Which metric would you use to evaluate how effectively ad spend translates into revenue?

• A. CTR
• B. CPA
• C. ROAS
• D. CPC

Answer: (C)

Measuring how ad spend translates into revenue is about efficiency of media spend. Return on Ad Spend (ROAS) expresses how much revenue you earn for every dollar spent on advertising. It’s calculated by dividing the revenue generated from paid campaigns by the ad spend. This makes ROAS the best choice for judging whether your advertising dollars are actually driving the revenue you expect, and you can compare campaigns, channels, or time periods to optimize where you invest.

Other metrics don’t directly tie spend to revenue. CTR shows how often people click an ad but not what that traffic yields in revenue. CPC tells you cost per click, not revenue. CPA measures cost to acquire a customer, but it doesn’t reveal total revenue unless you translate that into value per acquisition and scale, which still doesn’t directly reflect revenue relative to spend.

For example, spending $1,000 and generating $4,000 in revenue yields a ROAS of 4x (or 400%). Keep in mind ROAS focuses on revenue efficiency and doesn’t subtract other costs, so you’d still consider margins for full profitability.