planetcalc.com

https://planetcalc.com· First analyzed 05 May 2026· Updated 05 May 2026

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planetcalc.com

Mobile

Sponsored

Hosting Provider

HOSTKEY

IP Address

139.60.161.59

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 New York, United States

ASN

AS395839

Organization

HOSTKEY

Server

Apache

Nameservers

ns1.hostmonster.com.ns2.hostmonster.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

470 ms10%

Speed Index

611 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

523 KB

208 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

HOSTKEY

Technology Stack

8 Technologies Detected

Icon Libraries

Font Awesome Material Icons

Libraries

CSS Frameworks

Fonts

Advertising

Web Servers

Languages

SEO Analysis

D57/100

Meta Tags4/15

Content11/12

Headings8/8

Technical15/25

E-E-A-T0/7

Images4/7

Links3/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

planetcalc.complanetcalc.com

Online calculators

No description available for this page.

Title Length18 chars

Recommended: 50-60 chars (~105px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description — important for click-through rates in SERPs

8 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

5 rules

Local SEO

Local Search Readiness

8/100

Poor

3 14 1

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

Sponsored

AI & LLM Readiness

F36/100

Bot Access

20/25

Machine Read.

9/25

Schema Data

0/25

Citation

7/25

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

Text ratio:11%

Words:777

Token eff.:Optimal

Sections/1K:7.7

Structured Data

1 JSON-LD

Citation Readiness

Opening Summary

Descriptive Headingsavg 2.5w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (11)

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.

71/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

13/20

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

Forms & Inputs

15/15

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

2/15

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

ARIA & Roles

6/15

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

1 recommendation

•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.

50/100

65 mg

CO₂e / view

523.1 KB

Page Weight

80%

Cleaner Than

New Visitor

74 mg

Returning (cached)

37 mg

Annual (10K/mo)

7.8 kg

Emission Segments

Data Center

14 mg

Network

16 mg

Device

35 mg

Resource Breakdown

JavaScript

338.6 KB

Images

52.7 KB

CSS

17.4 KB

Fonts

7.8 KB

HTML

7.2 KB

Other

99.3 KB

Green Hosting Not Verified

HOSTKEY

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

86%Very Good

Static / Informational

HTTPS

No WAF

79d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

24.04.2026

Valid Until

23.07.2026

Subject Alternative Names (10)

de.planetcalc.comembed.planetcalc.comes.planetcalc.comfr.planetcalc.complanetcalc.compt.planetcalc.comwww.es.planetcalc.comwww.fr.planetcalc.com+2 more

SHA-256 Fingerprint

07:35:2B:9D:94:C9:5C:C9:2E:2A:F2:B2:F2:34:CC:A0:CE:C4:71:F3...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate, max-age=0, post-check=0...)

content-encoding

📦 Gzip(gzip)

content-length

7120

content-type

text/html; charset=UTF-8

date

Tue, 05 May 2026 02:34:05 GMT

expires

Thu, 07 May 2026 02:34:05 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

mail.planetcalc.com

Domain Information

planetcalc.com

Domain Age

18y 5m

Created

27.11.2007

Expires

27.11.2026

Last Updated

10.05.2023

Registrar

Bluehost Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Quantcast Choice

Cookie Consent Banner

Quantcast Choice

GDPR Indicators

Cookie consent banner detected

CMP: Quantcast Choice

Data Protection Officer mentioned

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.

65/100

Mobile Friendly3 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=1.0

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Roboto

WCAG AAA

71/100

Readability

/30

20/30

16px · LH --

Hierarchy

/20

17/20

3.75x ratio · ✓ H1→H6

WCAG

/25

21/25

13.16:1 min contrast

Performance

/25

13/25

1 font · 2 req

Heading Font

Roboto

Sans60px

Body Font

Roboto

Sans16px

Contrast Ratio

13.16:1

WCAG AAA (≥7:1)

Reading Comfort

Single Font Family

left aligned

60px

20px

34px

24px

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

❌ Very complex text: Flesch score 24/100. Consider shorter sentences and simpler words.

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 13.2:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

✅ Strong hierarchy: Headlines are 3.8x larger than body text.

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

GGoogle FontsFlesch 24

Color Palette

7 unique colors

5.46:1 AA Light

#ffffff

Text· 72.1%

#6e6868

Other· 2.6%

#273238

Primary· 9.799999999999997%

#cfc4bc

Secondary· 4.5%

#e8e5e2

Secondary· 4.2%

#1d1e25

Secondary· 2.1%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

16 Resources

Scripts

Styles

Async

Defer

Top Script Sources

securepubads.g.doubleclick.net(3)cmp.inmobi.com(2)cdn.fuseplatform.net(2)btloader.com(1)c.amazon-adsystem.com(1)

Website Identity

Planetcalc

MathSolver

18 years old

Location detected: 🇺🇸 United Statesvia ip

Bluehost Inc.en

Social Profiles

X (Twitter)

Sponsored

Last analyzed: 05 May 2026 at 02:34

Historical Analysis & Change Tracking