Self-consistent energy calculations at different unit cell volumes for NbOF2 and NbO1.5F1.5 with different magnetic configurations (Fig. ) were fitted to a third order Birch-Murnaghan equation of state. These results indicate that a ferromagnetic (FM) ordering of spins is significantly more stable for both compositions by approximately 0.01 eV and 0.06 eV per formula unit, respectively. This contradicts the previous assertion that FM ordering will be lost on the addition of oxygen to NbF3. Many of the calculations show difficult convergence to the desired magnetic state on account of a shallow potential energy landscape and low magnetic moments; only the FM calculation could be reliably converged at all volumes for both compositions.