About Calquly

Calquly is a collection of free online calculators. There is no company behind it and no team page to show you — it is a small independent site, built and maintained by one person, that exists because the calculators people search for every day are mostly hosted on sites that are slow, cluttered and impossible to use on a phone.

How it works

Every calculation runs in your browser using JavaScript. Nothing you type is sent to a server, stored, or logged, because there is no server involved in the maths at all. That also means the calculators keep working if your connection drops after the page has loaded.

How the numbers are checked

The calculation logic is written as plain functions, kept separate from the interface, and covered by an automated test suite that runs against known results and edge cases — leap years, month boundaries, shifts that cross midnight, division by zero, negative values and empty input. A calculator does not go live until its logic passes.

That does not make it infallible. If you find a result you believe is wrong, report it with the numbers you entered — that is the fastest way to get it fixed, and a new test goes in alongside the fix so the same error cannot come back.

What these calculators are not

They are general-purpose tools for everyday arithmetic. They are not financial, legal, medical, tax or engineering advice, and the construction calculators in particular produce planning estimates rather than specifications. Anything with money, safety or legal consequences attached should be confirmed by a qualified professional.

Money

The site is free and always will be. It is funded by advertising, which is kept out of the way of the calculators themselves — no interstitials, no pop-ups, and nothing between you and the answer you came for.