This calculator tells you how much money you should have invested at a certain age to retire by your target age. It’s a simple way to get a ballpark estimate based on the 4% rule. As always, do your research and this is all just for informational purposes. No tool is comprehensive but I am proud of you for taking the time to think about the future and good luck on your FIRE journey! I am a professional marketer who loves all things SEO and writing… feel free to contact me if there is any way that I can be of help.