My gut says that people nowadays just go to chatgpt for things like this.
Or google’s automatic snippets handle it just fine

Hi! I've been doing SEO since 2008, so I'd like to think I know some things.

A few reasons:

1.) I'm inclined to go with what Swizec said -- people are going to ChatGPT or using Google snippets for this, BUT that doesn't mean you still can't rank. You can. It just requires you to change your approach:

• optimize for more long-tail keywords because those can't be fully answered in snippets (example: you might be optimized for "RREF calculator" right now, but you'll want to instead optimize for something like "how to solve linear algebra problems with RREF calculator." The intent here is deeper.

• you can also integrate AI using an API. This is wayyyy above my pay grade, so I can't help you with the actual execution of this part, but if you use an API, your calculators can still get traffic, even if indirectly. (And there are potential monetization opportunities here.)

• optimize like hell for snippets using schema markup.

2.) Your pages are THIN, so that'll take a hit on Google, especially with algorithm changes. Also impacting this are: duplicate content, lack of original content, lack of authority, lack of trust signals.

• add more in-depth educational content (like tutorials) and more value-added features (like enhancing the calculators with diagrams and step-by-step explanations) to focus more on UX. You can also link to academic sources for authority. Get more backlinks.

Some questions for you to think about. You don't have to answer them here, of course.

• are your calculator pages recently updated?
• how unique or in depth are the explanations when someone uses the calculators?
• when's the last time you ran an audit? Look for crawl errors, page speed, indexing issues, etc.
• are all your pages mobile optimized? What's your AMP compliance score?
• when's the last time you reviewed your backlinks for relevance and quality?
• are you doing any link-building activities? Are they spammy?
• when's the last time you did a competitor analysis?

Here's what I recommend (based on having zero answers to those questions lol):

• run a site audit to get a better idea of how your site is performing...or not performing. Look for things like crawl errors, indexing issues, backlink quality, page speed, mobile usability, lost keywords, etc. Fix all the errors first.

• analyze user behavior and look at things like bounce rate, exit pages, session durations to see how long people are staying, when they're leaving, and how long they're staying. See how you can get them to stay longer (like including more in-depth explanations with diagrams + edu content).

• optimize the hell out of your content and start optimizing for long-tail keywords that align with what will keep people on the page longer (gave you an idea above).

• improve your technical SEO if you need (like adding schema markup, fix any broken links, increase page speeds, optimize for mobile, etc.)

• build more authority (getting better backlinks, share tools in relevant forums, etc)

• reiterate your strategy, keep up with competitors, be forward thinking with AI/learn how to work with it instead of against it, and keep up with it if/when the algorithm updates.

This advice is pretty vague without running a site audit or doing way more extensive research, but it should get you started in a good direction.

I think the calculator space like that is super competitive. If you don't have any penalties on your site you'll just need hundreds of authoritative backlinks to rank.