How to Calculate PPC ROI
A PPC ROI calculation asks whether the gross profit attributed to paid clicks exceeds the cost of acquiring that traffic. It complements ROAS by accounting for the margin required to deliver the product or service.
Use one reporting scope
Match spend, clicks, conversions and revenue to the same account, campaign set, dates and attribution window. A conversion total from one window paired with spend from another creates a distorted return.
Value conversions realistically
For ecommerce, use attributable revenue per order. For lead generation, multiply close rate by average realized deal revenue to estimate value per lead. Avoid assigning every form submission the value of a completed sale.
Interpret ROI and ROAS together
ROAS shows revenue efficiency, while ROI shows the return after gross margin and ad spend. A campaign can have a positive-looking ROAS and still lose money when gross margin is low.
Use break-even CPC as a guardrail
Break-even CPC indicates the most you can pay per click at the entered conversion rate, value and margin before media profit reaches zero. It is a planning threshold, not an automatic bid recommendation, because performance changes by query, audience and position.