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Marketing ROI: what it is, how to calculate it, and where teams get it wrong

ROI, ROMI, and ROAS formulas, simple and precise calculation, margin, attribution, payback, CRM, examples, and SEO vs ads decisions.

Published · 26.04.2026 1 min read

In short

ROI, ROMI, and ROAS formulas, simple and precise calculation, margin, attribution, payback, CRM, examples, and SEO vs ads decisions.

Visual guide

ROI is a decision metric, not a trophy

Measure revenue, cost, margin, attribution limits, and payback before calling a channel profitable.

Revenue88

Cost46

Margin64

ROI shows whether an investment paid off. In marketing, teams often calculate it too simply: they take revenue and forget margin, salaries, agency costs, repeat sales, and attribution limits.

Quick answer

Basic formula: (revenue - costs) / costs × 100%. For marketing, also track ROMI, ROAS, CAC, LTV, and payback.

Metrics

Metric	Formula	When it helps
ROI	profit / cost	overall return
ROMI	marketing profit / marketing cost	marketing efficiency
ROAS	ad revenue / ad spend	ads and e-commerce
CAC	cost / new customers	customer acquisition cost
Payback	cost / monthly profit	time to recover investment

Common mistakes

Counting revenue instead of profit.
Giving the whole sale to the last click.
Ignoring repeat sales.
Comparing SEO and Ads over too short a period.
Ignoring lead quality.
Not connecting CRM and analytics.

For cleaner measurement: check channels with UNmiss, add sem.chat to qualify questions, and connect analytics with SEOquick services.

SEO vs Ads

Ads show demand faster but require ongoing budget. SEO is slower but can reduce dependence on paid channels. Compare not “which is cheaper”, but how each channel affects profit, speed, and durability.