Math

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ceil
The ceil filter rounds a variable up to the next highest integer value. This is useful when you need to ensure a number is always rounded up to the nearest whole number, regardless of its decimal portion. The filter requires no additional parameters.
def
Returns a given default value for a variable in case the variable is not defined or empty.
floor
The floor filter rounds a variable down to the next lowest integer value. This is useful when you need to ensure a number is always rounded down to the nearest whole number, regardless of its decimal portion. The filter requires no additional parameters beyond the variable being processed.
round
Returns a rounded value of a variable as integer. This function doesn't expect any parameters.
Custom Filters
Automad already provides a set of filters to modify the value of a variable. However, in some cases it may be necessary to use a custom function to process the content of a variable. Custom filters are written in plain PHP and their setup is very similar to the structure of a generic extension.