Author Topic: Shockingly Simple Math  (Read 2045 times)


  • 5 O'Clock Shadow
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Shockingly Simple Math
« on: May 20, 2018, 10:38:38 AM »
Is there a reverse formula out there to the Shockingly Simple Math formula?

If we want to retire in X years I would like it to solve for the amount wed need to save monthly so we know how much more money we would need to make.

For example, we want our portfolio to provide $45k a year ($45k x 25 = $1.125m). Using the same 5% how do we calculate wed need To contribute X in order to retire in 10 years, or maybe wed want to retire in 7 years, how much harder would we have to work?



  • Walrus Stache
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Re: Shockingly Simple Math
« Reply #1 on: May 20, 2018, 11:04:17 AM »
See the 'Misc. calcs' tab in the case study spreadsheet.