Matrix Field Count Records Is there an easy way to return the total number of entries in a Super Table within a Matrix field?
You mean how many rows the table has?

{{ matrixblock.superTableFieldHandle|length }}


Or the number of blocks of a matrix field?

{{ parent.matrixFieldHandle|length }}


To get the number of blocks for each row

{% for row in entry.superTableMatrix %}
    {{ row.matrix|length %}
{% endfor %}