33 lines
864 B
Markdown
33 lines
864 B
Markdown
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---
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layout: "functions"
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page_title: "tonumber - Functions - Configuration Language"
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sidebar_current: "docs-funcs-conversion-tonumber"
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description: |-
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The tonumber function converts a value to a number.
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---
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# `tonumber` Function
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`tonumber` converts its argument to a number value.
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Explicit type conversions are rarely necessary in Terraform because it will
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convert types automatically where required. Use the explicit type conversion
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functions only to normalize types returned in module outputs.
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Only numbers and strings containing decimal representations of numbers can be
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converted to number. All other values will produce an error.
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## Examples
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```
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> tonumber(1)
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1
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> tonumber("1")
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1
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> tonumber("no")
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Error: Invalid function argument
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Invalid value for "v" parameter: cannot convert "no" to number: string must be
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a decimal representation of a number.
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```
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