What are Core Web Vitals?

Core Web Vitals are three Google metrics that measure page experience: LCP (Largest Contentful Paint, loading speed), INP (Interaction to Next Paint, responsiveness), and CLS (Cumulative Layout Shift, visual stability). Google uses them as ranking signals and publishes thresholds for Good, Needs Improvement, and Poor.

How much does page speed actually affect revenue?

Google and Deloitte published research showing that a 0.1-second improvement in mobile load time correlates with up to 8-10% conversion rate improvement in retail. Deloitte's 2020 study across 37 retail and travel sites found a 0.1s speed improvement increased conversion rates by 8.4% and average order value by 9.2%.

What is a Good LCP score?

Under 2.5 seconds is Good. Between 2.5 and 4 seconds is Needs Improvement. Above 4 seconds is Poor. Google measures LCP at the 75th percentile of page loads from the Chrome User Experience Report. Tracking this metric alongside conversion data gives a more complete picture of how changes affect actual business outcomes.

How do I improve LCP?

LCP is almost always caused by a large hero image or slow server response. Fixes include: preload the LCP image with a link rel=\\\"preload\\\" tag, serve images in WebP or AVIF format, deliver images via a CDN, and reduce Time to First Byte with edge hosting or caching.

How do I improve CLS?

Set explicit width and height attributes on all images and video elements so the browser reserves space before they load. Avoid inserting content above existing content dynamically. Load web fonts without invisible text flashes using font-display: swap.

Are these revenue projections guaranteed?

No. The projections are estimates based on published industry research coefficients. Actual results depend on your specific audience, device mix, the quality of your speed improvements, and dozens of other conversion factors. Use this tool to set direction, not to forecast revenue precisely.

Core Web Vitals ROI Calculator

The Core Web Vitals ROI Calculator estimates how much additional monthly and annual revenue your site could earn by improving its LCP (Largest Contentful Paint) and CLS (Cumulative Layout Shift) scores. Enter your sessions, conversion rate, order value, and current versus target CWV scores to get a dollar-denominated revenue projection grounded in published Google and Deloitte research.

100% client-side. Site metrics stay in your browser (ons-cwv-roi-inputs).

Estimated revenue impact

$60,000/month ($720,000/year)

Monthly sessionsCurrent conversion rate (%)Average order / lead value ($)Current LCP (seconds)Good under 2.5sTarget LCP (seconds)Current CLSGood under 0.1Target CLS

CWV status

Current LCP

4.5s

Poor

Target LCP

Good

Current CLS

0.25

Needs improvement

Target CLS

0.05

Good

Est. CVR lift

30.0%

LCP 25.0% + CLS 5.0% relative

Monthly revenue lift

$60,000

Annual revenue lift

$720,000

Based on

These projections are estimates. Actual revenue impact depends on your audience, industry, and how you implement the fixes.

How this tool works

The Core Web Vitals ROI calculator estimates the revenue impact of improving your page performance scores. You enter current and target values for LCP (Largest Contentful Paint), INP (Interaction to Next Paint), and CLS (Cumulative Layout Shift), along with monthly organic sessions, conversion rate, and average order value. The tool applies conversion-lift estimates derived from Google's published performance research: roughly 0.1-0.2% CVR improvement per 100ms LCP reduction, with diminishing returns below 2.5s. Ranking uplift from entering Google's 'Good' CWV tier is modeled as an estimated increase in click-through rate based on your current position range. Total revenue impact combines the CVR lift on existing sessions and projected additional organic sessions. Key assumption: CVR lift percentages are industry-average estimates from aggregate studies; actual improvement is site-specific and should be validated with an A/B test or pre/post analysis after implementation. Edge case: CLS improvements tend to have disproportionately large impact on mobile conversion rates but minimal impact on desktop, because layout shifts are more disruptive on small screens. If your traffic is primarily desktop, the calculator's blended estimate may overstate the total uplift from CLS fixes specifically.

Worked example

A retail site with 100,000 monthly sessions, 2.5% CVR, and an $80 AOV improves LCP from 4.5s to 2.0s and CLS from 0.25 to 0.05. LCP improvement drives 25% relative CVR lift, CLS crossing the Good threshold adds 5%, giving a new CVR of 3.25%. That adds 750 conversions per month at $80 each, a monthly revenue lift of $60,000 and $720,000 annually.

Frequently asked questions

What are Core Web Vitals?
Core Web Vitals are three Google metrics that measure page experience: LCP (Largest Contentful Paint, loading speed), INP (Interaction to Next Paint, responsiveness), and CLS (Cumulative Layout Shift, visual stability). Google uses them as ranking signals and publishes thresholds for Good, Needs Improvement, and Poor.
How much does page speed actually affect revenue?
Google and Deloitte published research showing that a 0.1-second improvement in mobile load time correlates with up to 8-10% conversion rate improvement in retail. Deloitte's 2020 study across 37 retail and travel sites found a 0.1s speed improvement increased conversion rates by 8.4% and average order value by 9.2%.
What is a Good LCP score?
Under 2.5 seconds is Good. Between 2.5 and 4 seconds is Needs Improvement. Above 4 seconds is Poor. Google measures LCP at the 75th percentile of page loads from the Chrome User Experience Report. Tracking this metric alongside conversion data gives a more complete picture of how changes affect actual business outcomes.
How do I improve LCP?
LCP is almost always caused by a large hero image or slow server response. Fixes include: preload the LCP image with a link rel=\\\"preload\\\" tag, serve images in WebP or AVIF format, deliver images via a CDN, and reduce Time to First Byte with edge hosting or caching.
How do I improve CLS?
Set explicit width and height attributes on all images and video elements so the browser reserves space before they load. Avoid inserting content above existing content dynamically. Load web fonts without invisible text flashes using font-display: swap.
Are these revenue projections guaranteed?
No. The projections are estimates based on published industry research coefficients. Actual results depend on your specific audience, device mix, the quality of your speed improvements, and dozens of other conversion factors. Use this tool to set direction, not to forecast revenue precisely.