Skip to content
Seed Lighthome

Free tool

Website ROI Calculator: Estimate What Better Performance Is Worth

Seed Light built this free website ROI calculator so you can enter your own build cost. It shows how many months of extra gross profit a better converting website needs to pay for itself.

Enter a quoted build cost and see how many months of extra gross profit would cover it.

Your website, before and after

A rough number is fine. Google Analytics has it if you use it.

A call, a form, a WhatsApp message. Two is normal.

Be careful here. One extra point is a real result.

Your close rate. An estimate from your own records is fine.

One order or one job.

The margin left after the direct cost of delivering the product or service.

Put in the actual quote you were given. We do not fill this in for you.

Your result

Enter your numbers and your result will appear here. The calculation runs in your browser.

Talk through your result

Book a free 15-minute call and we will help you read the numbers and decide what is worth improving first.

We record the result band you reach, not the numbers you enter.

Free to use, with no sign up. The calculation runs in your browser, so the values you enter are not sent to our server or stored.

The maths

How this calculator works

  1. 01

    Two versions of the same month

    Your visitors are held still. The tool runs them through your current contact rate, then through the rate you expect after the rebuild, and takes the difference.

  2. 02

    Extra leads become extra sales

    Those extra leads are multiplied by your close rate. The rebuild only changes how many people get in touch, so your sales process is left exactly as it is.

  3. 03

    Extra sales become gross profit

    Each extra sale is worth your average customer spend, then your gross margin is applied. What is left is the extra gross profit a month, which is the money a build can be paid back from.

  4. 04

    The cost is divided by that

    Your build cost divided by the extra gross profit each month is the payback in months. If the rebuild adds nothing, the tool says so rather than inventing a number.

A worked example

A clinic gets 1,500 visits a month, turns two in a hundred into calls, and closes three in ten. The rebuild is expected to reach three in a hundred, and 40 in every 100 of sales is gross profit. All money is shown in units so the shape stays clear. Example only. Replace these assumptions with your own numbers.

Visitors a month
1,500
Get in touch today
2 in 100, so 30 leads
Get in touch after
3 in 100, so 45 leads
Extra leads a month
15
Extra sales a month
4.5, at a 30 in 100 close rate
Extra revenue a month
9,000 units, at 2,000 units a sale
Extra gross profit a month
3,600 units, at a 40 in 100 gross margin
Build cost of 36,000 units
Paid back in 10 months
See how we build websites

Straight answers

Common questions

Common questions about the calculation and how to use the result.

There is no dependable lift without your current data and the proposed changes. Model a conservative range, then compare it with the result after launch.

Because it is the one figure nobody else can supply. Each project is scoped differently, and a number we suggested would be a made up price for a job we have not looked at.

Use gross profit because the website cost must be recovered from the value left after fulfilling the additional sales. Revenue includes costs the business must still pay, so using revenue alone can make the projected return look stronger than it is.

Include hosting and upkeep if you want the full return over several years. Leave them out only when you are comparing the build cost with its initial payback.

A rebuild alone will take a long time to pay back when your traffic is very low. The tool shows that result honestly, giving you a figure you can use when reviewing whether the current level of traffic supports a rebuild.

Yes, a new website can keep producing enquiries after its build cost is recovered. Its value depends on useful traffic, sound upkeep and a clear route to contact you.

Let’s talk

Ready to get more
customers?

Tell us what you want to grow or improve. We’ll reply within one working day with honest advice, even if we do not work together.

Prefer email or a call? hello@seed-light.com · +60 16-411 9138

Results so far

Results from real clients

100+

Brands worked with

28,441+

Leads generated

$4.1M+

Sales generated for clients

Up to 13x

Return on Meta ad spend

Tallied from client ad accounts and store reports.

Monthly leads

We reply in one working day