Editorial standards
We build calculators people can actually use. Each one comes with plain-language help, a worked example, notes on how the math works, useful background, answers to common questions, and links to trusted sources — written for readers, not churned out as filler.
What you'll find on every calculator
- A working tool you can use in the browser — not just an article
- The formula explained in everyday language, with the math shown clearly
- A step-by-step example with realistic numbers
- Notes on how the calculation works, where it has limits, and what it does not cover
- A handful of useful facts — never padding
- Answers to questions people really ask
- Links to trusted sources such as health agencies, standards bodies, and peer-reviewed research
- Suggestions for related calculators
- A clear disclaimer when the topic involves health or money
- When the page was last checked, and who checked it
Written for your language — not machine-translated
Spanish pages are written for Spanish readers, German for German readers, and so on. Units, currency, number formats, examples, and references follow local habits and institutions. We do not run English through a translator and hit publish. When we improve an English page first, other languages get a proper rewrite of their own.
Before we publish
Every language version has to earn its place. We check that:
- The calculator works correctly in the browser
- Facts and examples feel local — not a copy of another language with names swapped
- Common questions match what people in that language actually ask
- The explanation matches the formula the tool uses
- Sources are real, linked, and right for the topic
- The writing is original for that page — we do not recycle the same answers across similar tools
How often we review
- Finance and tax tools — every year (usually in January)
- Health tools — every two years
- Math and everyday tools — every three years, or sooner if the formula changes
- Weather tools — whenever official guidance changes
When a country needs its own page
Some topics — tax brackets, mortgages, and similar — differ by country. We only publish a country-specific version when the content truly reflects those local rules. A different web address alone is not enough.