Type a measurement the way the tape reads it — 12, ft, 4, in, 3, /, 8 — then an operator and the next one, and press =. The icons along the top open the eight material calculators and your recent answers. On a wide screen, open it in a full window and it switches to two panes, the keypad beside the calculators. The vibration setting is there and does nothing in a browser. It is the whole app that is coming to the App Store and Google Play — built from the same code, and not in either store yet.
What this page does and does not do
- Your history stays in this browser. Recent answers and saved numbers are kept in this browser’s storage, not in an account — so they do not follow you to another browser, another computer or your phone, and clearing your site data or using a private window loses them.
- There are no ads here. Not as a favor: the ad network has no browser version, so there is nothing to show. The phone app will carry a banner and an occasional full-screen ad after a calculation; this one carries neither.
- Nothing is sold, and nothing you calculate is sent anywhere. No in-app purchases, no account and no sign-in. This build has no analytics, no crash reporting and no advertising in it — the phone app’s, described in its privacy policy, are left out of the browser version — and in a session measured against it the only requests that left this domain were for the fonts below. It sets no cookies of its own. This page does carry the same analytics as every other page on the site, which is described in the privacy policy; in the EEA, the UK and Switzerland it stays off until you accept the banner.
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Two fonts come from Google. The rendering engine is
served from this domain rather than from Google’s CDN, which
is not the framework default and was changed deliberately. The
typeface is the exception: the browser fetches
Roboto and, for the ÷, × and − keys, Noto Sans Symbols from
fonts.gstatic.com. That is Flutter’s default when an app names no font of its own, and files are requested as glyphs are needed, so a screen we did not open could ask for another. Checked against this build on 25 September 2026 rather than assumed, and we spend a lot of this site asking other people to disclose things like that.
If it runs badly
It is about two and a half megabytes the first time in Chrome and a little over three in Safari, most of it the rendering engine rather than the calculator. Those figures are this build’s own files compressed locally on 25 September 2026 rather than a reading taken off the wire, so what Cloudflare actually serves may differ a little. It also leans on the browser rather than the phone’s graphics chip, so an old laptop or a weak connection will feel it, and the first load is slower than the second because nothing is cached yet. There is no installed version to fall back on yet. There is more about the app, including what it costs and what it collects, on its own page.