Disclaimer

What a calculator here can do

It can apply a documented formula accurately and show you the working. Each calculator names the formula it uses and, where one exists, the standard or study it comes from, so you can check it rather than take our word for it.

What it cannot do

It cannot know your circumstances. A mortgage calculator does not know your credit file, a tax calculator does not know your allowances, and a body fat estimate does not know your build. The formula is general; you are not. Two people with identical inputs can face completely different real answers, and no calculator on any site can see that difference.

Money

Nothing on this site is financial advice, an offer of credit, or a quotation. Loan payments, tax figures, investment projections and retirement estimates are illustrations. Real lending depends on underwriting, real tax depends on your full position, and real investment returns are unknown in advance. Consult a qualified adviser, and rely on the figures in an actual offer rather than the ones here.

Some calculators carry live reference data, such as exchange rates and published average mortgage rates. That data comes from third parties, may lag, and falls back to stored values when the source is unavailable. Treat it as indicative.

Health

The health calculators are educational and are not medical advice, diagnosis or treatment. BMI, body fat, calorie needs, pregnancy dates and kidney function estimates are population formulas fitted to study groups, and they behave badly at the edges of those groups. A result outside a normal range is a reason to speak to a clinician, not a conclusion.

If you have a medical concern, contact a professional. In an emergency, call your local emergency number rather than reading a web page.

Building and materials

Concrete, roofing, tile, stair and electrical calculators estimate quantities from the dimensions you supply. They do not account for waste on site, local building codes, structural requirements or safety rules. Have a qualified trade or engineer check anything that will be built, and follow the code that applies where you are.

Accuracy, and reporting a problem

We check results against published examples where they exist, and correct errors when we find them. We still cannot promise that every figure is right, and we accept no liability for decisions taken on the basis of one. The terms of use set out the limits in full.

If a calculator looks wrong, tell us at info.calculatorcastle@gmail.com with the inputs you used and the figure you expected. A specific report gets a fast fix, and corrections to Calculator Castle are worth more to us than being told everything is fine.