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Expensico

Guides

Clear, accurate explanations of the ideas behind our tools — so you understand the result, not just get it. Each guide answers the questions people actually ask, shows the maths or the mechanics with a worked example, and links to the tool that does the job.

Money and personal finance

How loans, salaries and investments really work — with the formulas, worked examples in rupees, and the assumptions banks and employers don't always spell out.

Files, PDFs and images

Choosing the right format, making files smaller without ruining them, and understanding what happens to your documents when you use an online tool.

Developers and everyday work

Clear explanations of the formats and standards developers handle every day, written to be useful whether you're learning or debugging.

How our guides are written

Every guide is written to explain, not to sell. None is sponsored, and none recommends a particular bank, fund or product. We follow the same standards for each one:

  • Show the working. Formulas are written out and every worked example is calculated in full, so you can check the numbers yourself.
  • Use primary sources. Tax rates, contribution rates and limits come from official publications for the year stated in the guide.
  • Be clear about limits. Where real-world results can differ — rounding, fees, changing rates or market risk — the guide says so.
  • Keep them current. Guides show when they were published and last updated, and are revised when the rules or the tools change.

Spotted something out of date or unclear? Let us know and we'll check it. Looking for a topic we haven't covered? Suggest a guide.