB or other packages - Converting Linux packages using alien program
Microsoft Windows software - convert deb to rpm on Windows
Popular open source file archiver with a high compression ratio
Convert from deb file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned deb to rpm. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Linux/Unix software - convert deb to rpm on Linux
A linux packages conversion program