Privacy

The short version: fieldcalc is free to use, and like most free tools it pays its way through advertising and through anonymous data about which calculators get used. The measurements you type into a calculator are still worked in your browser and are not sent anywhere. Below, in plain language, is exactly what is collected and what you can do about it.

What runs on your device only

The arithmetic is local: the dimensions you type are calculated in your browser and never transmitted. Whether you last used metric or imperial, and a private tally of which calculators you open (so your most-used show first), are kept in your browser's local storage. Clearing your site data removes them.

What the site records

So we can see which calculators are worth building more of — and so the site can earn its keep — fieldcalc records first-party usage data on its own servers: the pages you view, a coarse random visitor id kept in your browser (so return visits can be counted without knowing who you are), and which site referred you. This is first-party — it goes to fieldcalc's own systems, not a third-party tracker following you around the web. It may be reported in aggregate or shared with partners as trends; it is not a public profile of you.

If you make an account

An account is optional and never required. If you sign in — with a one-tap email link, no password — we store your email and your synced preferences (units, most-used) so they follow you between your devices. The sign-in link is sent through a transactional email provider on our behalf. Your email is used to sign you in and, if you opt in, for the occasional note when a new calculator goes up. Sign out or ask us to delete the account and it is gone.

If you add a work profile

Signed-in tradespeople can optionally leave a short "looking for work" profile — trade, location, contact details and a note. If you do, we store it so we can pass suitable work leads to you or reach out ourselves, and we may share it with employers looking to hire. Don't add one and none of that applies; ask and we'll delete it.

If you type your email into the newsletter box, it is kept on our own Cloudflare database with which of our sites you signed up from, and used to send the occasional note. It is never sold as a standalone list, and every email carries a one-click unsubscribe.

Advertising

fieldcalc may carry advertising to stay free. Where an ad network is used it can set its own cookies and collect data under its own policy; where ads are sold directly they are a static image and a link with no third-party script. This page will always say which is in use.

Your choices

Clearing your browser's site data removes everything stored on your device, including the visitor id. You can unsubscribe from the newsletter in one click, sign out of an account at any time, and email [email protected] to have your account, work profile or newsletter entry deleted. A browser in private mode or with tracking protection on will limit what any of this can record.

New tools, now and then

We add calculators most weeks. Drop your email and get a short note when a new one lands — nothing else, no selling your address, one-click out.