(16)Investment product calculators are already being developed at national level. However, in order that the calculators are as useful as possible to consumers, they should cover the costs and fees charged by the various PRIIP manufacturers, together with any further costs or fees charged by intermediaries or other parts of the investment chain not already included by the PRIIP manufacturers. The Commission should report on whether those tools are available on-line in each Member State and whether they provide for reliable and accurate computations of aggregate costs and fees for all products within the scope of this Regulation.