Disclaimer

General

Everything on BestCalculators is provided for general information and education. It is not professional advice and no professional relationship is created by using it. We publish the formula on each page precisely so you can check our working rather than take it on trust.

Results are only as good as the inputs and the assumptions. If a number here will shape a decision with real consequences, treat it as a first estimate and verify it with someone qualified in your jurisdiction.

Financial and tax calculators

Loan, mortgage, retirement, salary and tax tools use standard formulas and generic assumptions. They do not know your tax residency, your credit terms, your lender's rounding conventions, fees, insurance requirements, or any rule specific to your country or state.

Nothing here is financial, investment or tax advice, and no result should be read as a recommendation to borrow, invest, or make any transaction. Speak to a licensed adviser or accountant before acting.

Health, fitness and pregnancy calculators

Body composition, calorie, pace, pregnancy and cycle tools apply population-level formulas. They cannot account for your medical history, medication, body composition, or any condition. A BMI or body-fat estimate is a rough statistical marker, not a diagnosis. A due date or ovulation estimate is an average, and real cycles vary widely.

These tools are not medical advice and are not a substitute for a doctor, midwife or dietitian. Never delay seeking medical care because of something you read here. If you think you are having a medical emergency, contact your local emergency service.

Construction and material calculators

Gravel, concrete, roofing, tile and similar tools estimate quantities from the dimensions you enter and from typical material densities. Real densities vary by supplier and region, ground conditions change how much material a site absorbs, and none of these tools performs a structural calculation.

Do not use these results for structural, load-bearing or safety-critical work. Confirm quantities with your supplier and any structural question with a qualified engineer or building professional. Local building codes always take precedence.

Legal and deadline calculators

Date and deadline tools count calendar days on the Gregorian calendar. Business-day figures exclude Saturdays and Sundays but not public holidays, which differ by country and often by region.

Do not rely on a date from this site for a court filing, a statutory notice period, or any legal deadline. Rules on how deadlines are counted — whether the first day counts, what happens when a deadline falls on a weekend — vary by jurisdiction. Check with a lawyer or the relevant court.

Accuracy and errors

We test the maths behind these tools and correct mistakes when we find them, but we do not warrant that every result is free of error. If you spot something wrong, please tell us through the contact page — corrections are welcome and we act on them.

External links and advertising

Links to outside sources are provided for reference and are not endorsements. Advertising is supplied by third parties; we do not control or vouch for what appears or what it leads to.

Contact

Questions or corrections: hello@bestcalculators.org. See also our Terms of Service.