Last updated: 10/11/2026
Mission
To help anyone run their numbers and understand the result, with free, fast tools that explain themselves.
Independence
We are not paid to recommend products, banks or services, and we do not publish sponsored content without labeling it clearly.
Accuracy and sources
Every calculation is based on a verifiable formula or an official source, which we link. We always prefer primary sources: laws, government agencies and original studies. If a figure has no source, it is not published.
Clarity
We write for everyone, without unnecessary jargon. Every calculator includes the formula, a worked example and direct answers to the most common questions.
Tools and artificial intelligence
We use programming tools and artificial intelligence to build and maintain the site. Every formula, text and result is reviewed by a person before it is published, following our methodology.
Advertising
The site is funded by advertising. Ads are kept apart from the content, do not influence what we publish and never change the results.
Corrections
When we find an error or someone reports one, we fix it as soon as possible and log it on the corrections page. You can tell us from the contact page.