Elon Musk became the world’s first trillionaire on Friday — reaching a wealth milestone never before achieved in human history.

But how much money is $1 trillion? The human brain isn’t built to comprehend such massive figures, so The Post is here to help paint a picture of the Tesla founder’s unimaginable wealth — and put it into context.

If you were to stack one trillion one-dollar bills — each measuring just .0043 inches thick — it would reach more than one-quarter of the distance between the Earth and the moon, or 67,866 miles.

Similarly, if the same stack was laid out end-to-end — each bill with a length of 6.14 inches — it would surpass the distance between the Earth and the sun by nearly 4 million miles.

Another way to help comprehend the mammoth figure — and highlight the difference in size between a million, a billion and a trillion — is comparing them to units of time.

One million seconds ago was June 1, 2026. A billion seconds ago it was Oct. 12, 1994. A trillion seconds ago, for comparison’s sake, was roughly 30,000 BC, during Earth’s most recent ice age.

Now let’s look at the virtually limitless spending power that a trillion dollars really represents.

With a net worth of $1,000,000,000,000, Musk would have more money than the gross domestic product of 197 countries, eclipsed by only 21 of the richest nations on the planet.

If he were so inclined, Musk could also purchase every single franchise in the NFL, MLB, NHL and NBA, and all 10 of the world’s most valuable soccer teams — and still have $392 billion left over.

Musk has held the title of the world’s richest person for years, but now, with a trillion-dollar fortune, his wealth would surpass the combined fortunes of his nearest competitors: Google co-founders Larry Page and Sergey Brin, Amazon founder Jeff Bezos, Meta CEO Mark Zuckerberg, and Oracle co-founder Larry Ellison.

The tech titans, who round out the top five richest people in the world, have a combined net worth of $940 billion, according to Forbes.

If Musk were feeling generous, he could divvy up his fortune to give every single person on Earth $120. The world population is approximately 8.3 billion people.

He could also purchase approximately 2.7 million homes in the US, based on the current average house price of $370,320, according to Zillow’s latest housing market report.

With Friday’s historic initial public offering of Musk’s aerospace company, SpaceX, the Tesla and X CEO has launched himself into the history books, amassing a fortune so large it virtually defies human comprehension.