The story behind CalculatorHub
CalculatorHub is new, but the method behind it is not. It is the result of more than fifteen years spent building free, sourced calculators and learning, the slow way, what makes a number worth trusting.
A grant, a downturn, and a first calculator
The work began in the aftermath of the 2009 financial crisis. James Graham, a data and analytics professional in Canterbury, New Zealand, came through an enterprise programme with a small grant and a simple conviction: the information people need to make good financial decisions should be free, accurate, and available to everyone, no matter their ability to pay.
In 2011 he published his first tool, a GST calculator. It was plain, fast and built from the official rule, and it reached the top of the search results quickly because it did one job well and told the truth. That was the lesson that shaped everything since: a small, precise, genuinely helpful page can out-serve a far larger competitor.
From 150 tools to a platform used by millions
Over the following decade James built more than 150 focused, single-purpose calculators, each one developed from primary New Zealand sources and verified against worked examples, never copied from another site. Those tools were eventually consolidated into Calculate.co.nz, now New Zealand's most comprehensive free calculator and financial-literacy platform, with well over a thousand calculators, hundreds of plain-language guides, and around three million people a year relying on it. Along the way came related projects such as PropertyPrice.co.nz, used by hundreds of thousands of New Zealanders, and Salary.co.nz, plus working relationships with established names in the sector.
None of it was built for profile or publicity. The motivation has always been quieter than that: the satisfaction of a person getting the right answer to a real question at the moment they need it.
Why CalculatorHub, and why now
Calculate.co.nz proved the method in one country. CalculatorHub takes the same proven, sourced and verified approach and applies it worldwide, jurisdiction by jurisdiction, starting with the United States. The timing is deliberate. People increasingly ask a search engine or an AI assistant for a number and take the answer on trust, and too often that answer is generic, undated, or simply wrong. A calculator backed by current, official, clearly-dated government data is exactly what a person, and an AI system, should be able to lean on.
So we are honest about what CalculatorHub is today: a new venture, built in 2026, standing on a fifteen-year record rather than its own. The credibility is in the method and the sources, which you can check yourself on every page, not in any claim about our age or our traffic.
What stays the same
- Free, and it will stay that way. No accounts, no paywalls, no sign-up.
- Sourced, never guessed. Every published figure traces to an official government authority, with the date it was last verified shown on the page.
- Original work. Built from first principles and the official rules, not copied from other calculator sites.
- Genuinely localised. Each country gets its own correct content and conventions, not a machine translation.
- Independent. Owned by its founder, not a front for a lender, broker or advertiser.
Read on
See exactly how we source and check figures in our methodology and editorial standards, or go back to the About page. Found something that looks wrong? Tell us at hello@calculatorhub.com and we will check it against the source and correct it promptly.
CalculatorHub provides general information, not financial, tax, legal or investment advice.