Website ROI Calculator
Enter your monthly traffic and average lead value. See how much revenue a well-converting website could be generating compared to what you're getting now.
Average revenue per sale, booking, or enquiry.
Why conversion rate matters more than traffic
Most UK businesses focus on getting more visitors. More traffic, more ad spend, more SEO effort. But if your site isn't converting those visitors into enquiries or sales, traffic is just a vanity number. A site with 1,000 visitors converting at 4% generates four times more revenue than the same traffic at 1%. Improving your conversion rate grows your revenue without spending a penny more on advertising. That's why website conversion rate is one of the most impactful things you can work on.
What's a realistic benchmark for UK small businesses?
The average small business website in the UK converts somewhere between 1% and 3% of visitors. That sounds fine until you realise that a well-built site, properly structured for its audience, typically hits 3–5%. The 4.5% benchmark used in this calculator sits in that realistic range for a site that's been built with conversion in mind. It's not wishful thinking. It's what businesses consistently achieve when their site actually does its job. If you're sitting below 2%, there's almost certainly revenue being left on the table every single month.
A website that exists vs one that converts
There's a real difference between having a website and having one that works. A site that exists ticks the box. It answers "do you have a website?" and that's about it. A site that converts is built around what a visitor needs to feel confident enough to get in touch or buy. That means clear messaging, a well-structured page, fast load times, trust signals where they matter, and an obvious next step. Most websites UK businesses are running were built cheaply, haven't been updated in years, or were put together to win the pitch rather than to actually perform. This website ROI calculator helps you put a real number on what that gap is costing you.
The hidden cost of a bad website
Most businesses don't think of a poor website as an ongoing expense. They think of it as a one-off cost they've already absorbed. But a site converting at 1% instead of 4% isn't a sunk cost. It's a recurring one. Every month, visitors land on your site and leave without getting in touch. Every month, your competitors with better sites pick up the enquiries you didn't. The cost isn't the original build price. It's the revenue gap, adding up month after month. For many UK businesses, that figure runs into tens of thousands of pounds a year.