About 1234Tools

Free tools that stay out of your way

1234Tools is a growing collection of 1,169+ calculators and converters covering finance, mathematics, engineering, health and everyday odd jobs. No account, no server round-trip, no upsell — just the answer.

Why it exists

Most online calculators bury a simple sum under ad networks, tracking scripts and a sign-up wall. 1234Tools takes the opposite approach: every tool is a small, self-contained page that does the maths in your browser and throws nothing away. There's no backend to send your numbers to, because there's no backend involved at all.

The project started as the tools section of MVR IT Services, a UK software company, and grew large enough to deserve its own home — which is why it now lives at 1234tools.com.

What makes it different

Runs in your browserEvery calculation happens on your device. Nothing you type is sent anywhere or logged.

No account, everOpen a tool and use it. There is nothing to sign up for and nothing to remember.

Works offlineVisit a tool once and it's installed as an app — it keeps working with no signal at all.

Free, no catchNo premium tier, no paywalled results, no ads that get in the way of the numbers.

Who builds it

1234Tools is built and maintained by MVR IT Services LTD, a UK-registered software company (Company No. 10251131) that also builds custom platforms for schools, hospitals, retailers and events. If you need bespoke software rather than a free calculator, that's a conversation for their services page — 1234Tools itself stays free and ad-light.

Found a bug, or want a tool that doesn't exist yet?

Get in touch — most tools on this site exist because someone asked for them.