Use ROAS to assess how profitable your ad campaigns are. Each business is different as there are varying degrees of profit margins but a healthy ROAS for most is usually 3+. 

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This means that for every £1 you are spending on ads, you are receiving £3+ back through revenue. If your ROAS is below 1 then your campaigns are spending more than you are making. 

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Add your gross revenue directly attributable to your ads and the gross spend you've spent on that campaign to see what your ROAS is.