Financial calculators for the questions you actually have

Put in what you invest each month and the return you expect, and see what the SIP is worth at the end — split into the money you actually paid in and the growth on top.

One amount, invested once, left to compound. See what it becomes and how much of that is growth rather than your own money.

A SIP that grows with your income. Raise the instalment a little every year and see what the difference compounds into over the full term.

Draw a monthly income from a corpus while the rest stays invested. See what is left each year — and whether it lasts.

The single annual rate that would have taken you from where you started to where you ended. The fairest one-number summary of an investment's performance.

What a fixed deposit is worth at maturity, compounded quarterly the way banks actually post it.

A fixed amount every month into a deposit that pays a contractual rate. See what it matures to and how much of that is interest.

A yearly contribution to a Public Provident Fund account, compounded annually for the full term. See what the account is worth at maturity.

Interest on the interest. Choose how often it compounds and see what the difference is worth over the term.

Interest on the original amount only, never on the interest. The formula every school textbook starts with — and a few real products still use.

Home, car and personal loan EMI on the reducing balance, with every instalment of the schedule.

Add GST to a price, or work backwards from a price that already includes it. Both directions, with the CGST and SGST split.

What today's rupee is worth later, and what today's expense costs later. The same arithmetic, pointed in both directions.