Compound Interest Calculator
Model growth with contributions, compounding, and forecasts.
Runs 100% in your browser — nothing is uploaded
Estimate future account balance, total contributions, and interest earned with a compound-interest calculator. Adjust the principal, annual rate, compounding frequency, and recurring contributions to compare scenarios before investing or saving.
How to use compound interest calculator
- Open the tool and provide the text, number, date, or file it asks for.
- Choose the format, mode, or settings that match the result you need.
- Review the result in the preview or output area.
- Copy the answer or download the finished file when it looks right.
Frequently asked questions
What does compounding mean?
Compounding means interest is added to the balance and then future interest is calculated on the larger total. More frequent compounding can increase the final balance over time.
Does it include recurring deposits?
Yes — you can add monthly or annual contributions, choose when they fall in the period, and view the projected balance and interest earned.
Is it financial advice?
No. This is an educational estimate for planning and comparison. Actual returns can vary, and inflation or fees may change the real value over time.
How is the effective rate treated?
The tool shows the nominal annual percentage rate and the effective annual rate when compounding happens more than once a year, so the impact of frequency is explicit.
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