Estimate Website ROI, Payback and Incremental Profit
Model a new website, redesign, SEO program, lead-generation site or ecommerce improvement using traffic, conversion rate, order value, gross margin, lead value, recurring costs, implementation ramp, NPV and payback.
Project and business model
Traffic and conversion
Financial assumptions
Website investment result
| Month | Ramp | Incremental sessions | Incremental conversions | Incremental gross profit | Monthly cost | Net benefit | Cumulative net |
|---|
Website ROI calculation
Website ROI equals net incremental benefit divided by total website investment. The model first estimates how traffic and conversion-rate improvements change conversions, then converts those conversions to gross profit or lead value, applies attribution, and subtracts project, maintenance, campaign and staff costs.
Payback and NPV
Payback is the first month cumulative net benefit becomes non-negative. NPV discounts future monthly net benefits using the entered annual rate. A project can have positive undiscounted ROI but lower or negative NPV if benefits arrive slowly.
Redesign, SEO and ecommerce modes
The project type changes the funnel visual and recommended interpretation, while revenue model controls how conversions become economic value. This avoids assuming every website earns money through online orders.
Should revenue or gross profit be used?
For ecommerce, gross profit is more defensible because product cost is excluded. Lead and subscription models use entered economic values that should reflect contribution, not merely headline revenue.
What does attribution percentage mean?
It is the share of modeled improvement reasonably credited to the website project after considering other causes.
Can the calculator predict Google rankings?
No. It models financial outcomes from entered traffic and conversion changes; it does not forecast search-engine decisions.