What is Social Media Ad ROI Calculator?
Marketing math should not require a spreadsheet every time someone asks “was Meta worth it this month?” Return on ad spend (ROAS) and return on investment (ROI) are the basic lenses—one is a ratio people quote in meetings, the other translates into percent gain or loss on dollars risked. Cost per conversion adds another lens when your funnel is volume-based.
This calculator keeps the definitions visible so you do not mix up numerator and denominator when you are in a hurry.
How It Works
Plug in total spend for the period, revenue you are willing to attribute to that spend, and optionally conversions if you want a back-of-envelope CPA. We compute ROAS as revenue over spend, ROI as profit over spend in percent terms, and CPA as spend divided by conversions when you gave a conversion count.
Formula
ROAS = Revenue ÷ Ad spend ROI % = ((Revenue − Ad spend) ÷ Ad spend) × 100 CPA = Ad spend ÷ Conversions (if conversions > 0)
Formula Explained
These formulas assume revenue and spend line up to the same time window and attribution story. If your business has long sales cycles, your marketing team may track blended models instead—still useful as a starting point.
Example
Spend $5,000; attributed revenue $18,500; 142 purchases. ROAS ≈ 3.7×, ROI ≈ 270% on spend, CPA ≈ $35.21 per purchase—then ask whether margin supports that CPA.
Tips & Best Practices
- ✓Separate brand vs. prospecting when you can—they behave differently.
- ✓Watch incrementality tests when someone demands “prove it.”
Common Use Cases
- •Monthly paid social retros for lean teams
- •Agency slide decks that need clean definitions