Organic vs Paid Traffic ROI Calculator
SEO and paid media produce traffic through different cost structures. A useful comparison needs the same time period, complete channel costs and consistent definitions of conversion value.
Enter your estimates or measured averages for each channel. The calculator compares visits, conversions, cost, revenue, profit, ROI and cost per acquisition.
Paid media
These estimates depend on the attribution and value assumptions entered. They do not forecast rankings, media performance or future demand.
Use attributable organic traffic
Do not assign every organic visit to current SEO work. Branded demand, established rankings, offline activity and previous investment may contribute to the total.
Use incremental traffic where you have a credible baseline. If that is unavailable, label the result as an attributed-channel estimate and keep the limitation visible when presenting it.
Account for timing
Paid traffic usually arrives while campaigns spend. SEO investment often precedes part of the measured return, and content can continue attracting visits after the comparison period.
Choose a period long enough to reflect the decision you are evaluating. Run more than one scenario when future organic performance remains uncertain.
Use a meaningful conversion value
Revenue can overstate profitability when fulfilment and product costs are substantial. Contribution margin per conversion provides a stronger basis for budget decisions when reliable margin figures are available.
FAQs
Frequently Asked Questions
How should I estimate organic visits attributable to SEO?
Start with a baseline based on the traffic the site would likely have received without the work. Use the difference between measured or forecast organic visits and that baseline, while documenting major changes such as seasonality, brand campaigns and site migrations.
Why does the calculator use a shared comparison period?
Costs and returns change with time, so comparing one month of paid media with a year of SEO would distort the result. A shared period does not remove timing differences, but it makes the input assumptions easier to inspect.
Should paid management fees count as part of the investment?
Yes. Include agency fees, internal management time and creative costs when they are necessary to generate the paid results. Excluding them makes paid acquisition appear cheaper than it is.
Should SEO content and technical work count as organic cost?
Include costs incurred to produce the attributed result, including strategy, content, technical implementation and relevant tools. Avoid adding general website costs unless the same principle is applied consistently to both channels.
What should I use as conversion value?
Use revenue per conversion for a revenue-return view. Use contribution margin when the goal is to compare the money retained after direct product or fulfilment costs.
Does a higher calculated ROI mean I should move all budget to that channel?
No. Channel capacity, lead quality, cash flow, speed and risk also matter. Paid media can capture immediate demand, while organic search may support discovery and reduce marginal acquisition costs over a longer period.
How should I treat conversions that occur after the first visit?
Use an attribution window and model that match the business buying cycle. Apply the same standard to both channels and state whether the input comes from first-click, last-click or another attribution method.
Does the calculator forecast future performance?
No. It applies arithmetic to the figures entered and does not predict rankings, auction costs, search demand or conversion quality. Use ranges and scenario testing rather than presenting one output as a guaranteed outcome.