Mobile Usability Checker Calculator

Calculator inputs

This page uses a single stacked layout, while the calculator form adapts to three columns on large screens, two on smaller screens, and one on mobile.

Pages tested

Used to estimate audit confidence.

Monthly mobile sessions

Needed for opportunity estimates.

Mobile conversion rate (%)

Enter your current mobile conversion rate.

Average conversion value ($)

Use average order value or lead value.

Viewport meta tag present

Checks for responsive width scaling support.

Responsive breakpoints tested

Count device widths or layout states reviewed.

Content fit within viewport (%)

Higher values mean less horizontal scrolling.

Base font size (px)

16px is a strong baseline target.

Body line height

Comfort often improves between 1.4 and 1.8.

Average tap target size (px)

44px or larger is safer for touch.

Largest Contentful Paint (seconds)

Lower is better. Aim for 2.5 seconds or less.

Interaction to Next Paint (ms)

Aim for 200ms or less.

Cumulative Layout Shift

Lower is better. Aim for 0.10 or less.

Total page weight (MB)

Includes scripts, styles, and media on first load.

Image optimization coverage (%)

Estimate how many images use proper compression and sizing.

Form usability score (%)

Score labels, spacing, field count, and keyboard matching.

Intrusive interstitial present

Blocking popups can hurt mobile experience.

Blocking mobile issues

Count severe issues such as clipped content or unusable controls.

Reset

Example data table

Sample inputs below produce an example overall score of 91.0 with a Excellent status.

Pages Tested	Mobile Sessions	Conversion Rate	Avg Value	Viewport	Breakpoints	Content Fit	Font	Line Height	Tap Target	LCP	INP	CLS	Weight	Image Opt.	Form Score	Interstitial	Issues
12	25,000	2.80%	$65.00	Yes	4	92.0%	16.0px	1.50	46.0px	2.90s	240ms	0.12	2.40MB	78.0%	82.0%	No	2

Formula used

1) Category formulas
Technical Setup = Average of viewport score and responsive breakpoint score.
Content Fit = Entered content fit percentage.
Readability = Average of font score and line height score.
Touch Targets = Tap target score from average touch size.
Speed = Average of LCP score, INP score, and page weight score.
Layout Stability = Score from CLS.
Media & Forms = Average of image optimization and form usability scores.
Penalty Control = Average of interstitial score and issue-count score.

2) Overall score formula
Overall Score = (Technical Setup × 0.16) + (Content Fit × 0.12) + (Readability × 0.10) + (Touch Targets × 0.10) + (Speed × 0.18) + (Layout Stability × 0.10) + (Media & Forms × 0.12) + (Penalty Control × 0.12)

3) Opportunity estimate
Current Mobile Conversions = Mobile Sessions × Conversion Rate.
Improvement Factor = ((100 − Overall Score) ÷ 100) × 0.35, capped at 35%.
Recoverable Conversions = Current Mobile Conversions × Improvement Factor.
Recoverable Value = Recoverable Conversions × Average Conversion Value.

This checker is a prioritization model. It helps compare mobile usability inputs consistently, but it does not replace a full live audit, crawler, or analytics platform.

How to use this calculator

Gather mobile data from audits, analytics, Lighthouse, Search Console, or manual QA.
Enter page coverage, mobile sessions, conversion rate, and average conversion value.
Fill in layout, text, touch, speed, stability, media, and form inputs.
Choose whether the page has a viewport tag and intrusive interstitial behavior.
Submit the form to generate the usability score, check count, graph, and priority actions.
Use the CSV or PDF export buttons to share findings with developers, SEO teams, or stakeholders.

Frequently asked questions

1) What does this calculator measure?

It estimates mobile usability quality using weighted inputs for responsiveness, readability, touch targets, speed, layout stability, forms, and issue severity. It is designed for prioritization, not direct crawling.

2) Is this a live mobile test tool?

No. You enter the values from audits or measurements you already collected. The calculator turns those inputs into a consistent score and an action-focused summary.

3) What score should I aim for?

A score above 85 is strong. Scores from 70 to 84 are usable but still leave room for improvements. Scores below 70 deserve closer attention.

4) Why do LCP, INP, and CLS matter here?

These metrics describe loading, responsiveness, and layout stability. Poor values often create frustration on smaller screens and can weaken conversions, retention, and perceived quality.

5) Why are touch targets important?

Small buttons and crowded links increase mis-taps. Larger, better-spaced controls reduce frustration and make navigation easier for thumb-based mobile use.

6) Can I use this for ecommerce and lead generation pages?

Yes. The opportunity estimate uses mobile sessions, conversion rate, and average value, so it works for stores, service sites, landing pages, and lead forms.

7) Does a high score guarantee better rankings?

No. Rankings depend on many factors. A high mobile usability score improves experience and can support performance, but it does not guarantee search position changes.

8) How often should I run this checker?

Run it after design changes, template releases, major content updates, or Core Web Vitals regressions. Monthly reviews are also useful for high-traffic pages.