Website ROI Calculator
Estimate the revenue uplift, 12-month ROI and payback period of improving your website using your own traffic, conversion, margin and investment assumptions.
Your current numbers
Gross margin is the percentage of revenue left after the direct cost of delivering the product or service. Use your own figure where possible.
Improvement scenario
Set your own assumptions. These are scenario inputs, not guaranteed results.
Monthly enquiries
20
Monthly customers
5
Your website ROI scenario
12-month ROI
273%
Estimated payback
3.2 mo
ROI and payback use your gross-margin input, so they estimate return from additional gross profit rather than treating all revenue as profit.
Based entirely on the inputs and uplift assumptions you select. This is a planning scenario, not a forecast, quote or guarantee.
How the website ROI calculator works
The calculator separates revenue uplift from return on investment. It uses your traffic, conversion rates and customer value to model revenue, then applies your gross margin and website investment to estimate payback and 12-month ROI.
Current revenue is calculated as: monthly visitors × visitor-to-enquiry rate ÷ 100 = monthly enquiries. Then: monthly enquiries × enquiry-to-customer rate ÷ 100 = monthly customers. Finally: monthly customers × average customer value = current monthly revenue.
Scenario revenue applies the two uplift assumptions you choose in the calculator. If your current visitor-to-enquiry rate is 2% and you add 1 percentage point, the scenario rate becomes 3%. If your enquiry-to-customer rate is 25% and you add 2 points, the scenario rate becomes 27%. Both assumptions are editable.
Potential revenue uplift is the difference between scenario revenue and current revenue. Annual uplift is simply the monthly difference multiplied by 12.
ROI is calculated from estimated additional gross profit, not total revenue: (annual additional gross profit − website investment) ÷ website investment × 100. Gross profit uplift is estimated by applying the gross-margin percentage you enter to the revenue uplift.
Payback period is website investment ÷ estimated monthly additional gross profit. A lower number means the scenario recovers the investment sooner.
This is a scenario calculator, not a forecast. Actual performance depends on traffic quality, offer, industry, website experience, pricing, competition, sales follow-up and many other factors. Use real analytics, CRM and margin figures wherever possible.
What is not included: the model does not account for seasonality, repeat purchases, customer lifetime value, advertising spend, tax, refunds or changes in traffic volume. It is designed to isolate the commercial effect of the conversion changes you choose.
Worked website ROI example
Using the example values shown when the calculator opens: 1,000 monthly visitors, a 2% visitor-to-enquiry rate, a 25% enquiry-to-customer rate and a £500 average customer value produce £2,500 of estimated monthly website revenue.
If you test a scenario where the visitor-to-enquiry rate increases by 1 percentage point and the enquiry-to-customer rate by 2 points, estimated monthly revenue becomes £4,050. That is a £1,550 monthly revenue uplift. At a 50% gross margin, the estimated additional gross profit is £775 per month.
Against a £2,495 website investment, that example gives an estimated payback period of about 3.2 months and a 12-month ROI of about 273%. Those figures are produced solely from the example inputs; they are not a forecast of what a website redesign will achieve.
What numbers should you use?
Monthly visitors: use your analytics data for a representative period rather than your best-ever month.
Visitor-to-enquiry rate: divide website-generated calls, forms, bookings or other qualified enquiries by website visitors.
Enquiry-to-customer rate: divide customers won from website enquiries by the number of website enquiries received.
Average customer value: use the average revenue from one new customer or job. If repeat business matters, keep this as first-order value unless you deliberately want to model lifetime value.
Website investment: include the project cost you want to test. If you are comparing quotes, run the calculator more than once with each investment figure.
Gross margin: use the percentage of revenue left after the direct cost of delivering the product or service. Ask your accountant or use your management accounts if you are unsure.
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