Editorial Policy

Numivo aims to give clear answers you can check. This page explains how calculators and their pages are made, and how we handle mistakes.

Who makes Numivo

Numivo is made by the Numivo team. Every formula is checked by automated tests, as described below, before a calculator is published.

How a calculator is built

• The calculation lives in its own piece of code, separate from the page, so it can be tested on its own.
• Automated tests compare its results with values worked out independently, and try normal, boundary and invalid input, such as zero, negative or very large numbers.
• Money is calculated in whole cents, and rounding is stated on the page.
• Unit conversions use exact published definitions, such as 1 inch = 2.54 centimetres and 1 pound = 0.45359237 kilograms.
• Each page shows the formula, a worked example and the steps behind your result, so you can follow and check the number.

No invented figures

When a result depends on a figure that varies, such as a material density, the coverage of a product, a tax rate or a benchmark, the calculator asks you for it instead of hiding a default. Example values are labelled as examples. We do not publish made-up statistics, reviews, testimonials or expert credentials.

Limitations are stated

Every calculator page has a section on its assumptions and limitations. Health calculators carry a visible note that they are not medical advice. See the Disclaimer for more.

Independence

Numivo does not currently show advertising, and no one pays to have a calculator included, ranked or worded in a particular way. If advertising is added in future, it will be kept separate from calculators and results, and the Privacy Policy will be updated first.

Corrections

If you find a mistake, please email numora.help@gmail.com with the page, the numbers you entered and what you expected. We check every report; when a calculation or explanation is wrong, we fix it, add a test for the case and update the page.