Calculators that show their working

See the full month-by-month breakdown of any loan — what you pay, what goes to interest, and what you still owe.

See exactly how much interest an extra monthly payment saves, and how many years it takes off your mortgage.

Compare paying half your mortgage every two weeks against paying monthly, and see what the switch actually saves.

See how long your card takes to clear on minimum payments versus a fixed amount, and what the difference costs you.

See what paying extra on your car loan saves in interest, and how much sooner you own the car outright.

Project savings or investments year by year, separating what you contribute from what compounding adds.