calculator.io
Calculator.io — Online Calculators for Fitness, Science, Math, Finance, Health
Last scanned Jul 26, 2026, 4:17 PM
Overall score
Great
Summary
Find the calculator you need with our extensive collection of free online calculators! We've got you covered from finance to math, health to physics. This website uses Cloudflare Analytics behind Cloudflare CDN. SEO is good (80/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.
Find the calculator you need with our extensive collection of free online calculators! We've got you covered from finance to math, health to physics. Try it now!
Top issues to fix
9 issues found · 2 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Title longer than 60 characters
SEOShorten the title to under 60 characters so search results don't truncate it.
Meta description longer than 160 characters
SEOTrim the meta description to under 160 characters to avoid truncation in search results.
+3 more issues — details in the sections below.
SEO
4 issue(s) found
Performance
17 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
Find the calculator you need with our extensive collection of free online calculators! We've got you covered from finance to math, health to physics. Try it now!
Meta tags
- Title
- Calculator.io — Online Calculators for Fitness, Science, Math, Finance, Health
- Description
- Find the calculator you need with our extensive collection of free online calculators! We've got you covered from finance to math, health to physics. Try it now!
- Canonical
- https://www.calculator.io/
- Language
- en
- Charset
- UTF-8
- Viewport
- width=device-width, initial-scale=1.0, minimum-scale=1.0
- Robots meta
- index, follow
- Manifest
- https://www.calculator.io/site.webmanifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- —
- CDN provider
- Cloudflare
- IP address
- —
- ASN
- —
DNS records
| Type | Value |
|---|---|
| A | — |
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Google Trust Services
- Subject
- calculator.io
- Valid from
- Jul 20, 2026
- Valid to
- Oct 18, 2026
- Days until expiry
- 81
- SAN domains
- calculator.io, www.calculator.io, *.www.calculator.io
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 1 · H3 0
Links
69 internal · 0 external · 20 broken
Images
0 total · 0 missing alt
Scripts / Styles
11 scripts · 2 stylesheets
JS / CSS size
0 B · 87 B
Page size
43.3 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Title longer than 60 characters
- Meta description longer than 160 characters
- robots.txt not found
- sitemap.xml not found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://calculator.io
- Final URL
- https://www.calculator.io/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 17 ms
- HTML size
- 43.3 KB
- Redirect chain
- https://calculator.io → https://www.calculator.io/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does calculator.io use?
- calculator.io is built with Cloudflare Analytics, Google Ads.
- Is calculator.io secure (HTTPS)?
- Yes. calculator.io uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Oct 18, 2026.
- Who hosts calculator.io?
- Hosting provider information for calculator.io is not available yet.
- What is calculator.io's SEO score?
- calculator.io scored 80/100 for SEO in the latest analysis (great).
- What is calculator.io's overall website score?
- calculator.io has an overall SiteGraph score of 85/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card