terraform/website/docs/configuration/functions/tonumber.html.md

layout	page_title	sidebar_current	description
language	tonumber - Functions - Configuration Language	docs-funcs-conversion-tonumber	The tonumber function converts a value to a number.

tonumber Function

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

tonumber converts its argument to a number value.

Explicit type conversions are rarely necessary in Terraform because it will convert types automatically where required. Use the explicit type conversion functions only to normalize types returned in module outputs.

Only numbers and strings containing decimal representations of numbers can be converted to number. All other values will produce an error.

Examples

> tonumber(1)
1
> tonumber("1")
1
> tonumber("no")
Error: Invalid function argument

Invalid value for "v" parameter: cannot convert "no" to number: string must be
a decimal representation of a number.