Compound Interest Calculator
Project deposits, compounding and inflation-adjusted growth.
How this calculator works
Monthly equivalent rate = (1 + nominal annual rate / m)^(m / 12) − 1, where m is the annual compounding frequency.
Calculation assumptions
Returns are hypothetical and constant; monthly contributions are added at the beginning or end of each month. Fees and taxes are excluded.
Example
At 0% return, $10,000 initially plus $250 each month for 10 years gives $40,000.
For planning only. Not financial advice or a lender quote.
Frequently asked questions
Are my financial numbers stored or sent to your server?
No. Inputs remain in browser memory. Only language, currency, theme and recently used calculator IDs may be saved on this device. Exports are created locally.
Why can a lender’s quote differ?
Our calculations use the assumptions shown here. A lender may apply different dates, daily interest, fees, taxes, insurance or rounding.
Can I select a different currency?
Yes. Currency selection changes only the symbols and number formatting; no exchange-rate conversion occurs.