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Everyday Calculators

Five calculators that show the formula behind the answer rather than just the number, so you can check the working yourself. Nothing you type is logged or sent anywhere.

5 tools · all free · nothing uploaded

About these calculators

Everyday arithmetic that is easy to get subtly wrong: how many days old you are, what a percentage change actually is, what a loan really costs, how a stacked discount compounds, and how a tax-inclusive price breaks down.

Each calculator here shows the formula it used, not just the answer. That is deliberate. A percentage change calculated against the wrong baseline, or an EMI computed with a monthly rather than annual rate, produces a plausible number that is simply incorrect, and being able to see the working is what lets you catch it.

The EMI calculator produces a full amortization schedule showing how each instalment splits between interest and principal, which is usually the point people are actually trying to understand: how much of the early payments is interest. The GST calculator splits tax into CGST and SGST for intra-state supplies or a single IGST figure for inter-state ones.

None of these tools stores what you type. Financial figures and dates of birth are among the more sensitive things people enter into a website, and there is no reason for a calculator to remember any of it.

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