We build free calculators for everyday money questions, each with a worked example and a plain explanation of how the result is reached. Every calculator and text is reviewed by Ertzil, CuentaFina's editorial signature, against official sources and simulators before publication and whenever the rules change. We use AI tools to help write code and text; no figure is published without checking it against the official source and test cases (see our methodology).
We have no ties to banks, insurers or public bodies. The site is free and will be funded by advertising placed in reserved spaces that never cover a calculator or its result. Whatever you type into a calculator stays in your browser.
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