Compound Interest Calculator
Project how an investment grows over time with compound interest and optional regular contributions.
Assumes a constant rate of return, which real investments don't provide — this is a projection tool, not a guarantee or financial advice.
Overview
See how a starting amount, combined with regular contributions and compound interest, could grow over time — a useful way to understand the long-term effect of consistent saving.
- Optional monthly contributions on top of a starting balance
- Choice of compounding frequency
- Breaks down total contributed versus interest earned
How to use it
- 1Enter a starting amount and optional monthly contribution
- 2Enter the expected annual rate and number of years
- 3Read the projected balance and interest earned
Frequently asked questions
What compounding frequency should I choose?
This depends on the account or investment — many savings accounts compound daily or monthly, while some investment projections use annual compounding. Check your specific account's terms if precision matters.
Does this account for taxes or fees?
No — it's a pure mathematical projection assuming a constant rate of return, before taxes, fees, or inflation. Real returns vary and are never guaranteed.