Who writes and maintains these tools?

inyourbrowser.com is run as a small, independent project rather than under personal bylines. Accountability sits with the site itself: every tool names the formula and source it uses, and there is a single public process for reporting and fixing errors, described below.

How often is the content reviewed?

Content was last reviewed on May 26, 2026. We re-review a tool when it changes and when a reader reports something that looks wrong. We do not claim a fixed update schedule we cannot keep.

How do I report an error?

Email us with the tool, the inputs you used, and the result you expected. We verify the report against the primary source, correct the tool if it is wrong, and update the reviewed date on the affected pages.

/ EDITORIAL STANDARDS

How we build and check these tools

You do not have to trust our numbers. This page explains how each tool is built, which formula it uses, where that formula comes from, and how to tell us if something is wrong. It is the content-accuracy companion to our privacy verification page.

How the tools are built

Every tool is a JavaScript program that runs in your browser using browser-native APIs. The logic is the same code that produces your result, and the formula behind each calculator is stated in plain sight in that tool’s “Technical specification” section. Nothing is computed on a hidden server, so the same inputs always produce the same output on any device.

How we choose and cite sources

We implement published, well-established formulas rather than inventing our own. Where a tool rests on a specific standard or paper, that source is named on the tool’s page: the World Health Organization ranges for BMI, the Mifflin-St Jeor equation for calorie needs, the Boer formula for lean body mass, the US Navy circumference method for body fat, and the standard amortization formula for loans and mortgages. We do not invent thresholds or categories; when a field has competing formulas, we say which one a tool uses.

How we verify accuracy

Each tool is implemented from the primary definition of its formula and then cross-checked against worked examples and published reference values. Deterministic tools — hashes, encoders, converters — are checked against known test vectors, where the correct output is fixed and public, so a single wrong character is easy to catch. When a formula has a known margin of error against a gold-standard measurement, we state that margin on the tool’s page rather than implying false precision.

Review cadence

Content was last reviewed on May 26, 2026. We re-review a tool when it changes and when a reader tells us something looks off. We deliberately do not claim a daily or weekly update schedule we could not honestly keep; the reviewed date you see on a page is the real date that page was last checked.

Limitations and disclaimers

The calculators here produce estimates, not professional advice. Health tools implement population-level formulas that cannot replace clinical assessment, and financial tools model standard arithmetic that cannot account for your full circumstances. Where a result carries that kind of weight, the tool says so directly. Treat every output as a starting point for a decision, not the decision itself.

Corrections policy

If you find an error — a wrong result, an outdated threshold, a miscited source — tell us. Email contact with the tool, the exact inputs you used, and the result you expected.

Here is what happens next:

We reproduce the issue and check it against the tool’s primary source.
If the tool is wrong, we fix it and verify the corrected output against reference values.
We update the “last reviewed” date on the pages the change affects.

We cannot promise a response time, but corrections to factual errors are the highest priority for this kind of site, and we treat them that way.

Frequently asked questions

Who writes and maintains these tools?: inyourbrowser.com is run as a small, independent project rather than under personal bylines. Accountability sits with the site itself: every tool names the formula and source it uses, and there is a single public process for reporting and fixing errors, described below.
How do you verify a tool is accurate?: Each tool is implemented directly from the primary definition of its formula, then cross-checked against worked examples and published reference values. Deterministic tools such as hashes and encoders are checked against known test vectors, where the correct output is fixed and public.
How often is the content reviewed?: Content was last reviewed on May 26, 2026. We re-review a tool when it changes and when a reader reports something that looks wrong. We do not claim a fixed update schedule we cannot keep.
How do I report an error?: Email us with the tool, the inputs you used, and the result you expected. We verify the report against the primary source, correct the tool if it is wrong, and update the reviewed date on the affected pages.

Reviewed and tested May 26, 2026.