Saving and Investing Calculators
Compare compound and simple interest on one starting balance, or plan regular savings towards a Christmas budget.
Use compound interest when returns are added to the balance and simple interest when interest is calculated only on the original principal. The interest tools do not model contributions, fees, tax, inflation or variable returns, and the Christmas plan assumes even savings with no interest, so treat each result as a planning scenario rather than a forecast.
How to use these calculators well
- Run conservative, middle and higher-return scenarios rather than one forecast.
- Include fees, tax and inflation where they materially affect the goal.
- Match the risk and access assumptions to the product being considered.
Compound Interest Calculator
Calculate compound interest on one starting balance using an entered rate, term and compounding frequency. See projected growth and total interest.
Open calculatorSimple Interest Calculator
Calculate simple interest on a deposit or loan from the principal, annual rate and term. See total interest and final balance instantly for free.
Open calculatorChristmas Savings Plan Calculator
Work out how much to save each week or fortnight to cover your Christmas budget for gifts, food and travel before the big day.
Open calculatorRelated Australian guides
Go beyond the result and review the assumptions, source material and decision checks that matter for this category.