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Mag World is an effort to develop an intuitive sense of scale-–not just “bigger” or “smaller”, but how much bigger, and how much smaller. And what are each of the levels of scale like?

To develop fluency, we use a simplified notation for numbers that focuses on the magnitude. We apply this notation broadly to get a perspective on life and the universe and everything.

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We’ve been working on a podcast!

Update Feb 2026: According to Spotify we’ve got ↑1 listeners now! Thanks to everyone for spreading the message!

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Now you can install a browser plugin that lets you convert numbers and units on webpages into Mag World numbers and units. Pin it to your toolbar, and when you click the “magify” button, “10 million kWh” becomes “↑13.6 joules” (hover for original text).

Install for Firefox Install for Chrome