Calculator Inputs
Enter citation and publication data for the evaluation year. Core impact factor fields are required. Five-year and immediacy fields are optional.
Example Data Table
| Example Input or Output | Sample Value |
|---|---|
| Evaluation Year | 2026 |
| Citations to 2025 items | 180 |
| Citations to 2024 items | 210 |
| Citable items in 2025 | 135 |
| Citable items in 2024 | 120 |
| Self-citations | 35 |
| Five-year citations | 980 |
| Five-year citable items | 620 |
| Two-Year Impact Factor | 1.5294 |
| Adjusted Impact Factor | 1.3922 |
Formula Used
Two-Year Impact Factor
Formula:
Impact Factor = (Citations to items from Y-1 and Y-2 during year Y) / (Citable items published in Y-1 and Y-2)
Adjusted Impact Factor
Formula:
Adjusted Impact Factor = (Two-Year Citations - Self-Citations) / Two-Year Citable Items
Five-Year Impact Factor
Formula:
Five-Year Impact Factor = Five-Year Citations / Five-Year Citable Items
Immediacy Index
Formula:
Immediacy Index = Current-Year Citations / Current-Year Citable Items
How to Use This Calculator
- Enter the journal name and select the engineering area.
- Set the evaluation year for the citation window.
- Provide citations received during that year for the prior two publication years.
- Enter citable item counts for those same publication years.
- Add self-citations if you want an adjusted estimate.
- Optionally enter current-year and five-year values for broader analysis.
- Press the calculate button to view the result section above the form.
- Use the export buttons to save the summary as CSV or PDF.
FAQs
1. What does journal impact factor measure?
It estimates how often recent journal articles are cited during a chosen evaluation year. Higher values usually suggest stronger recent citation visibility.
2. Which citations belong in the numerator?
Use citations received during the evaluation year for articles published in the previous two years. Keep the citation window consistent across all entries.
3. What counts as a citable item?
Citable items usually include research articles and reviews. Editorials, letters, and news items may be excluded depending on the reporting source.
4. Why should self-citations be tracked?
Self-citations can inflate perceived influence. The adjusted metric helps reviewers compare journals with a cleaner view of outside citation performance.
5. Why include a five-year impact factor?
Engineering citations can mature slowly. A five-year window often reflects sustained relevance better than a shorter two-year citation cycle.
6. Is this result an official database value?
No. This page provides an estimate from your entered data. Official scores depend on the exact indexing rules used by the reporting service.
7. What does the immediacy index show?
It shows how quickly articles published in the current year begin receiving citations. It is useful for identifying fast-moving research areas.
8. How often should I recalculate these metrics?
Recalculate whenever updated citation counts arrive. Quarterly reviews work well for monitoring trends, while annual reviews suit formal reporting cycles.