About Gera Tools

Gera Tools is a free collection of online calculators, converters, generators and everyday utilities. The goal is simple: give you fast, accurate, no-nonsense tools that work instantly — with no sign-up, no paywall on the basics, and no clutter.

What we do

We build and maintain thousands of focused, single-purpose tools across categories like maths and finance, text and data, conversion, health, images, dates and developer utilities. Each tool is designed to do one job well and explain how it works, with the methodology and assumptions shown on the page so you can trust the result.

Privacy first

Almost every tool on Gera Tools runs entirely inside your web browser. Your files, text and numbers are processed on your own device and are not uploaded to a server. See our Privacy policy for the full detail on advertising and analytics.

Why we built it

Most "free calculator" sites bury a simple tool under pop-ups, sign-up walls and pages of filler. Gera Tools started from a different premise: a single place where the tool you need works instantly, the method behind the answer is shown openly, and your data never leaves your device. We'd rather explain the formula than hide it — so every page shows the working, the assumptions, and where any reference figures come from.

How we research our data

Many of our tools rely on real, published reference data — tax bands, thresholds, average costs, and official figures. We take these from primary, authoritative sources and cite them on the page with an "as of" date. Sources we use include UK government and statistics bodies (GOV.UK, HMRC, ONS, DWP, NHS Digital, DEFRA, DfE), US federal sources (IRS, BLS, US Census, CMS, CDC, FEMA), and established industry datasets (for example Bankrate / LodeStar for housing costs, and EUCAST / CLSI for clinical reference). Where a figure changes annually, we update it on the relevant release. See our Methodology & data sources page for the full list and our update cadence.

Editorial standards & corrections

Tools and reference content are produced and maintained by the Gera Systems editorial team. We aim for accuracy and traceable sourcing, but we're not infallible — if you spot an error in any tool or figure, tell us via the Contact page and we'll investigate and correct it. Tools are provided for general information; for decisions that matter — financial, legal, medical or otherwise — please verify with a qualified professional (see our Disclaimer).

Who runs this site

Gera Tools is operated by Gera Systems Ltd, a company registered in the United Kingdom that builds practical software for a global audience. We are an independent publisher. For enquiries, corrections, or legal/registration details, contact us via the Contact page.

Get in touch

Found a bug, want a new tool, or have feedback? We'd love to hear from you — visit our Contact page.