LLM Calc is a set of free, fast, browser-based calculators for people building with AI — LLM API cost estimators, token counters, context-window checks, plus a few general developer and freelance tools.
Every tool runs entirely in your browser: no signup, no upload, nothing stored on a server. The goal is simple utilities that load instantly and just work.
Model pricing is refreshed daily from a public, community-maintained dataset rather than typed in by hand, so the numbers stay close to current. Each pricing page names its source and links to the vendor's official page — always confirm there before budgeting.
New tools are added regularly. If there's something you'd find useful, say so on the contact page.
Most LLM pricing calculators on the web are typed in by hand and then abandoned. Rates change, models are replaced, and the page quietly keeps showing figures that were right a year ago — which is worse than showing nothing, because the numbers still look authoritative. The pricing here is generated from a data file that a scheduled job refreshes, so it goes stale only if the job stops, and the sync date is printed on the page so you can tell.
Every page is static HTML with a small amount of JavaScript, served from a CDN. There is no backend, no account system and no database. Calculations happen in the browser, which is why the pages load instantly and why nothing you type reaches a server.
Model rates come from a public, community-maintained dataset rather than from scraping vendor pages, because the vendors publish no pricing API and their pricing pages are rendered in ways that break automated reading. That choice is a trade-off, and it is stated on every page that uses the data, along with a link to the official source for verification. If a figure disagrees with the vendor, the vendor is right — and a short email gets it corrected.
People building with LLM APIs who need a number before they commit: what a feature will cost at volume, whether a prompt fits, which rate limit binds first. The developer and freelance calculators cover the adjacent arithmetic that tends to come up in the same week.
This site is run by one person, not a company. It is funded by advertising, which pays for the domain and nothing else at present. No vendor pays for placement, and the model list is chosen for coverage rather than for any commercial relationship — there are none. What the site collects, and what it doesn't, is set out in the privacy policy.