Is it legal to use information from online calculators in the ad or website for a smartphone app?

Is the following approach legal? A website created for a smartphone app that is under development includes the following two parts: 1.) A claim that a donation of 5$ can provide up to 5 people with access to save water for one year. This fact is taken from another website that offers a free online calculator for donation effectiveness; 2.) An overview how the app would allocate investments to different financial products. The allocation of funds is equivalent to a general recommendation by an online service that tailors investment portfolios to a desired risk-return profile. More specifically, the allocation of funds is again taken from a form of online calculator. The website is hosted in Germany, but targets consumers across the US.