Website Revenue Loss Calculator
Find out how much revenue a slow, outdated or hard-to-use website may be costing your business. Three short steps, an instant estimate and a health score. No signup to see your results.
How website speed affects sales
Visitors decide quickly whether a site is worth waiting for. Each extra second of loading gives them time to hit back and try a competitor, and the effect is strongest on phones with patchy connections.
Google measures this with Core Web Vitals. A Largest Contentful Paint (when the main content appears) of 2.5 seconds or less counts as good; over 4 seconds counts as poor. Large images, heavy scripts and slow hosting are the usual causes.
Why mobile experience matters
For most businesses, the majority of visits now come from phones. A site that only works well on a desktop makes those visitors pinch, zoom and hunt for buttons.
Good mobile experience means readable text without zooming, tap targets large enough for a thumb, short forms that work with autofill, and checkout or contact steps that don't fight the keyboard.
Signs your website needs a redesign
It's slow on mobile, hard to update without a developer, or still describes services you no longer lead with.
Enquiries or sales have flattened while traffic hasn't, visitors can't find the next step, or the design looks dated next to competitors. If several of these apply, a focused redesign usually pays back faster than more advertising.
How we calculate
Revenue from your website today
E-commerce: visitors × conversion rate × order value
Leads: visitors × conversion rate × close rate × deal value
What fixing the issues could add
Each issue you report (slow load time, weak mobile experience, an old design, unclear calls to action) adds a typical conversion uplift. The total is capped at 60%, and the difference between current and potential revenue is the estimated loss. Figures are estimates based on typical industry patterns, not guarantees.
Frequently asked questions
Planning a redesign? Get a free, itemised quote or read how much a business website costs in 2026.