An appellate court in Missouri will only reverse a judgment that awards breach of contract damages if there are no facts in that present a “rational basis for a rational estimate of damages.” Gilham v. LaRue Constr., 136 S.W.3d 852, 856 (Mo. Ct. App. 2004).
Typically, the objective in awarding contract damages is to put the non-breaching party in as good a position as he or she would have been in if the contract had been performed. The onus and responsibility to prove the existence and nature of the damages is on the plaintiff or party claiming the breach.