Method and assumptions
Use metrics from the same campaign, attribution window and reporting period. Mixing platform-attributed conversions with another revenue source makes the ratios misleading.
CTR = clicks / impressions. CPC = spend / clicks. CPM = spend / impressions × 1,000. CPA = spend / conversions.
Common questions
Can I compare campaigns from different attribution windows?
Not reliably. Standardize the attribution window before comparing efficiency.
Why is platform ROAS different from store ROAS?
Attribution rules, view-through conversions, time zones and refund treatment can differ.
Independent calculator. Not affiliated with or endorsed by the platforms mentioned.