calculator.com

https://calculator.com· First analyzed 17 May 2026· Updated 17 May 2026

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calculator.com

Mobile

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.21.64.122

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

sara.ns.cloudflare.com.clark.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

388 ms10%

Speed Index

504 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

194 KB

61 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Technology Stack

9 Technologies Detected

CSS Frameworks

Bootstrapv4.3.1

Tailwind CSS

Advertising

Google Ads Google AdSense

Libraries

Icon Libraries

Fonts

CDN

Languages

SEO Analysis

D55/100

Meta Tags9/15

Content9/12

Headings3/8

Technical15/25

E-E-A-T3/7

Images1/7

Links3/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

calculator.comcalculator.com

calculator.com®

calculate anything, anytime, anywhere... Free online calculators for everything. Some solve problems, some satisfy curiosity and some simply for fun.

Title Length15 chars

Recommended: 50-60 chars (~89px / 580px)

Description Length149 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (4/4) — critical for accessibility and SEO

11 issues found

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Crawlability

Sitemap

robots.txt

5 rules

Sitemap reference found

Allows all crawlers

Local SEO

Local Search Readiness

6/100

Poor

2 13 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

D41/100

Bot Access

20/25

Machine Read.

8/25

Schema Data

0/25

Citation

13/25

AI Bot Access

14/14 accessible

AI Search

OAI-SearchBot

PerplexityBot

Claude-SearchBot

Gemini-Deep-Research

DuckAssistBot

Training

GPTBot

ClaudeBot

Google-Extended

Meta-ExternalAgent

Bytespiderinfo

Amazonbot

Applebot-Extended

CCBotinfo

Fetch

ChatGPT-User

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

nav

Text ratio:1%

Words:748

Token eff.:Optimal

Sections/1K:2.7

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary26w

Descriptive Headingsavg 2w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (10)

AI readiness recommendation preview...

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Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.

47/100

Passed

Critical

Warnings

Images & Alt Text

5/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

9/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

10/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

15/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

3/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

5/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

5 recommendations

•Accessibility recommendation preview...

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Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.

55/100

A+

20 mg

CO₂e / view

194.0 KB

Page Weight

95%

Cleaner Than

New Visitor

22 mg

Returning (cached)

11 mg

Annual (10K/mo)

2.4 kg

Emission Segments

Data Center

1 mg

Network

6 mg

Device

13 mg

Resource Breakdown

JavaScript

76.8 KB

HTML

12.7 KB

Other

104.4 KB

Green Hosting Verified

Cloudflare

GWF Verified

5 recommendations

•Carbon footprint recommendation preview...

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Security Score

26%Critical

Interactive

HTTPS

WAF

78d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

05.05.2026

Valid Until

03.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

calculator.com*.calculator.com

SHA-256 Fingerprint

8A:CD:FC:2E:8B:E7:BA:ED:AA:40:BD:64:99:51:99:BA:86:1B:06:DB...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=86400

cf-cache-status

DYNAMIC

cf-ray🇺🇸 Washington DC

9fcf6cd509482978-IAD

content-encoding

zstd

content-type

text/html; charset=UTF-8

date

Sun, 17 May 2026 03:09:45 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

mail.calculator.com

Domain Information

calculator.com

Domain Age

30y 4m

Created

24.01.1996

Expires

25.01.2027

Last Updated

26.01.2025

Registrar

GoDaddy.com, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Quantcast Choice

Cookie Consent Banner

Quantcast Choice

GDPR Indicators

Cookie consent banner detected

CMP: Quantcast Choice

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.

62/100

Mobile Friendly2 breakpoints

Viewport Meta

The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.

Responsive Design

Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.

Touch Icons

Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.

Readable Font Size

Base font size should be at least 16px on mobile to ensure text is readable without zooming.

Relative Units

Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.

No H-Scroll Risk

No elements wider than the viewport that would cause horizontal scrolling on mobile devices.

Tap Targets OK

Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.

No Fixed Widths

No elements with fixed pixel widths that could overflow on smaller screens and break the layout.

Viewport

width=device-width, initial-scale=1

3 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Times New Roman

WCAG AAA

64/100

Readability

/30

22/30

16px · LH 2.00

Hierarchy

/20

5/20

WCAG

/25

24/25

8.41:1 min contrast

Performance

/25

13/25

1 font · 2 req

Heading Font

Times New Roman

Serif

Body Font

Times New Roman

Serif16px

Contrast Ratio

8.41:1

WCAG AAA (≥7:1)

Reading Comfort

~43 CPL

Narrow lines

29px

22px

16px

✅ Excellent readability: 16px body text is ideal for all devices.

⚠️ Wide line spacing (2.00). 1.4–1.6 is optimal for body text.

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 8.4:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

⚠️ Text justify detected: Justified text creates uneven word spacing, hurting readability on web.

✅ Lean font stack: 1 font families keeps load times fast.

GGoogle Fonts Buy on MyFontsFlesch 61

Color Palette

5 unique colors

2.69:1 Fail Light

#ffffff

Background· 57.20000000000001%

#9f9da0

Other· 0.5%

Business & Marketing Stack

2 Tools Detected

Advanced

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

29 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(7)fundingchoicesmessages.google.com(4)pagead2.googlesyndication.com(3)gstatic.com(1)cdn.jsdelivr.net(1)

Website Identity

calculator.com

30 years old

Location detected: 🇨🇦 Canadavia ip

GoDaddy.com, LLCen

Sponsored

Last analyzed: 17 May 2026 at 03:10

Historical Analysis & Change Tracking