About National Calculators

National Calculators is a free set of calculators for salary, tax, benefits, health and everyday life. Each country tax calculator is localised to a specific country, so the figures match the local rules, currency and tax year rather than a generic one-size answer. Universal tools such as BMI and loan calculators work everywhere, adapted to your currency and units.

How the figures are kept accurate

Tax and benefit numbers are sensitive, so every country-specific calculator follows the same discipline:

• Sourced. Every parameter comes from an official government or tax-authority publication, linked on the page.
• Dated. Each page shows the tax year the figures apply to and when it was last reviewed.
• Cross-checked. Headline figures are verified a second time against independent official sources.
• Factchecked. Each calculator is tested against known worked examples before it is published. If it does not reproduce the official result, it does not go live.

The full process, including how health figures and the comparison datasets are handled, is set out in our editorial standards.

Even with that process, the calculators are estimates for general guidance, not financial, tax or legal advice. Individual circumstances vary and rules change. Always confirm with the official sources before making decisions.

Who builds it

National Calculators is built and maintained by Vikas Dulgunde, a London-based software engineer who has spent the past several years building financial tools and data products. Every calculator ships with reference cases checked against official worked examples (HMRC, national tax authorities, the World Bank and the US Bureau of Economic Analysis among them) before it goes live, and is rechecked whenever rates change. It is an independent project, not affiliated with any government or tax authority. If you spot a figure that looks wrong, please get in touch; corrections are taken seriously and applied quickly. You can connect with the author on LinkedIn.

Countries covered

United Kingdom, Ireland, United States, Canada, Australia, New Zealand, Switzerland, Austria, Belgium, Norway, Denmark, Finland, Luxembourg, United Arab Emirates, Singapore, Hong Kong, South Africa, Worldwide, with more added over time. Universal tools such as BMI and loan calculators work everywhere.