Website ROI for Small Business: How to Calculate What Your Site Is Worth

A business website is either making money or losing it. If you cannot calculate which one it is, you cannot make good decisions about it.

Most small business owners never calculate the return on their website. They know it cost something to build. They know it takes some time to maintain. They have a vague sense of whether enquiries are up or down. But they have never put a number on what the site is worth to their business and what it is costing them.

Here is how to do that calculation. It takes ten minutes. And it will tell you whether your current site is an asset or a liability.

The simple ROI formula

Website ROI is calculated the same way as any business investment:

(Revenue from website — Cost of website) ÷ Cost of website × 100 = ROI percentage

If your site cost £4,000 to build and £200 per month to maintain, and it generates £15,000 in revenue per year, your annual ROI is:

(£15,000 — £6,400) ÷ £6,400 × 100 = 134%

The site paid for itself and made a profit within the first year. Every year after that, the build cost is zero so the ROI increases further.

How to calculate revenue from your website

This is where most business owners get stuck. They do not know how much revenue their website generates because they do not track it.

Here is how to estimate it:

Count your website enquiries. How many people contacted you through the website last month? Form submissions. Phone calls from website visitors. Emails to the address listed on the site. Count all of them.

Estimate your conversion rate from enquiry to client. If ten people enquired and two became clients, your conversion rate is twenty percent. Use your actual numbers if you have them. Estimate conservatively if you do not.

Calculate the average value of a client. If you are a plumber and the average job is £350, that is your figure. If you are an accountant and the average annual retainer is £1,200, use that. Be honest. Do not round up.

Multiply. (Monthly enquiries × conversion rate) × average client value = monthly revenue from website.

Example: A builder gets fifteen website enquiries per month. Three become clients. The average project is £8,000.

(15 × 0.20) × £8,000 = £24,000 per month from the website.

If the site cost £5,000 to build and £300 per month to maintain, it paid for itself in the first week of the first month. The annual ROI is not 134%. It is 4,700%.

The hidden costs of a bad website

The formula above calculates what your site is making you. But there is another calculation that is equally important: what your site is losing you.

If your current site converts two percent of visitors into enquiries but a properly designed site would convert five percent, you are losing three percent of your potential revenue every month. That is not theoretical. That is the difference between an average site and a good one.

If your site gets 1,000 visitors per month and the average client is worth £500:

Current: 1,000 × 2% = 20 enquiries → £10,000 potential revenue Potential: 1,000 × 5% = 50 enquiries → £25,000 potential revenue

The bad site is losing you £15,000 per month. Every month you keep it is a £15,000 decision. The cost of a new site — £4,000 to £8,500 — is less than the monthly loss.

What a good website actually delivers

A good website does more than look professional. It changes the economics of your marketing:

It converts more visitors. Better copy, clearer structure, and a frictionless enquiry process can double or triple your conversion rate.

It attracts more visitors. SEO-built sites bring traffic without advertising spend. Every new page that ranks for a commercial keyword is a free source of leads.

It reduces your cost per lead. If you currently pay for Google Ads or social media advertising, a site that ranks organically reduces your dependence on paid channels. Every lead from organic search is a lead you did not pay for.

It improves over time. A site on a maintenance plan gets faster, ranks higher, and converts better month after month. A site left alone degrades. The gap between the two widens continuously.

When to invest in a new website

You should invest in a new website when one of these things is true:

Your current site looks more than five years old. Design expectations change. A site from 2021 looks dated in 2026. Customers judge credibility in seconds. An outdated site costs you trust before they read a word.

Your conversion rate is below three percent. If fewer than three in a hundred visitors become enquiries, the site is underperforming. A properly designed service business site should convert at three to seven percent.

You cannot change things yourself. If you have to email a developer every time you want to update a price or add a page, the friction is costing you opportunities.

Your site is slow. If pages take more than three seconds to load on mobile, you are losing visitors before they see your content. Google is penalising you too.

You cannot answer the question “what is my website worth?” If you cannot calculate the ROI because you have no tracking, no conversion data, and no idea what the site is doing for your business, the site is a cost centre, not an asset. Fix that.

The risk is not investing

The biggest risk is not the cost of the site. It is the revenue you lose by keeping a bad one. A £5,000 website that generates £50,000 in revenue is the best investment you will make this year. A free site that generates nothing is the most expensive thing you own.

LeadBuilt builds sites with ROI built in from day one. Conversion goals are set before development begins. Analytics and event tracking are live at launch. Every page has a clear objective. Every form is designed to convert. The site earns its keep from the first month.

A £295 Website Blueprint gives you a written review of your current site and a fixed-scope proposal — credited against any build commissioned within 30 days. If you want to know what your website is worth and what it could be worth, start there.