New in version 1.15.0: The round filter was added in Twig 1.15.0.
The round filter rounds a number to a given precision:
{{ 42.55|round }}
{# outputs 43 #}
{{ 42.55|round(1, 'floor') }}
{# outputs 42.5 #}
The round filter takes two optional arguments; the first one specifies the precision (default is 0) and the second the rounding method (default is common):
Note
The // operator is equivalent to |round(0, 'floor').