Quantity flexibility contracts are a prevalent medium in industrial practice aiming at reducing demand and inventory risks with increased fill rates and higher responsiveness. Meanwhile researchers have proved the advantage of such contracts by simulation models. But it still lacks tangible methods for estimating negotiable costs and also for implementation on operational level. Against this background a software supported tool will be presented closing the gaps in scientific formulation of flexibility oriented contract clauses. Furthermore the tool enables an efficient display of additional costs and gives hints for the parameterisation of ERP-(Enterprise Resource Planning)-systems.