opentf/website/docs/configuration/functions/log.html.md

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functions	log - Functions - Configuration Language	docs-funcs-numeric-log	The log function returns the logarithm of a given number in a given base.

log Function

-> Note: This page is about Terraform 0.12 and later. For Terraform 0.11 and earlier, see 0.11 Configuration Language: Interpolation Syntax.

log returns the logarithm of a given number in a given base.

log(number, base)

Examples

> log(50, 10)
1.6989700043360185
> log(16, 2)
4

log and ceil can be used together to find the minimum number of binary digits required to represent a given number of distinct values:

> ceil(log(15, 2))
4
> ceil(log(16, 2))
4
> ceil(log(17, 2))
5