Nest Egg Calculator: How Much Will I Have at Age X?

Supply Chen Management

So we’ve all heard that “if you save and invest ‘X dollars’ every year starting at ‘age Y’ you’ll be a millionaire”.  How much will your retirement nest egg amount to at age 50? 60? 70?  Find out in seconds through this predictive simulation calculator!


  1. Click “Run Pen” to activate the interactive Pen
  2. Once activated, enter your current age, starting balance, and yearly contribution
  3. Click “Simulate Again” for a new simulation

The assumptions are as follows:

  • Rate of Return is calculated via =norm.dist(RAND(),mean,std dev) function to help simulate variability
  • Annual return ranges based off normal distribution with a mean of 1.07 (7% annual gain) and .13 standard deviation (95% (+/- 2std dev) of all years will be between -19% and +33%)
  • In today’s dollars, 7% real return as n approaches infinity
  • n = 50 simulations
  • Percentiles will create a decent inner-quartile range

If you notice errors or have any questions…

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