Standards
Editorial policy
Last updated September 24, 2026
Money decisions deserve numbers you can trust. This is how we earn that trust.
How a calculator is built
- Start from a real question people ask, in their own words.
- Use official or primary data: the U.S. Bureau of Labor Statistics, the World Bank, the European Central Bank, the IRS and similar sources. Every page lists its sources.
- Write the formula down on the page, so anyone can check the working.
- Test against worked examples. The worked example on each page is calculated by the same code as the calculator, so the two can't drift apart.
- Review before publishing. The Dollars World team reviews each calculator and its explanation before it goes live.
Keeping it current
Data-driven calculators are refreshed when their source publishes new data, and each page shows the date it was last reviewed. When tax rules, limits or official figures change, we update the affected pages.
Corrections
If you find an error, tell us. We check every report, fix confirmed mistakes promptly, and note significant corrections on the page.
Partner offers and advertising
- Partner offers are labelled "Sponsored" and sit outside the calculator.
- No partner can change a calculator's formula, inputs, results or explanation.
- We only show an offer next to a calculator it's relevant to.
Use of AI
We may use software, including AI tools, to help draft or check code and text. A person reviews everything before it's published, and every number comes from a calculation or a cited source, never from an AI's memory.
Not advice
Our calculators and articles are general information. They don't know your full situation. For decisions with big consequences, talk to a qualified professional.