Coast FIRE calculator 12
https://freeretirementplanningcentral.greyhavendaily.com/posts/how-to-find-the-best-free-retirement-planning-tools-for-your-future
I use the Coast FIRE calculator to figure out how much I need to save now so my investments will grow enough to cover my later years, even if I stop adding new money. It's reassuring to see that hitting a certain savings number lets me step back from intense saving and still be on track for retirement.