> For the complete documentation index, see [llms.txt](https://docs.unsub.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.unsub.org/how-it-works/how-do-we-calculate-your-oa-publish-spend.md).

# How do we calculate your OA Publish spend?

**Note: The** [**APC Report**](/how-to-guides/apc-report.md) **contains different journals than the Scenarios.** It not only includes journals in your base COUNTER file, but \*all journals\* which authors from your institution have published Open Access. Specifically, it includes Gold OA journals as well as subscription journals.

We have a 15 minute video that explains the calculations in detail [here](https://vimeo.com/417000352).

An overview of the columns:

**OA Type**

Whether OA papers published in this journal are available as Gold OA or Hybrid OA. Gold is when the journal is fully OA, and Hybrid is when some of the papers in the journal are only available via subscription.\\

**APC Price**

The listed APC (Article Processing Charge) of the journal. This is the price that many journals charge their authors to publish a paper as Open Access in the journal.\\

**Number APC papers**

The number of papers in this journal, annually, that were published as Gold or Hybrid OA and include an author from your institution.\\

**Total fractional authorship**

Usually the corresponding author of a paper is the one who pays its APC. OpenAlex now identifies the corresponding institution on most articles, so when your institution is the corresponding institution on an article we attribute the full APC to you. When corresponding-institution information is not available for an article, we fall back to fractional authorship: every author is treated as equally likely to be the corresponding author. So, for example, if someone in your institution published an OA paper where they were the only author their fractional share would be 1.0, and if another team published an OA paper with three authors and only one from your institution their fractional share would be 0.3.

**APC dollars spent**

Our estimate of the APC dollars spent by your institution annually over the last five years. Calculated by multiplying the total fractional authorship by the APC price.

The total publisher APC spend for the university is the sum of all APC dollars spent across all journals (all rows in this table).