Our method provides a first step towards quantifying the old adage 'ferromagnetic coupling is the absence of antiferromagnetic coupling' in real-life complexes. We envision that future application studies can focus on interpreting the influence of different active space choices, and evaluate chemical changes such as the nature of the bridge, the influence of ligands trans to the bridge, and even oxidation state changes if double exchange effects are appropriately accounted for in the fitting equations.