How to Write an Abstract: Step-by-Step Guide With Examples (2026)
Learn how to write an abstract for a research paper, thesis, or conference submission. Includes templates, examples from published papers, and a checklist for every abstract type.
An abstract is a 150-300 word summary of your research paper. It should answer: Why (background + gap), How (methods), What (results), and So What (conclusion/implications). Write it LAST, after the paper is complete. Use past tense for methods/results, present tense for conclusions. Never cite sources in the abstract.
TL;DR: An abstract answers four questions in 150-300 words: Why? (background + gap), How? (methods), What? (results), So What? (conclusions). Write it after the paper is done. Use past tense for methods/results, present tense for conclusions. No citations.
Your abstract is the most-read part of your paper. Database readers, conference reviewers, and busy professors often read only the abstract to decide whether to read the full paper. A weak abstract means your paper doesn't get read — no matter how good the research.
This guide shows you exactly how to structure an abstract, with templates and real examples from published papers.
An abstract is a concise, standalone summary of a research paper, thesis, or conference presentation. It typically runs 150–300 words and appears at the top of the paper, after the title and author information.
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Frequently Asked Questions
- How long should an abstract be?
- Most journals require 150-300 words. APA style recommends 150-250 words. Structured abstracts (common in medical journals) are typically 250-350 words with labeled sections. Conference abstracts may be 200-500 words. Always check your target journal's specific requirements.
- What is a structured abstract?
- A structured abstract uses labeled sections — typically Background, Methods, Results, and Conclusions (sometimes Objective, Design, Setting, Participants, Results, Conclusions). Required by most medical and health science journals (JAMA, BMJ, The Lancet). Makes the abstract easier to scan quickly.
- Should I write the abstract first or last?
- Write it LAST. The abstract summarizes your completed paper, so writing it first means revising it multiple times as your paper evolves. Exception: grant proposals and conference submissions require abstracts before the full paper exists — in that case, write a preliminary abstract and update it later.
- Can I cite references in an abstract?
- Generally no. APA explicitly says no citations in abstracts. Some journals in STEM fields allow 1-2 key citations. Chicago and MLA discourage it. If you must cite, use the full citation (Author, Year) since the abstract may be read independently from the reference list.
- What tense should I use in an abstract?
- Background/Introduction: present tense ('Depression affects...'). Methods: past tense ('We recruited...'). Results: past tense ('Participants showed...'). Conclusions/Implications: present tense ('These findings suggest...'). This pattern reflects the convention that established knowledge is present tense, your specific study actions are past tense.
- What is the difference between an abstract and an introduction?
- An abstract is a standalone summary of the ENTIRE paper (background, methods, results, conclusions) in 150-300 words. An introduction only covers background, literature review, and the research question — it does NOT include results or conclusions. The abstract is read independently; the introduction is read as part of the paper.