Free tool

SEO ROI Calculator: Estimate the Revenue Value of Organic Growth

Seed Light built this free SEO ROI calculator so you can weigh your monthly search spend against the customers it brings, using a first year ramp you choose instead of instant results.

Pick how fast you expect search work to ramp, and see the payback that ramp gives you.

Your search spend, and what it brings

What do you pay for SEO each month

Your agency fee, or what your own time costs you.

How many extra visitors a month once it is working

The steady figure you expect after a year, not next month.

Out of every 100 visitors, how many get in touch

Search traffic often does better than average here.

Out of every 100 people who get in touch, how many buy

Your close rate.

What does a customer spend with you on average

One order or one job.

How fast do you expect it to ramp

A modelling assumption, not a forecast. 1 is conservative, 2 is moderate, 3 is faster. Each one sets how much of your full traffic figure lands in each month of year one.

Out of every 100 you take, how much is gross profit

What is left after the cost of doing the work.

Your result

Enter your numbers and your result will appear here. The calculation runs in your browser.

Talk through your result

Book a free 15-minute call and we will help you read the numbers and decide what is worth improving first.

We record the result band you reach, not the numbers you enter.

Free to use, with no sign up. The calculation runs in your browser, so the values you enter are not sent to our server or stored.

The maths

How this calculator works

01
You pick the ramp, and it is an assumption
Moderate holds the first three months at nothing, then a quarter, then sixty percent, then full speed. Conservative starts later and climbs slower. Faster starts in month three. None of the three is a rule about how search behaves.
02
The ramp decides how much of year one you get
Add the twelve monthly factors together and moderate delivers what 5.55 full months would, conservative 3 and faster 7. Whichever you pick, the first year is worth less than a flat twelve month sum would claim.
03
Traffic becomes gross profit
Each month's visitors run through your contact rate, your close rate and your average sale, then your margin. Profit is what pays a fee, so revenue on its own is left out of the verdict.
04
Break even is found month by month
The tool adds up profit and fees as the months pass and names the first month where profit catches up. If it never does inside a year, it says so instead of rounding it away.

A worked example

A firm expects 800 extra visits a month once search is working, turns 2.5 in a hundred into leads and closes three in ten, and picks the moderate ramp. Example only. Replace these assumptions with your own numbers.

Extra visits a month, at full speed: 800
Leads a month, at full speed: 20
Customers a month, at full speed: 6
Months one to three, on moderate: Nothing, the work is still landing
Months four to nine, on moderate: A quarter, then sixty percent
Year one total, on moderate: 5.55 full months, so 33.3 customers
The same year on conservative: 3 full months, so 18 customers
The same year on faster: 7 full months, so 42 customers

See how we do SEO

Straight answers

Common questions

Common questions about the calculation and how to use the result.

No, there is no fixed period for SEO work to show clearly. Existing pages or technical fixes may move sooner, while competitive new content can take longer.

Use the most defensible forecast you have: existing Search Console performance, current rankings, relevant query demand and a conservative estimate of achievable clicks.

SEO fees are recovered from profit rather than sales. The calculator uses gross profit so the return reflects what remains after the work is delivered.

No. The SEO ROI calculator models the period shown in its inputs and does not add a second year automatically. To review another year, enter a separate traffic forecast and the costs expected during that period instead of assuming the first-year pattern continues.

Yes, but ads usually show results sooner. Search takes longer to build and can keep bringing visits after active work slows, so compare each over a suitable period.

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