How large should my Lookalike source audience be?

Aim for 1,000-50,000 high-quality source users (purchasers, high-LTV customers). Smaller seeds work but produce noisier lookalikes. Refresh the source every 30-60 days.

Go deeper

Want the full playbook? Read Beginner’s Playbook for Google Ads Audiences — Keywords matter, but they’re only part of the picture. This guide explains the 8 main Google Ads audience types, when to use them, and how to launch them without cluttering your account.