Cambridge CADPAC chemical modeller input file
File type: Various data file
The .cadpac file extension identifies an input file used by the Cambridge CADPAC chemical modelling software.
The file contains input data for a chemical modelling calculation.
File type category:
Various data file
Date updated: October 2, 2026
CADPAC stands for The Cambridge Analytic Derivatives Package. It is a quantum-chemistry software suite developed at Cambridge since 1981.
A .cadpac file contains the input data required by CADPAC, such as molecular information and calculation instructions. It is part of the software's calculation workflow rather than a general-purpose chemical structure format.
The format is a legacy CADPAC format, so access to the original software may be limited.
Open the file with the CADPAC software that created it, using it as an input file for a calculation. Because CADPAC is a legacy package, it may not be available for current operating systems. A text editor can open the file for inspection or manual editing, but it cannot run the calculation.
Open the file in CADPAC and use any input, output, or export facilities provided by that software.
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