ROMS-Tools is a Python package designed for creating the input files necessary to run a UCLA-ROMS simulation, with or without MARBL biogeochemistry. The package simplifies the process of generating grid, tidal forcing, surface forcing, initial conditions, boundary forcing, river forcing, carbon dioxide removal (CDR) forcing, and nesting. In addition to input generation, ROMS-Tools includes utilities for postprocessing and analysis, particularly for CDR monitoring, reporting, and verification (MRV).