Compound interest calculator

See how compound growth can build over time from an initial deposit and regular contributions. You can also compare your main plan with an alternative strategy side by side.

Best for

Testing how steady contributions can grow over time
Comparing two savings habits on the same chart
Seeing how much of the ending balance comes from growth

Your strategy

Start with the same input shape MoneySmart uses, then compare it against an alternative savings plan.

Initial deposit

Regular deposit

Deposit frequency

Compound frequency

Number of years

Annual interest rate (% p.a.)

Alternative strategy

Model a delayed start, a different regular deposit, or a different compounding schedule.

Delay start (years)

Alternative regular deposit

Alternative compound frequency

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Results

Compare total savings, total regular deposits and interest earned across the two strategies.

Your effective annual yield 5.12 %

Alternative effective annual yield 5.12 %

Your strategy

$55,291

Initial deposit: $10,000
Regular deposits: $30,000
Total interest: $15,291

Alternative strategy

$55,291

Delay start: No delay
Regular deposits: $30,000
Total interest: $15,291

Difference in final savings +$0

Difference in interest earned +$0

Your strategy Year 10

Alternative Year 10

Your deposits $40,000

Your growth $15,291

Alternative deposits $40,000

Alternative growth $15,291

Year-by-year view

Final five years of the projection horizon

Year	Your strategy	Alternative strategy
6	$34,431 Deposits $18,000, interest $6,431	$34,431 Deposits $18,000, interest $6,431
7	$39,263 Deposits $21,000, interest $8,263	$39,263 Deposits $21,000, interest $8,263
8	$44,341 Deposits $24,000, interest $10,341	$44,341 Deposits $24,000, interest $10,341
9	$49,679 Deposits $27,000, interest $12,679	$49,679 Deposits $27,000, interest $12,679
10	$55,291 Deposits $30,000, interest $15,291	$55,291 Deposits $30,000, interest $15,291

How these estimates work

Annual interest rate is capped at 20% and the number of years is capped at 50.
Regular deposits are treated as end-of-period contributions.
Annual deposits force annual compounding.
The alternative strategy reuses the same interest rate and deposit frequency, but can delay the start and change the regular deposit and compound frequency.