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SEO Return on Ad Spend Calculator

The SEO Return on Ad Spend Calculator expresses organic-search value as a multiple of SEO spending. Although ROAS is most common in paid media, teams sometimes use an ROAS-style ratio to compare the revenue associated with SEO against the direct cost of the program.

This calculator keeps that comparison simple: attributed organic revenue is divided by SEO spend. It does not subtract cost, so it should not be labeled ROI. Use the ratio for channel comparisons only when the attribution window, revenue definition, and cost scope are consistent.

Calculator inputs

USD
USD
%
Result
—
revenue returned per $1 spent
Revenue ROAS—
Gross profit attributed—
Gross-profit ROAS—

1. Enter attributed organic revenue

Use revenue credited to organic search under your reporting model.

2. Enter SEO spend

Use direct program spending for the same period and scope.

3. Add gross margin

Enter the percentage of revenue remaining after direct cost of goods or service delivery.

4. Review both ratios

Revenue ROAS supports top-line comparison; gross-profit ROAS better reflects unit economics.

5. Keep definitions consistent

Do not compare ratios built from different attribution windows or cost scopes.

Revenue ROAS = Attributed organic revenue ÷ SEO spend
Attributed gross profit = Attributed organic revenue × Gross margin
Gross-profit ROAS = Attributed gross profit ÷ SEO spend

A 4.0× revenue ROAS means four dollars of attributed revenue for every dollar of SEO spend. It does not mean a 400% profit or ROI because spend has not been subtracted and other costs may remain.

What the result means

The main result shows attributed organic revenue per dollar of SEO spend.

Use gross-profit ROAS when product or fulfillment costs are significant.

Given

  • $420,000 attributed organic revenue
  • $70,000 SEO spend
  • 55% gross margin

Calculation

Revenue ROAS = $420,000 ÷ $70,000 = 6.00×. Attributed gross profit = $420,000 × 0.55 = $231,000. Gross-profit ROAS = $231,000 ÷ $70,000 = 3.30×.

Result

Revenue ROAS = 6.00×; gross-profit ROAS = 3.30×.

Interpretation

Each dollar of SEO spend is associated with six dollars of revenue and $3.30 of gross profit under the entered attribution assumptions.

Is SEO ROAS a standard accounting metric?

No. It is an analytical ratio adapted from advertising. Define it clearly whenever you report it.

Why show gross-profit ROAS?

Revenue can overstate economic value when margins are low. Gross-profit ROAS incorporates the entered margin.

Does ROAS include SEO spend in the numerator?

No. The numerator is attributed revenue or gross profit; spend is the denominator.

Can I compare this with paid search ROAS?

Only when revenue attribution, reporting period, and included costs are aligned across channels.

What is the difference between 6× ROAS and 500% ROI?

A 6× ROAS means revenue is six times spend. If revenue were the only value and spend the only cost, ROI would be (6 − 1) × 100 = 500%.