Editorial policy

Who writes this

Everything on this site, both the tools and the articles, is written and maintained by Mubarak Marzoon, who built it. There is no content team, no freelance pool and no syndicated material.

What that means for credibility. The author is a software engineer. He is not a doctor, a dietitian, a pharmacist, an accountant or a regulated financial adviser, and this site does not claim otherwise. Where an article touches medicine or personal finance, its job is to explain published guidance accurately and point you at the original, not to substitute for a professional who knows your situation.

Where the information comes from

Health and money articles are built from guidance published by named institutions, and the specific pages used are listed at the foot of each article. The bodies relied on most are:

• The NHS and the National Institute for Health and Care Excellence
• The World Health Organization
• The US Centers for Disease Control and Prevention
• The UK Office for National Statistics and GOV.UK
• MoneyHelper, the UK government-backed money guidance service
• Peer-reviewed studies indexed on PubMed, cited individually where a specific finding is quoted

When an article refers to a study, it links to that study. A claim you cannot check is worth very little, and "studies show" without a citation is the standard way of dressing up an assertion as evidence.

How the calculators are built

Every tool states the formula it uses, in the page body, in plain arithmetic. Nothing is hidden behind a black box, and you can reproduce any result here with a pocket calculator if you want to check it.

Where a tool depends on published constants, those constants are traceable. The MET values in the calories tool come from the Compendium of Physical Activities. The stair rules come from building regulations. The ring and shoe size conversions are anchored on published reference points rather than interpolated from guesses, which is a mistake earlier versions of two of those tools genuinely made and which was fixed once it was caught.

Every calculator is tested against known values before it ships. If a tool cannot reproduce a result that is independently verifiable, it does not go live.

What we say when the evidence is weak

Several articles on this site exist mainly to explain that a number people trust is less reliable than it appears. The child height predictor states that its range is 20 cm wide. The ovulation calculator states that only about a third of women ovulate inside the window a calendar predicts. The calories tool states that the figure is smaller than a fitness tracker will tell you, and explains why.

This is deliberate. A confident-sounding wrong answer is worse than an honest range, and a tool that overstates its own precision is not doing you a favour.

What this site is not

Not medical advice. The health tools are educational. They do not diagnose, they do not account for your history or medication, and they should not be used to make decisions about treatment. Speak to a doctor or pharmacist.

Not financial advice. The money tools are arithmetic. They do not know your tax position, your circumstances or your risk tolerance, and they are not regulated advice. For debt in particular, free help from a charity such as StepChange or National Debtline is better than anything a calculator can offer.

Not a substitute for local rules. Building regulations, tax rates, drink guidelines and health advice all differ by country and change over time. Figures here are labelled with the jurisdiction they apply to, and you should check the current rules where you are.

Corrections

Mistakes get fixed, and they get fixed visibly. When an article or a tool is corrected in a way that changes its meaning or its output, the change date is shown on the page rather than the edit being made silently.

If you find an error, please tell us. Reports about a calculation being wrong are the most useful message this site receives, and they are acted on quickly. Include the numbers you entered and what you expected, and it will be reproduced and checked.

Independence and advertising

This site is funded by advertising. Advertisers have no involvement in what gets written, no advance sight of it, and no ability to change or remove it. Nothing here is a paid placement, no article is sponsored, and there are no affiliate links.

The tools do not upload what you type. Calculations run in your browser, and the site has no account system and no way to see the figures you enter. That is a design decision, and it is also why some features other sites offer, such as emailing yourself a result, do not exist here.

Review schedule

Tools show a "last reviewed" date. Articles that depend on figures which change, such as tax rates, interest rates, drink guidelines or public health advice, are rechecked at least annually, and sooner when the underlying guidance is revised.

If you are reading something with an old review date and the world has moved on, that is a fair thing to point out.