
In prior posts, I shared some financial math tricks and demonstrated a quick way to calculate your retirement needs. Now I am going to put the two together and use these rules, along with some historical inflation data, to give you a quick estimate of annual income needed for a comfy retirement.

Historical inflation data from InflationData.com
The graph above shows historical inflation rate from 1913 to 2006. Here are some quick factoids:
Using the Rule of 72 and Rule of 115 and inflation rate of 3.4%, we can estimate that:
After reading Chief Family Officer’s comment, I concluded that: A better way to estimate is not to base it off your current income, but off your current estimated annual living expense. The reason is simple, some people make $50,000 a year and could live on $25,000, and some people make over $100,000 but spend more than they earn every year.
Of course, you can apply the 80% rule that said, you only require 80% of your pre-retirement income to live comfortably in your retirement, which will lower your retirement needs by a bit. I will discuss the reasoning behind the 80% rule in a future post.
Carnivals:

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Great article! You really bring home some relevant points in an easy to understand manner. I think I’m a little far off for an accurate estimation of my needs, but this is great for a rule of them estimation.
Thanks for including my link as well.
Thanks Patrick. I guess I am beginning to find my sweet spot. Yeah, this is a very rough estimate, but it does show the impact of inflation on your wealth. Scary.
Thanks for including my post!
I like this rule “current estimated annual living expense” I think it is a lot more accurate and reflective of future retirement financial needs