About ziffaro

ziffaro is a growing collection of free online calculators and tools. The idea is simple: when you need to figure a number — a paycheck after taxes, a mortgage payment, an average, a citation — you should get a clear, correct answer in seconds, with the method shown and no signup or clutter in the way.

Who is behind ziffaro

ziffaro is built and operated by Honeygoat GmbH, a company based in Reinach, Switzerland, founded and run by Christoph Ballmer. Honeygoat runs a small portfolio of focused calculator and tools sites; ziffaro is the US-market member of that family. A named company and person stand behind the site, are responsible for what it publishes, and can be contacted directly — that accountability matters, especially for tools that touch money or health.

How we build each tool

Every calculator is built from a documented formula or an official standard, not guesswork. The math runs entirely in your browser, so your inputs stay on your device, results update instantly as you type, and there is no account to create. For tools that touch money or health — tax, mortgage, paycheck or medical estimates — we base the logic on the relevant authority (for example the IRS for US tax figures or the ADA for A1C conversions) and cite that source on the page. Tax and rate data are kept to the current year and labelled as estimates, because rules change and local details vary.

Accuracy & limitations

We build each tool carefully and check the math against worked examples, but results are estimates for general information only and are not professional, medical, financial, tax or legal advice. Figures such as tax brackets, property-tax rates and interest rates change over time and depend on your individual situation, including local rules the calculators do not model. Always confirm important decisions with the relevant official source or a qualified professional.

Contact

Questions, corrections or feedback are welcome — if you spot a number that looks off, tell us and we will check it. Reach the team at info@ziffaro.com.

Honeygoat GmbH · Kägenstrasse 21, 4153 Reinach, Switzerland · Reg. CH-270-4005459-5