Journal profile · Computer Science, Theory & Methods
ACM Transactions on Computer Systems
ISSN 0734-2071 · eISSN 1557-7333 · Association for Computing Machinery (ACM) · UNITED STATES · Quarterly
ACM Transactions on Computer Systems: CAS Zone 4 · Computer Science (2025 upgraded edition); impact factor 1.92; hybrid open access; median 236 days to acceptance (56 articles, last 24 months); community-reported acceptance: easy; 30 articles in 2025; indexed in SCIE and Scopus.
Scope
Aims, scope and focus
ACM Transactions on Computer Systems is published by Association for Computing Machinery (ACM) and is in Zone 4 of Computer Science in the CAS Journal Ranking (2025 upgraded edition). By OpenAlex counts of its recent articles, its largest topics are Parallel Computing and Optimization Techniques, Distributed systems and fault tolerance and Advanced Data Storage Technologies, together about 49.5% of its articles. Its main subfields are Computer Networks and Communications. (generated from OpenAlex topic counts and CAS ranking data)
ACM Transactions on Computer Systems (TOCS) presents research and development results on the design, implementation, analysis, evaluation, and use of computer systems and systems software. The term "computer systems" is interpreted broadly and includes operating systems, systems architecture and hardware, distributed systems, optimizing compilers, and the interaction between systems and …
From the journal's Aims & Scope
Research area (LetPub): Computer Science, Theory & Methods
Editor-in-chief Sam H. NohPublisher website
Main research topics OpenAlex counts of recent articles; shares are approximate
- Parallel Computing and Optimization TechniquesComputer Science18.7%
- Distributed systems and fault toleranceComputer Science16.2%
- Advanced Data Storage TechnologiesComputer Science14.6%
- Cloud Computing and Resource ManagementComputer Science8%
- Distributed and Parallel Computing SystemsComputer Science4.9%
- Security and Verification in ComputingComputer Science4.2%
- Caching and Content DeliveryComputer Science4.1%
- Interconnection Networks and SystemsComputer Science3.9%
Rankings & indexing
CAS ranking and database indexing
CAS Journal Ranking
CAS Journal Ranking, upgraded edition (March 2025)Computer Science Zone 4
| Level | Category | Zone |
|---|---|---|
| Major | Computer Science | Zone 4 |
| Minor | Computer Science, Theory & Methods | Zone 3 |
Top journal: noReview journal: no
CAS Xinrui Journal Ranking (March 2026)Computer Science Zone 4
| Level | Category | Zone |
|---|---|---|
| Major | Computer Science | Zone 4 |
| Minor | Computer Science, Theory & Methods | Zone 4 |
Top journal: noReview journal: not marked
CAS Journal Ranking, previous upgraded edition (December 2023)Computer Science Zone 4
| Level | Category | Zone |
|---|---|---|
| Major | Computer Science | Zone 4 |
| Minor | Computer Science, Theory & Methods | Zone 4 |
Top journal: noReview journal: no
Database indexing
SCIEScopusLetPub
International journal early-warning lists: not listed in any editionLetPub
Editions, and major and minor categories, are shown separately and never merged into one zone; check which edition your institution uses before you submit or report.
Metrics
Impact metrics and publication volume
Impact
- Impact factor
- 1.92LetPub ·
- CiteScore 2026-06
- 2.1LetPub ·
- SJR 2026-06
- 0.29LetPub ·
- SNIP 2026-06
- 0.27LetPub ·
- h-index
- 63LetPub ·
- h-index
- 140OpenAlex ·
- i10-index
- 443OpenAlex ·
- 2-year mean citedness
- 2.27OpenAlex ·
- Self-citation rate
- 0%LetPub ·
- Share of gold OA articles
- 32%LetPub ·
Volume
- Articles per year
- 12LetPub ·
Articles by year OpenAlex count · 633 in total · the current year is incomplete
| Year | Articles | Open access | Citations |
|---|---|---|---|
| 2026 | 27 | 24 | 8 |
| 2025 | 30 | 26 | 114 |
| 2024 | 7 | 5 | 23 |
| 2023 | 7 | 6 | 55 |
| 2022 | 4 | 4 | 29 |
| 2021 | 6 | 5 | 61 |
Sources count differently and were observed at different times, so each source's own value is kept; "publisher" marks figures from the journal's website.
