The number of custom modules equals the number of installed modules minus the number of core modules (303 for EE edition and 226 for CE edition). Here are 3 ways to find the number of installed modules: Method 1: Use admin panel Login to admin panel Go to System > Tool > Web Setup Wizard Click to Module Manager and you will see the number of installed modules. See example. Method 2: Use SSH Log in your server via SSH Run this command: php bin/magento module:status The list of installed modules will appear. See example. Method 3: Use SFTP Log into your server via SFTP Open file: app/etc/config.php The list of installed modules will appear. See example.