Bad UX costs revenue — quietly and continuously. It leaks conversions (53% of mobile users abandon a page that takes over three seconds to load; around 70% of carts are abandoned), erodes trust (75% of users judge credibility on design), and drives up internal costs through support tickets and rework. And fixing a usability problem after launch can cost up to 100× more than catching it in design — so poor UX compounds the longer it ships.
Here’s the data on what poor design actually loses you, grouped by where the money goes — and how to find what it’s costing your product.
Lost conversions and revenue
The most direct cost of bad UX is the users who leave before they convert.
Source: Google
- A 1-second delay in page response can reduce conversions by around 7%. — Akamai
- The average online shopping-cart abandonment rate is about 70%, much of it caused by confusing or high-friction checkouts. — Baymard Institute
- A better UX design could raise conversion rates by up to 400% — which is the flip side: poor UX is leaving that on the table. — Forrester Research
Lost trust and credibility
Bad UX doesn’t just lose the sale today — it costs you the visitor’s trust, often in the first second.
Source: Stanford Web Credibility Research
- 38% of people will stop engaging with a website if the content or layout is unattractive. — Adobe
- Users often decide whether to stay or leave within the first 10–20 seconds — bad UX rarely survives that window. — Nielsen Norman Group
The hidden costs: support, rework and churn
The costs that never appear on a marketing dashboard are often the largest. Confusing flows generate support tickets. Unclear onboarding drives churn before users reach value. And every issue that ships gets more expensive to fix.
Source: IBM Systems Sciences Institute
The accessibility cost
Inaccessible UX excludes real customers and, increasingly, carries legal risk. Over 1 billion people live with some form of disability (World Health Organization), yet 96% of the top one million homepages had detectable accessibility failures (WebAIM Million). Since June 2025 the European Accessibility Act has made accessible UX a legal requirement for many products sold in the EU — so bad accessibility is now a compliance cost as well as a market one.
How to find what bad UX is costing you
Start where the money leaks: drop-off in your conversion funnel, cart or form abandonment, page-load and Core Web Vitals, support tickets clustered around specific flows, and churn right after onboarding. A UX audit ties those symptoms to specific design issues and ranks them by impact, so you can put a rough number on what each problem costs and fix the expensive ones first — the positive case for which is laid out in our UX ROI statistics. When you’re ready to act, the fixes usually flow into conversion rate optimization — and our conversion rate benchmarks show where you currently stand.
Frequently asked questions
What does bad UX actually cost?
Bad UX costs revenue directly and indirectly: lost conversions (53% of mobile users abandon a page that takes over three seconds to load, and the average cart-abandonment rate is around 70%), lost trust (75% of users judge credibility on design), and higher internal costs from support tickets and rework. Fixing a usability problem after launch can cost up to 100 times more than catching it in design, so poor UX compounds the longer it ships.
How much revenue does poor UX lose?
It varies by business, but the mechanisms are consistent and large. A one-second delay in page response can cut conversions by around 7% (Akamai); 53% of mobile visits are abandoned after a three-second load (Google); and roughly 70% of online carts are abandoned, much of it to checkout friction (Baymard). On meaningful traffic, each of these is a direct, recurring revenue leak that good UX recovers.
Is bad UX more expensive than good design?
Almost always, because bad UX costs quietly and continuously while good design is a one-time investment that pays back. Beyond lost conversions, poor UX generates support tickets, drives churn, and creates rework — and fixing an issue after development can cost up to 100 times more than fixing it in design. The cheapest time to fix bad UX is before it ships; the most expensive is never.
How do you measure the cost of bad UX?
Start where the money leaks: drop-off in your conversion funnel, cart or form abandonment rates, page-load and Core Web Vitals, support tickets clustered around specific flows, and churn after onboarding. A UX audit ties those symptoms to specific design issues and ranks them by impact, so you can put a rough number on what each problem costs and fix the expensive ones first.