A financial patent valuation is only as good as the estima- tions behind it. For start-up companies and young entrepre- neurs in particular, patents usually play a major role in finding possible investors to finance the future commercialisation of the innovative product covered by the patent. At the same time, investors need to economically valuate the potential of the patent by using an easily and quickly adaptable method, in order to make the right decisions for their investments. The new valuation method presented here is specially customised for patents in start-up companies or for patents owned by en- trepreneurs; it provides an easy calculation method combined with a qualitative valuation method, to be applied both to the patent itself and to its future commercialisation in possible markets. In four steps (combined with provided templates), the patents can be financially valuated, with comparatively little effort and low costs.