Free UK money calculators & plain-English guides

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Free calculators and straightforward guides to help you understand borrowing, saving, mortgages, debt and everyday finances. Everything runs in your browser — nothing you enter is sent to a server.

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Interest calculators and guides

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Everyday Money calculators and guides

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Plain English. We explain how each calculation works and the assumptions behind it, so you can trust the numbers.

No sign-up, no tracking of your figures. Calculations run entirely in your browser.

Evergreen and UK-focused. Built for everyday money questions, not daily market noise.