There are numerous tools available for helping with financial decisions. There are is a great community at Bogelheads [0] that you can learn lots from. Given that you are asking about RRSP, I'll guess that you are in Canada, Financial Wisdom and finiki are specific to Canada.

Finiki doesn't have a very long list of Canadian calculators [3]. The US has quite a few [4].

[0] https://bogelheads.org

[1] https://www.financialwisdomforum.org/

[2] https://www.finiki.org/wiki/Main_Page

[3] https://www.finiki.org/wiki/Canadian_retirement_software_%26...

[4] https://www.bogleheads.org/wiki/Retirement_calculators_and_s...