Review & acceptance
Review time and acceptance
Review time from article dates manuscript dates registered with Crossref · to
236 daysMedian, submission to acceptance · P25–P75 162 days – 313 days
- Acceptance to online
- median 82 days (56 articles)
- Submission to online
- median 338 days
- Sample
- 56 articles with submission and acceptance dates (65 in the window); the latest was accepted on
Only articles that were accepted and published are counted, not the time spent on rejected manuscripts, so this usually runs longer than a publisher's "time to first decision".
Other sources
- Average review time (community reports)
- over 12 weeksLetPub ·
- Average acceptance (community reports)
- EasyLetPub ·
Community reports come from authors' own submissions (confidence 0.5) and are not a promise from the journal; for publisher figures, the journal's own definitions apply.
Fees & open access
APC and open-access policy
Hybrid open accessLetPub
A subscription journal in which authors can pay to publish their article open access.
No source has fee information yet; check the journal's website.
A hybrid journal charges the APC only when the author chooses open access; publishing under the subscription model is usually free.
The journal's website is authoritative for fees; sources were observed at different times and each keeps its own value, without averaging.
Submission
Article types and submission policies (journal website)
Policy excerpts from the journal's websiteAuthorship, Peer review
- Authorship
New ACM Policy on Authorship covering key topics including the use of generative AI tools. Model summary
New ACM Policy on Authorship ACM has a new Policy on Authorship, covering a range of key topics, including the use of generative AI tools.
Source ↗Publisher website ·- Peer review
ACM Publications Board approved an updated Peer Review Policy; FAQ covers confidentiality, use of large language models in peer review, conflicts of interest, and other concerns. Model summary
ACM Updates Its Peer Review Policy ACM is pleased to announce that its Publications Board has approved an updated Peer Review Policy.
Source ↗Publisher website ·
Excerpts are quoted from the journal's website; "model summary" lines are written by Workers AI and checked against the text. The journal's website is authoritative.
Profile
Publication details and official links
- Publisher
- Association for Computing Machinery (ACM)
- Country or region
- UNITED STATES
- Language
- English
- Frequency
- Quarterly
- ISSN
- 0734-2071
- Electronic ISSN
- 1557-7333
- Latest issue on the website
- Volume 44, Issue 3 (August 2026)
- Official links
- Journal homepage ↗OpenAlex
- Submission system ↗Publisher website
- Special issues ↗Publisher website
FAQ
Frequently asked questions about ACM Transactions on Computer Systems
What CAS zone is ACM Transactions on Computer Systems in?
In the 2025 upgraded edition of the CAS Journal Ranking, ACM Transactions on Computer Systems is in Zone 4 of Computer Science, and in Zone 3 of the minor category Computer Science, Theory & Methods. In the 2026 Xinrui edition it is in Zone 4 of Computer Science. Zones from different editions, and from major and minor categories, are not interchangeable.
What is the impact factor of ACM Transactions on Computer Systems?
The latest impact factor listed by LetPub is 1.92; CiteScore 2.1, h-index 140.
How long does peer review take at ACM Transactions on Computer Systems?
Based on the dates recorded on 56 articles published between October 2024 and October 2026 (the last 24 months), the median time from submission to acceptance is 236 days (interquartile range 162–313 days); authors report an average review time of over 12 weeks; the community-reported acceptance is “Easy”. Article statistics cover accepted papers only, publisher figures follow the journal's own definitions, and community reports come from authors' own submissions; none is a promise from the journal.
Which databases index ACM Transactions on Computer Systems?
According to LetPub and DOAJ records, ACM Transactions on Computer Systems is indexed in SCIE and Scopus.
Is ACM Transactions on Computer Systems open access, and what is the APC?
ACM Transactions on Computer Systems is a hybrid journal. Fee information is not available yet; check the journal's website.
Sources and updates
The facts on this page come from LetPub, OpenAlex, Publisher website; every figure is tagged with its source and the date it was observed, and conflicting values are kept per source. LetPub source page: view ↗ (archived 2026-08-24). Last updated: .