You can use the COUNTIF function in Google Sheets to find the number of items in a range that meet certain criteria. You can use text, numbers, and dates as criteria in the COUNTIF function. COUNTIF ...
SharePains by Pieter Veenstra on MSN

CountRows, CountIf, CountA and Count in Power Apps

How often would you like to count the number of records without really wanting to load all the records that exist in a list ...