---
title: "Simulation Hypothesis · an interactive thought experiment"
url: https://simulation-hypothesis.com/
description: "Work out how much computing a simulated world like ours would take, and when our computers could run it, using published physics and neuroscience."
license: https://creativecommons.org/licenses/by/4.0/
credit: "Ross Allan Dahl, Simulation Hypothesis (simulation-hypothesis.com)"
---

# What would it take to simulate a world?

How much processing power would a world like ours need, and when could our computers run it? This site works it out from published physics and neuroscience. Every number says how far you can trust it, every date comes as a range, and none of it tells you whether we’re in a simulation. It’s an estimate, not a verdict.

* [How we count it](https://simulation-hypothesis.com/method)
* [Objections, and where this stops](https://simulation-hypothesis.com/objections)
* [Has anyone tested for it?](https://simulation-hypothesis.com/tests)
* [Short on time? Start here](https://simulation-hypothesis.com/guide)