I was generous in my estimate for each of the line items. I chose a one room school house as an example because it's easy to grok, and anything larger would be cheaper due to economies of scale.
I would argue that economies of scale don't apply to education in the same way they apply to other businesses at large. Sure, you theoretically get the benefits of scale with central organization, buildings, centralized services, etc, but once you get to the classrooms themselves most of the cost simply scales linearly with the number of students.
This $28k number is false. Most parochial schools charge about $12k.
I'm not sure what we're talking about here anymore. You're using K-8 as the dominating factor for this gotcha a few times in this thread. There are more K-8 parochial schools, yes. "Most parochial schools charge about $12k" is true, unless you're talking about high school. Exactly 1 parochial school is less than $30k (SF Christian, at $16k). From there (limited to religious schools):
- Sacred Heart ($31k)
- Archbishop Riordan ($32k)
- Saint Ignatius ($34.6)
- Sacred Heart ($60k)
- Jewish Community School ($65k)
I might have missed some in here since I'm going by names, but given that SF Christian is the cheapest private high school on SF Chronicle's list[1] I don't think that matters for my point.
You started this thread with average cost per student across all SF public school students, which includes special needs, high school, etc, but move to median prices for debate, and structure most of your argument around the cheapest schools (K-8). Mea culpa on my end, though: you are correct that when I was saying "cheapest I've seen," there was an unfair modifier of "cheapest schools on my personal spreadsheet" which is limited to schools within a reasonable commute and that we'd be willing to send our kids to. You're absolutely correct that there are cheaper parochial schools available as long as you only need K-8.
Using averages for private schools, which feels more applicable to your starting premise, private schools in SF average $27k, $28k, and $52k, for elementary, middle, and high school (again, referencing SF Chronicle's data). I still feel comfortable with my original premise that averaging $28k per student across all of SFUSD students is not an absurd number.
So looking at the sticker prices (which I've listed above) may give an inflated view of total income.
Sure, that's fair! But we're not talking about
income, we're talking about average cost per kid. We can't actually know the details under the hood, but again, those schools specifically in your list are usually subsidized by a larger religious organization, so the sticker price doesn't truly reflect that cost anyway.
[1] https://www.sfchronicle.com/projects/2025/sf-bay-area-privat...