Our Methodology & Editorial Standards

Every calculator on TG we-Calculate is built to give you a trustworthy answer. This page explains how we create, source, review and maintain our tools, and how to tell us when something looks wrong.

How we build each calculator

Each tool implements a documented, industry-standard formula — for example Naegele’s rule for due dates, the Mifflin–St Jeor equation for energy expenditure, and standard amortization mathematics for loans. We show the formula on the page, test each calculator against worked examples and reference values, and prefer widely accepted methods over proprietary ones so results are reproducible and verifiable.

Sources & references

Where a calculator relies on external standards or data, we cite authoritative primary sources (such as health authorities, standards bodies and official statistics) in a “Sources & references” section on the page. Currency and similar live data come from reputable providers and are clearly attributed.

Review & updates

Calculators are reviewed by the TG we-Calculate editorial team for correctness and clarity, and each page shows a “Last updated” date reflecting its most recent review. We revisit tools when underlying formulas, guidelines or data change.

Accuracy, limitations & corrections

Results are estimates and may be simplified or generalised; they are not professional advice — see our Disclaimer. We work hard to be accurate, but if you believe a result is wrong, please tell us via the feedback control on the calculator or our contact page, including the inputs you used, and we will investigate and correct it promptly.

Independence

Our calculators are free to use. Advertising never influences a calculation or a result — the maths is the same for everyone.