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Calculate savings interest


RateCity Staff

By RateCity Staff

3 min read

Saving money isn’t always an easy task. However, if you’re saving towards a goal, whether it be for a deposit on a home loan, a car or a holiday, a high interest savings account can help you to reach your goal sooner.

How interest is accrued

To calculate savings interest, you’ll first need to consider how often interest is calculated and paid in addition to the rate of interest paid.

Simple interest is interest paid on the original amount invested. The amount of simple interest on any principal is calculated by multiplying together the principal and rate of interest by the amount of time you save in an account. 

For example, if you deposit $1,000 into an account paying a rate of 2 percent, 12 months later you would have accrued $20 interest so long as you didn’t make any withdrawals from the account.

Compound interest, on the other hand, is described as ‘interest on interest’.

That’s because the more frequently the interest is paid and reinvested into an account, the greater the final return.

Either way, if you are serious about saving, the interest you earn can really add up, particularly if you make regular deposits to the account.

For example, if you put an initial $2,000 into a savings account at a rate of 5 percent and deposit $400 each month you could have $17,424 saved within three years, so long as you don’t make any withdrawals. A total of $1,424 of that amount would be interest you have earned.

What you need to know

To work out how long it will take to reach your savings goal, use RateCity’s savings account calculator.

To calculate savings interest you’ll need to know how much you will be starting with, how much will be put into the account each month and what interest rate you will be offered. Having a goal will help too!

For example, if you want to save at least $10,000 within three years and you’re starting from scratch, then you’ll need to deposit around $300 per month into a savings account paying 5 percent interest p.a. At the end of the period you’ll have more than reached your goal with $11,326 banked (minus any fees and charges and tax) so long as you don’t withdraw money.

Refer to our savings accounts guide for up-to-date information and the table to the right for a list of some of today’s best online savings accounts.

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