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Make your money work for you.

Original finance and investment research and tools since 2009. Trusted by professionals at firms like Goldman Sachs, NASA JPL, and J.P. Morgan.

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Since DQYDJ was founded in 2009, we've published thousands of posts and built hundreds of tools.

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Everything from finance to economics to investing to hardware design.

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Calculators and visualizations on everything from income to net worth to taxes.

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Obscure data sets and deep dives into topics to help you decide the right course of action.

About Us


Infomation and background on DQYDJ, from its start during the Great Recession until today.

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Want a guided tour? The following posts are some of our most visited.
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Income Percentile Calculator for the United States in 2018

See individual pre-tax income compared to the distribution for all workers’ incomes in the United States.

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S&P 500 Return Calculator, with Dividend Reinvestment

Calculate the total return on the S&P 500 between two dates including reinvested dividends and inflation.

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Net Worth Percentile Calculator for the United States

Calculates a net worth’s percentile as compared to the United States household wealth distribution.

How Many Millionaires Are There in America?

See our estimate for the number of millionaires in America, as well as decamillionaires and more.

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Income Percentile by Age Calculator for the United States in 2018

Compare a pre-tax income earned to distribution for others of the same age in the United States.

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Who Are the One Percent in the United States by Income and Net Worth?

Examination of the top one percent in America, both by income as well as by accumulated net worth.

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