Logo API

Publications, Standards, and Statistics Overview

Since 1924, The American Petroleum Institute (API) has been the leader in developing equipment and operating standards for the oil and natural gas industry.

Each year API works with leading industry subject-matter experts to maintain our inventory of over 600 standards and recommended practices. API distributes over 300,000 documents annually worldwide, and continues to strive to enhance safety operations, improve quality assurance, and promote the global acceptance of petroleum products and best practices. API standards are designed to assist industry professionals improve the efficiency and cost-effectiveness of their operations, comply with legislative and regulatory requirements, safeguard health, and protect the environment. 

Publications Overview

Search and Order
Search and easily order the API publications you need to get the job done!

Authorized API Redistributors
Contact information for authorized API redistributors to purchase API publications within the US and worldwide.

Publications Catalog
Browse’s API’s catalog of publications, technical standards, and electronic and online products designed to help users improve the efficiency and cost-effectiveness of their operations, comply with legislative and regulatory requirements, and safeguard health, ensure safety, and protect the environment.

All requests to utilize or reproduce API material must be submitted to API either through the online form provided or in writing; no phone requests permitted. (see Permissions Form).

Government-Cited & Safety Documents
Over 160 standards at your fingertips. Access and read API standards online. The purpose of this site is to provide the public with access to key industry standards, particularly those standards that are safety-related or have been incorporated into federal regulation. 

API Engineering Partnership Program
API realizes how important it is to have undergraduate and graduate engineering students understand the practical uses of API standards prior to entering careers in the oil and gas industry. API is now offering the Engineering Partnership to academic institutions worldwide for up to 50% off the complete set of API standards.

Standards Overview

What's New
Click here for a list of recently published API Standards.


Standards Addenda and Errata

Standards Committee Information

API's Standards Committees are made up of subcommittees and task groups of industry experts who develop API standards. 


API Chapter 11.1 C-Code: Temperature and Pressure Volume Correction Factors for Generalized Crude Oils, Refined Products, Special Applications, and Lubricating Oils (Flow-Cal website opens in a new window)

E&P Tanks Software: Production Tank Emissions Model, a software program for estimating emissions from hydrocarbon production tanks (API Pbl 4697).

FAQs and Inquiries

Statistics Overview

Find information on the average price of gasoline at the pump, the countries the U.S. imports of oil and product from, state motor fuel tax rates and information on subscribing to API statistical reports and packages.

API Weekly Statistical Bulletin (WSB)

SANGEA 4.1 GHG Emissions Estimating System
Electronic Greenhouse Gas (GHG) emissions calculator tool for the petroleum and natural gas industry