Compound interest calculator
See what your savings can grow to over time with monthly contributions.
How it works
Interest is added to the balance every month and then earns interest itself. Monthly rate = annual rate / 12.
Results are for guidance only and do not replace professional advice.
Worked example
With the default values:
- Starting amount1000
- Monthly contribution100
- Annual return (%)5
- Years10
you get:
- Final balance€17,175.24
- Total contributed€13,000.00
- Interest earned€4,175.24
Frequently asked questions
How does the “Compound interest calculator” tool work?
Interest is added to the balance every month and then earns interest itself. Monthly rate = annual rate / 12.
What do I need to enter?
Just fill in: starting amount, monthly contribution, annual return, years. The result updates as you type.
Can you give an example?
Starting amount: 1000; Monthly contribution: 100; Annual return (%): 5; Years: 10 → Final balance: €17,175.24; Total contributed: €13,000.00.
Is this calculator free, and is my data private?
Yes. HOD Calc is completely free with no sign-up. The calculation runs in your browser: nothing you type is sent or stored.