CasingSizes.com is a free online engineering reference tool designed to give petroleum and drilling engineers instant access to API 5CT casing specifications — without hunting through PDF tables or waiting on software licences.

Our Mission

Drilling and well engineering decisions happen fast, often in remote locations with limited connectivity. CasingSizes.com puts verified, standard-compliant casing data in front of engineers in seconds — on any device, anywhere.

We believe that core engineering data should be freely accessible. The API 5CT casing standard is the foundation of every well design globally, and every engineer should be able to look up collapse pressure, internal yield, and joint strength without a paywall.

Disclaimer

All data on CasingSizes.com is for reference and preliminary engineering only. Values represent nominal minimums from API 5CT. Always apply appropriate design factors and verify with current API publications and manufacturer mill certificates before field application.

Last updated: January 2025

No Personal Data Collection

CasingSizes.com does not require registration and does not collect personally identifiable information during normal use of the calculator. The tool runs entirely in your browser — no data you enter (OD, weight, grade) is transmitted to our servers.

Contact Form

If you voluntarily submit the contact form, your name, email address, and message are transmitted to Netlify Forms solely to allow us to respond to your enquiry. This data is not sold or shared with third parties and is retained for up to 12 months.

Google Analytics

We use Google Analytics to collect anonymised usage data (page views, session duration, general geographic region). This data does not identify individual users. Google Analytics uses cookies; you may opt out by installing the Google Analytics Opt-out Browser Add-on.

Google AdSense & Advertising

This website may display advertisements served by Google AdSense. Google uses cookies to serve ads based on your prior visits to this and other websites. You may opt out of personalised advertising by visiting google.com/settings/ads.

Cookies

We use cookies required for site functionality and, where consent is given, advertising cookies for Google AdSense. No personally identifiable information is stored in cookies by CasingSizes.com.

Children's Privacy

CasingSizes.com is a professional engineering reference tool intended for adults. We do not knowingly collect data from children under 13.

Changes

We may update this policy periodically. Changes will be posted on this page with an updated revision date.

Contact

For privacy enquiries, use the Contact form on this site.

Questions, data corrections, or feature requests — fill in the form below and we'll respond within 2 business days.

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