What a low-converting website really costs

Key takeaways

A low-converting website costs a business the enquiries it should have won from traffic it already pays for. The loss is rarely visible on a bill, which is why it runs for years. On typical UK SME numbers, the gap between 1% and 2.5% conversion is worth more each year than the cost of fixing it several times over.

• £15,000 a month in lost sales is possible from a 1.5-point conversion gap on 2,000 visits.
• Paid traffic to a low-converting page multiplies cost per enquiry.
• SEO and social spend lose value when the landing page cannot convert.
• The fix usually costs £500 to £3,000, less than one month of the loss.

Why is the cost of a low-converting website hidden?

The cost is hidden because it is made of things that did not happen: enquiries not sent, calls not made, baskets abandoned. A broken van shows up on a repair bill. A website quietly turning away 30 buyers a month shows up nowhere unless you measure conversion and compare it with what similar sites achieve.

• The difference between a good website and a high-converting website

How do you calculate what a low-converting website costs?

Multiply monthly visits by the gap between your conversion rate and a realistic target, then by your enquiry-to-sale rate and average sale value. The result is the monthly revenue the website is leaving behind.

• Monthly visits: 2,000.
• Current conversion rate: 1% (20 enquiries).
• Realistic target: 2.5% (50 enquiries).
• Enquiry-to-sale rate: 25%.
• Average sale: £2,000.
• Lost revenue: 30 extra enquiries x 25% x £2,000 = £15,000 a month.

• Work out what a website enquiry is worth
• What a 1% conversion lift is worth to your business

What does low conversion do to your ad spend?

Low conversion multiplies your cost per enquiry. If you pay £2 a click and 1% of clicks enquire, each enquiry costs £200. At 2.5% the same clicks cost £80 per enquiry. The ad platform, targeting and budget are unchanged. The landing page is the difference.

This is why agencies that only manage ads can struggle to improve results for SMEs. The expensive part of the problem often sits on the website.

• Cost per enquiry: what your website leads really cost
• Landing page structure for enquiries

What other costs does a low-converting website create?

Beyond lost revenue, a low-converting site wastes the investment in every channel that sends visitors to it, and it produces misleading data that leads to bad decisions, such as cutting a channel that was working.

• SEO spend earns rankings that do not turn into enquiries.
• Social media sends visitors who leave without acting.
• Sales time is spent on poorly matched enquiries when pages do not qualify buyers.
• Owners conclude 'marketing does not work' and cut budgets that were never the problem.

• Social media lead generation for UK small businesses

What does it cost to fix?

Indicative UK market ranges are £500 to £3,000 for focused conversion work on existing pages, £3,000 to £12,000 for a redesign of structure and templates, and £5,000 to £20,000 or more for a rebuild. In the worked example above, even the rebuild costs less than two months of lost revenue.

Start with the cheapest fixes. Tracking, headlines, proof, price guidance and form changes usually recover most of the gap.

• What conversion improvement work costs in the UK

When is the calculation misleading?

The calculation overstates the loss if your target rate is unrealistic for your sector, if extra enquiries would be poor quality, or if the business could not handle more work. It understates it when the site also loses repeat customers or referrals who check the site before calling. Use conservative inputs and treat the result as a range, not a promise.

• Website conversion rate benchmarks for UK businesses

What does this look like in practice?

A UK home care provider was spending around £1,500 a month on search ads to a homepage that converted about 0.9% of visits. Cost per enquiry was high enough that the owners were ready to stop advertising. We built three focused landing pages with fees guidance, CQC rating, local carer stories and a callback form.

Cost per enquiry roughly halved in the following quarter on the same budget. The ads had never been the main problem.

• See client work
• Website Design & Development for UK businesses

Cost of low conversion checklist

• Record monthly visits, enquiries, enquiry-to-sale rate and average sale value.
• Set a realistic target rate for your sector.
• Calculate the monthly revenue gap.
• Calculate cost per enquiry for each paid channel.
• Compare the gap with the cost of the cheapest fixes.
• Re-run the numbers every quarter.

Next step

Once you see the monthly cost of a low-converting website in pounds, the decision about fixing it usually makes itself. We will help you run the numbers honestly, including when the answer is that the website is not the problem.