Crawl budget is a non-issue for the overwhelming majority of sites and only begins to matter at large scale, in the range of many tens or hundreds of thousands of URLs, or when a smaller site generates heavy crawl waste through things like faceted-filter explosions. The working floor is scale-or-waste, not page count alone, and Google has publicly said most sites never need to think about it, which is worth confirming against their current guidance since their stated position can shift. If your site has a few hundred or a few thousand clean URLs, crawl budget is not your problem, and effort spent on it is effort taken from things that would actually move you.
The fear usually arrives imported from enterprise SEO, where sites with hundreds of thousands of pages really do hit limits on how much Google will crawl in a given window. Carried onto an ordinary blog or business site, that fear is misapplied. A normal-sized site fits comfortably inside what Google is willing to crawl, so the budget never binds and there is nothing to optimize.
The first half of the floor is raw scale. As a site climbs into the tens and hundreds of thousands of URLs, Google’s willingness to crawl everything frequently stops keeping pace, and some pages get visited rarely or late. That is the point where allocation starts to be a real constraint rather than a hypothetical one.
The second half is waste, and this is where a smaller site can trip the threshold early. Faceted navigation that spins up a near-infinite combination of filter and sort URLs, endless parameter variations, calendar pages stretching to infinity, or session IDs in URLs can manufacture huge numbers of low-value pages. When crawlers burn their visits on that churn, the URLs that matter get crawled less, and the site behaves like a far larger one even though its real content is modest.
Before you worry about crawl budget at all, check two numbers: roughly how many URLs Google can actually find on your site, and how many of those are junk variations rather than real pages. If your URL count is modest and your crawl is clean, set the concern aside. If either number is alarming, the fix is usually pruning the waste, not chasing a budget you do not have.