ACS Citation Generator
Generate ACS format citations for chemistry papers. Journal articles, books, and websites formatted to American Chemical Society guidelines with proper abbreviations and styling.
What Is ACS Citation Format?
ACS stands for the American Chemical Society, and the ACS citation style is the standard reference format used in chemistry and related scientific disciplines. If you are writing a lab report, research paper, or thesis in chemistry, biochemistry, materials science, or chemical engineering, your work will likely need to follow ACS guidelines. The style is defined in The ACS Style Guide, which provides comprehensive rules for formatting citations, references, and manuscripts for submission to any of the more than 80 journals published by the American Chemical Society.
ACS format has several distinctive features that set it apart from other citation styles. Journal article citations use abbreviated journal names according to the Chemical Abstracts Service Source Index (CASSI). The year of publication is displayed in bold, and the volume number is italicized, creating a visual hierarchy that makes it easy to scan a reference list. Unlike APA, which places the year immediately after the author name, ACS positions the year after the journal abbreviation. Semicolons are used to separate elements in book citations, and the publisher comes before the city — the reverse of many other styles.
Our free ACS citation generator formats references according to ACS guidelines for journal articles, books, and websites. Enter your source details, and the tool applies the correct punctuation, bold formatting for years, italic formatting for volume numbers and journal abbreviations, and proper element ordering. This saves you from memorizing the intricate formatting rules and reduces the chance of errors in your reference list. For papers in engineering or computer science, try our IEEE Citation Generator for numbered reference formatting instead.
How to Use the ACS Citation Generator
Choose the source type from the dropdown menu: journal article, book, or website. The form will display the appropriate fields for that source type. For journal articles, you will need the abbreviated journal name — ACS uses standard abbreviations from the CASSI database. Common abbreviations include J. Am. Chem. Soc. for the Journal of the American Chemical Society, Angew. Chem., Int. Ed. for Angewandte Chemie International Edition, and J. Org. Chem. for the Journal of Organic Chemistry.
Fill in all available information for your source and click "Generate Citation." The tool formats the output with bold years, italic volumes and journal names, and correct punctuation placement. Use the "Copy Citation" button to transfer the citation to your clipboard. When building your reference list, remember that ACS allows either numbered citations (with superscript numbers in the text) or author-date citations (similar to APA) depending on the journal. Most ACS journals use the numbered style, so check your assignment guidelines or target journal for the expected format.
ACS Format Details and Tips
The ACS citation format has specific rules that can trip up even experienced researchers. For journal articles, the author's last name comes first, followed by initials with periods and no spaces between them. The article title is written in normal (roman) type with only the first word and proper nouns capitalized — sentence case, similar to APA. The abbreviated journal name is italicized, followed by the bold year, italic volume, and page range. If a DOI is available, it should be included at the end of the citation.
Book citations in ACS style use a semicolon to separate the title from the publisher information. The publisher name comes first, followed by a colon and the city of publication, then a comma and the year. This ordering is the opposite of most other citation styles and is a common source of errors. For edited books, the editor names appear after the book title with "Ed." or "Eds." in parentheses. If you need to cite sources for a humanities paper instead, our MLA Citation Generator handles the Works Cited format used in English and literature courses, while our APA Citation Generator covers social science papers.
Journal Abbreviations in ACS Format
One of the trickiest aspects of ACS citations is using the correct journal abbreviation. Unlike APA and MLA, which use full journal names, ACS requires abbreviated forms following the CASSI standard. Each significant word in the journal name is abbreviated according to a set list — for example, "Journal" becomes "J.," "Chemistry" becomes "Chem.," "Proceedings" becomes "Proc.," and "International" becomes "Int." Some journal names are so short that they are not abbreviated at all, like "Nature" and "Science." Always check the CASSI database or the journal's own website to find the official abbreviation rather than guessing.
Frequently Asked Questions
What is the CASSI abbreviation database?
CASSI stands for Chemical Abstracts Service Source Index. It is the authoritative database of abbreviations for journal titles used in chemistry citations. When you need to abbreviate a journal name for an ACS-formatted reference, you can search the CASSI database online through the CAS website. This ensures you are using the exact abbreviation recognized by the ACS and other chemistry organizations worldwide.
Does ACS use numbered or author-date citations?
ACS supports both systems, and the choice depends on the specific journal or your instructor's preference. Most ACS journals use superscript numbered citations in the text, with a numbered reference list at the end. Some journals use italic numbers in parentheses instead. A smaller number of ACS journals use author-date format, similar to APA. For class assignments, check your syllabus or ask your instructor which system to use.
How do I handle multiple authors in ACS format?
For references with up to about 10 authors, list all of them separated by semicolons. Each author's last name comes first, followed by initials. For example: Smith, J. A.; Johnson, B. C.; Williams, D. When there are more than 10 authors, list the first author followed by "et al." This generator formats single-author entries; for multi-author works, you can add additional authors by following the semicolon-separated pattern.
Why is the year bold in ACS citations?
ACS uses bold formatting for the year and italic formatting for the volume number to create a visual distinction between these numerical elements. This makes it easier to scan a reference list and quickly identify the publication year and volume. The bold year is one of the most recognizable features of ACS style and is required in all ACS-formatted references for journal articles.
Is this ACS citation generator free?
Yes, this ACS citation generator is completely free to use with no limits on the number of citations you can create. No sign-up or account is needed. The tool runs entirely in your browser and works on desktops, tablets, and phones alike. Generate and copy as many chemistry references as you need for your lab report, research paper, or thesis.