Website Redesign ROI Calculator
A redesign is easy to justify with a picture and hard to justify with a number. This works out the number: what your existing traffic would be worth at a better conversion rate, and how long a given budget would take to pay for itself.
What this checks
Uses your own figures: traffic, conversion rate, close rate, and customer value — nothing invented.
Three scenarios: where you are now, half a percentage point better, and your target.
The annual revenue difference is the figure that actually belongs in a budget conversation.
Payback period enter a budget to see how many months it takes to pay it back.
Full working is shown every intermediate number, so the result survives being questioned.
No traffic assumptions: the model never assumes more visitors, only better use of the ones you have.
Lifetime value aware uses what a customer is worth over the relationship, not the first invoice.
Nothing is stored; the calculation runs, and the numbers are yours; nothing is saved unless you ask us to look at it.
Why conversion rate is the cheapest number to move
There are three ways to get more customers from a website: more visitors, a higher conversion rate, or a higher close rate. Only one of those is a one-off cost.
More traffic means paying for advertising every month, or waiting six to twelve months for SEO to compound. A better close rate means changing how your sales process works, which is a people problem. Conversion rate is a property of the website itself — you fix it once and every visitor from then on, however they arrived, is worth more.
That is why the arithmetic on a redesign so often works out. You are not buying more of anything. You are being charged less waste on what you already have.
What counts as a realistic target
There is no universal good conversion rate, and anyone who quotes you one is selling something. It depends enormously on what you sell, how much it costs, and where the traffic came from. Someone arriving from a branded search having already decided to call you converts at a completely different rate to someone who clicked a display ad.
As a rough guide for a service business: under 1% usually means something structural is wrong — no clear call to action, no obvious way to make contact, a form nobody finishes. Between 1% and 3% is normal. Above 3% usually means either a very warm traffic source or a very well-built page, and it is rarely where you start.
Doubling a low rate is a realistic outcome of a rebuild. Doubling an already-good rate usually is not. If you are at 1%, model 2%. If you are at 3%, model 3.5% and be pleased if you beat it.
Where the extra conversions usually come from
In practice, the gap between a 1% site and a 2% site is rarely one clever idea. It is a handful of ordinary things done properly.
- A clear, specific call to action visible without scrolling, on every page that matters.
- A contact form that asks for three things rather than eleven. Every extra field costs completions.
- A phone number that is a tappable link, because a large share of your visitors are on a phone.
- Evidence that other people have paid you and been glad — reviews, case studies, named clients, real numbers.
- A page that loads in under two seconds, because a meaningful share of mobile visitors leave before a slow page finishes.
- Saying what you actually do, in the first sentence, in the words your customers use rather than the words your industry uses.
How to get the numbers to put in
Monthly visitors comes from Google Analytics — use Users rather than Sessions, and take an average of the last three months rather than a good month. If you do not have analytics installed, that is the first thing to fix, because none of this can be measured otherwise.
Conversion rate is enquiries divided by visitors. Count everything that is genuinely an enquiry — form submissions, phone calls you can attribute, emails — and be strict about it. Newsletter signups are not enquiries.
Customer value should be what someone is worth over the whole relationship, not the first job. A business that does one £800 project and then three years of retainer has a customer value far above £800, and using the smaller figure will make every marketing decision look worse than it is.
What this calculator cannot tell you
This is a model, not a forecast. It shows what the money would be if the conversion rate changed. It cannot tell you that it will change, and nobody honest can.
It also assumes everything else holds still — the same traffic, the same mix of sources, the same close rate, the same customer value. In reality a rebuild that improves conversion often improves the quality of enquiries too, which moves the close rate as well. That works in your favour, and it is deliberately not modelled here, because a calculator that stacks optimistic assumptions produces a number nobody believes.
And no redesign fixes a business problem. If the offer is wrong, the price is wrong, or the traffic is the wrong people, a better website converts the wrong visitors slightly more efficiently. That is worth knowing before you spend anything.
Questions people ask
What is a good website conversion rate?
There is no single answer, and be sceptical of anyone who gives you one. It varies by industry, by price point and above all by where the traffic came from. For a service business taking enquiries, somewhere between 1% and 3% is common, under 1% usually points at something structurally wrong, and above 3% is good. Your own rate last quarter is a far more useful benchmark than an industry average.
I do not know my conversion rate. What should I enter?
Divide the number of enquiries you got last month by the number of visitors. If you cannot count either, enter 1% and treat the result as an illustration rather than a figure. Then set up conversion tracking, because you are currently making decisions blind.
Should I use first-sale value or lifetime value?
Lifetime value, if you can estimate it. A customer worth £500 on the first invoice and £4,000 over three years is a £4,000 customer, and using the smaller number will make every investment in marketing look unjustifiable. If you genuinely do not know, use first-sale value and read the result as a floor.
Will more traffic solve this instead?
It can, but it is the expensive route. At a 1% conversion rate you need a hundred visitors for every enquiry, so doubling enquiries means doubling traffic and paying for it every month. Doubling the conversion rate gets the same result from the traffic you already have, and it also doubles the return on any traffic you buy afterwards. Fix the leak before turning up the tap.
How long does a conversion improvement take to show up?
Faster than SEO and slower than you would like. Structural fixes — a clear call to action, a shorter form, a tappable phone number — show up within weeks, because they affect every visitor immediately. But you need enough traffic to tell signal from noise. On a few hundred visitors a month it can take a quarter before the difference is distinguishable from ordinary variation.
Is this calculator free, and do you keep my numbers?
It is free and there is nothing to sign up for. The figures you enter are used to produce the result and nothing more — they are not stored against your name unless you choose to send them to us with an enquiry.
The payback period looks too good. Is it?
Possibly. Check two things: whether the target conversion rate is realistic for your traffic, and whether your customer value figure is an average or a best case. A short payback period on an optimistic target and a best-case customer value is a number that will not survive a finance director. Model the pessimistic version too and see whether it still makes sense.
Think that number is reachable?
We will look at your site and tell you honestly whether that conversion rate is realistic, what would have to change to get there, and what it would cost. If we think the answer is no, we will say so.
