---
slug: /en/sql-reference/aggregate-functions/reference/stddevpop
sidebar_position: 30
---

# stddevPop

The result is equal to the square root of [varPop](../../../sql-reference/aggregate-functions/reference/varpop.md).

:::note    
This function uses a numerically unstable algorithm. If you need [numerical stability](https://en.wikipedia.org/wiki/Numerical_stability) in calculations, use the `stddevPopStable` function. It works slower but provides a lower computational error.
:::