Slow Website Cost Calculator
Find out how much a slow website is costing your business.
Quick start: Every second your site takes to load, you lose customers. Find out how much a slow website is costing you.
Check Google Analytics for your total monthly sessions
Test at PageSpeed Insights and enter the seconds shown
Google recommends under 2.5 seconds. Most fast sites load in 1-2 seconds.
Your current conversion rate. If unsure, use 2%.
Example: If your average order is $180, enter 180
Speed Improvement Impact
Here's what faster page loads could mean for your business.
0%
Est. Bounce Rate Reduction
0%
Est. Conversion Increase
0
Additional Monthly Conversions
$0
Additional Monthly Revenue
Potential Annual Revenue Increase
$0
Research shows: A 1-second delay in page load time can reduce conversions by 7% and page views by 11%.
How Page Speed Affects Revenue
Page speed directly impacts your bottom line. Slower sites lose visitors, reduce conversions, and hurt search rankings. The relationship between speed and revenue is well-documented.
This calculator uses the following research-backed estimate:
Conversion Increase = Seconds Improved x ~7% per second
The research behind it
Multiple studies support the impact of page speed on conversions:
- Portent (2022): The highest ecommerce conversion rates occur on pages that load in 0-2 seconds. Each additional second reduces conversions by approximately 7%.
- Google: As page load time goes from 1 to 3 seconds, the probability of bounce increases by 32%. From 1 to 5 seconds, it increases by 90%.
- Deloitte: A 0.1-second improvement in site speed resulted in retail consumers spending almost 10% more.
Core Web Vitals
Google uses Core Web Vitals as a ranking factor. The three key metrics are Largest Contentful Paint (LCP) for loading speed, Interaction to Next Paint (INP) for responsiveness, and Cumulative Layout Shift (CLS) for visual stability. Improving these metrics helps both your search rankings and user experience.
Quick wins for speed improvement
- Compress images: Use WebP format and proper sizing - often the single biggest improvement
- Enable caching: Browser caching reduces load times for returning visitors
- Minimise JavaScript: Remove unused scripts and defer non-critical code
- Use a CDN: Serve content from servers closer to your visitors
Want to see how better conversions could grow your revenue? Try our CRO Revenue Calculator.
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