Editorial Policy

freeusukcalculator.com publishes free calculators and plain-English guides for everyday financial, health, math, and lifestyle decisions in the USA and UK. This page explains how we build our tools, where our numbers come from, how we keep them current, and how to tell us when something looks wrong.

Our Mission

To give people fast, accurate, free estimates without sign-ups, paywalls, or data harvesting. Every calculator runs in your browser — your inputs are not sent to a server or stored.

How We Build Each Calculator

• Formula first. Each tool is built around a published, verifiable formula or official rate table — for example, the Mifflin-St Jeor equation for BMR, the standard amortization formula for loans, or HMRC/IRS bands for tax tools.
• Tested against worked examples. We check each calculator's output against hand-worked examples and, where possible, official reference figures before publishing.
• Documented on the page. Most tools show the formula, a worked example, and the assumptions used, so you can see exactly how the result was produced.

Sources We Use

For money, tax, and health tools we rely on primary, authoritative sources, including:

• USA: IRS, the Social Security Administration, the Federal Reserve, HUD/FHA, and the CDC.
• UK: GOV.UK, HMRC, the Welsh Revenue Authority, Revenue Scotland, the NHS, MoneyHelper, and the Bank of England.

Relevant official sources are linked directly on each tool that needs them, so you can verify the underlying rules yourself.

Accuracy & the "Estimate Only" Principle

Our calculators produce estimates for general guidance. They cannot account for every personal circumstance — reliefs, allowances, regional variations, individual medical factors, or recent rule changes. For finance, tax, mortgage, salary, retirement, and health tools especially, you should treat the result as a starting point and confirm important decisions with an official source or a qualified professional (an accountant, mortgage adviser, solicitor, or healthcare provider).

Keeping Content Current (2026)

• Tax-year figures (tax bands, contribution limits, allowances) are reviewed when governments publish changes — typically at the US tax year and the UK Budget / new tax year in April.
• Each tool shows a "Last updated" date so you know how fresh the figures are.
• When official rates change, we update the affected calculators and note the new tax year.

Authorship & Review

Content is produced and reviewed by the freeusukcalculator.com editorial team. Money and health tools — the areas where accuracy matters most — get extra scrutiny against official sources before and after publication.

Corrections Policy

We want every number on the site to be right. If you spot an error in a formula, rate, or example, please tell us via our contact page with the page name and what looks wrong. We review reports promptly, fix confirmed errors as quickly as we can, and update the page's "Last updated" date when we do.

Advertising & Independence

The site may display advertising to keep the tools free. Advertising never influences the formulas, figures, or recommendations in our calculators or guides. Ads are clearly distinguishable from editorial content.

Privacy

Calculators process your inputs locally in your browser. We do not require accounts and do not sell personal data. See our Privacy Policy for full details.

Last updated: 12 June 2026.

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