Marketing ROAS Calculation: Merge Google Ads Data Locally Without Sharing It
6/13/2026
The ROAS Calculation Problem
Return on Ad Spend requires combining your advertising platform data — clicks, spend, impressions — with your conversion data — actual revenue or leads generated.
Most tools handle this by having you connect your Google Ads and Analytics accounts, which means your advertising performance data lives in third-party platforms. Your competitor data, your best-performing keywords, your highest-converting audiences — all of it sits in tools you do not control.
What ROAS Calculation Actually Needs
ROAS is spend divided by revenue. The calculation itself is simple. The complexity is in assembling the data:
| Data Source | Fields Needed | Privacy Risk |
|---|---|---|
| Google Ads export | Campaign, ad group, keyword, clicks, cost | Competitive intelligence |
| Conversion export | Tracking ID, revenue, order date | Sales data |
| CRM data (optional) | Customer lifetime value | Internal strategy |
The Merge Step: Where Most Tools Create Risk
The matching step — which clicks converted into which orders — requires matching on the tracking ID or UTM parameters. This is where most tools require cloud processing.
Local ROAS Workflow in DataOlllo
DataOlllo handles the full pipeline locally:
- Export your Google Ads performance CSV — DataOlllo opens files with millions of click records
- Export your order or conversion CSV with the tracking ID
- Merge the two files on the tracking ID
- Calculate ROAS per campaign, ad group, or keyword
| Campaign Type | Spend | Revenue | ROAS | Verdict |
|---|---|---|---|---|
| Brand Search | $2,400 | $18,200 | 7.6x | Profitable |
| Competitor Targeting | $890 | $3,100 | 3.5x | Profitable |
| Broad Match Generic | $4,100 | $2,800 | 0.7x | Loss |
| Retargeting | $1,600 | $9,400 | 5.9x | Profitable |
The Competitive Privacy Advantage
Your Google Ads data reveals which keywords drive the most valuable traffic, which campaigns compete on price, and which audiences convert at the highest rates. Processing this locally means your competitive intelligence stays private.
DataOlllo is available for both Windows and macOS.
Getting Started
Download DataOlllo and try merging your Google Ads export with your conversion data. Calculate ROAS by campaign and see which ones actually drive profitable revenue. DataOlllo is free for personal use.