ROAS (Return on Ad Spend) is the ratio of ad spend to revenue. Formula: ROAS = revenue from ads ÷ ad spend. If you spend $1,000 and earn $5,000, ROAS = 5x.
ROAS is handy for comparing ad channels: which campaign returns more per dollar. But it isn't the full picture — revenue isn't profit; a high ROAS can still lose money at a low margin.
