TabBench
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Free online calculators for finance and everyday maths

Most everyday financial maths goes wrong in predictable ways: subtracting a percentage from a tax-inclusive total, adding two discounts together, or comparing loans by monthly instalment rather than total interest. Each calculator here shows the formula alongside the result, so you can check the reasoning rather than take the number on trust.

Every calculation runs in your browser. Nothing you enter — salary figures, loan amounts, invoice values — is transmitted or stored anywhere, which is worth knowing given how much personal financial information typical online calculators collect.

Calculators & Finance tools

Frequently Asked Questions

Are these calculators free to use?

Yes, entirely. There is no signup, no usage limit, and no paid tier. The calculations run in your browser, so there is no server cost to recover.

Why do my results differ from another calculator?

Almost always because of a different convention rather than an arithmetic error — whether a percentage is applied before or after tax, whether a period is counted inclusively, or how rounding is handled. Each calculator here shows its formula so you can see exactly which convention is in use.

Is my financial data stored?

No. Every figure you enter stays in your browser's memory and is discarded when you close the tab. Nothing is transmitted, logged, or associated with you.

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