Difference Between SCI and Scopus Indexed Journals: A Complete Guide for Researchers

If you've been told to "publish in an SCI or Scopus journal" without anyone explaining what that actually means, you're not alone — it's one of the most searched, least clearly answered questions among M.Tech and PhD scholars. SCI and Scopus are often used interchangeably in casual conversation, but they're run by different companies, use different evaluation criteria, and index a different (and overlapping, but not identical) set of journals. Getting this wrong can mean submitting to a journal that satisfies neither your university's requirement nor your own publication goals.

Here's the difference, in plain terms.

What Is SCI (Science Citation Index)?

SCI — and its expanded version, SCIE (Science Citation Index Expanded) — is a citation index owned and maintained by Clarivate, as part of the Web of Science database. It's one of the oldest and most selective citation indexes in academic publishing, originally created by Eugene Garfield in the 1960s.

Key characteristics:

1. Highly selective — journals go through a rigorous evaluation process before inclusion, covering editorial quality, citation impact, and publishing standards
2. Assigns an Impact Factor — SCI/SCIE journals receive a Journal Impact Factor (JIF), calculated annually and published in Clarivate's Journal Citation Reports (JCR)
3. Narrower coverage — fewer journals qualify compared to Scopus, particularly in emerging or regional research areas

What Is Scopus?

Scopus is a citation and abstract database owned by Elsevier. It's broader in scope than SCI/SCIE and indexes a significantly larger number of journals, conference proceedings, and book series across science, technology, medicine, social sciences, and humanities.

Key characteristics:

1. Broader coverage — includes many journals that aren't SCI-indexed, along with a large number that are
2. Uses CiteScore, not Impact Factor — Scopus journals are ranked using CiteScore, along with SJR (SCImago Journal Rank) and SNIP (Source Normalized Impact per Paper)
3. Quartile ranking (Q1–Q4) — Scopus journals are categorized into quartiles by subject area, which universities often use as a benchmark instead of, or alongside, Impact Factor

SCI vs Scopus — Side-by-Side Comparison

Are All SCI Journals Also on Scopus?

Not necessarily — and this is where most confusion comes from. There's overlap, but it isn't total:

1. Many SCI/SCIE journals are also indexed in Scopus, since Scopus's broader net picks up most high-quality journals
2. Not all Scopus-indexed journals are SCI/SCIE indexed — Scopus includes many journals that haven't gone through Clarivate's more selective evaluation
3. A journal can be Scopus-indexed but not SCI-indexed, and this matters a great deal if your department specifically requires SCI/SCIE

If your university, department, or scholarship requirement says "SCI journal only," a Scopus-indexed journal that isn't also SCI-indexed will not satisfy that requirement, even though it sounds similarly prestigious.

Which One Does Your University Actually Require?

This is the single most important thing to check before you shortlist a journal — not after. Requirements vary by:

1. University/department policy — some explicitly require SCI/SCIE, others accept Scopus, and many now accept either
2. UGC-CARE list (India) — a separate list maintained by the University Grants Commission, distinct from both SCI and Scopus, that many Indian universities also reference
3. Funding body or scholarship conditions — some fellowships specify a minimum quartile or impact factor threshold tied to one index specifically

Before you invest months writing and submitting to a journal, confirm in writing (department circular, supervisor email, or official guideline document) exactly which index — and which quartile, if any — your requirement refers to.

How to Check If a Journal Is SCI or Scopus Indexed

1. For SCI/SCIE: Search the journal in Clarivate's Master Journal List (mjl.clarivate.com) — if it appears there under SCIE, it's SCI-indexed
2. For Scopus: Search the journal directly on Scopus's source list (scopus.com/sources) — this confirms both indexing status and current quartile/CiteScore
3. Avoid relying on the journal's own website claims alone — predatory and low-quality journals sometimes falsely claim SCI or Scopus indexing; always verify independently through the official databases above

Which Should You Target?

There's no universal "better" answer — it depends entirely on your requirement and timeline:

1. If your department explicitly requires SCI/SCIE, target that directly — a Scopus-only journal won't count, regardless of quality
2. If your requirement allows either, Scopus often has more journals actively matching your specific sub-field, which can mean a faster, better-fit submission
3. If you're early in a PhD and building a publication record, a well-ranked Scopus Q1/Q2 journal is often more attainable and still highly credible than chasing a narrow set of SCI options

We Help Scholars Navigate This

Journal selection is one of the most common places scholars lose months — submitting to a journal that doesn't match their university's requirement, or discovering mid-review that the "SCI journal" they submitted to was actually Scopus-only. We work with M.Tech and PhD scholars to shortlist the right indexed journals for their specific requirement, draft and format the paper to match, and get it through review without the trial-and-error.

Talk to us on WhatsApp or explore our M.Tech & PhD Assistance services at researchzones.com to get started.