That would depend on many factors, of course: you would need to consider the creatives, audience, bidding – just to name a few. We normally suggest having at least $2 to $5 per variation. No need to start big, an initial setup could be 2 Images + 2 Ad Texts + 2 Genders. This will create 8 ads, and with your $20 budget, you’ll be able to see reliable results and fine-tune your ads.
While your choice of split tests really depends on the kind of business you’re advertising and your available budget, you can choose from a wide array of options such as Country, Gender, Placement, Interests, Age, Custom Audiences, Purchase Behaviors, Education Level.
Check how much your next Facebook campaign will cost in this article from our blog!