100,543.3470,000.0030,543.3443.63%About Compound Interest Calculator
Compound interest is what Einstein allegedly called the "eighth wonder of the world" — interest is reinvested into principal and keeps earning, and the longer the horizon and the more frequent the compounding, the bigger the snowball. This tool computes the final amount via A = P(1+r/n)^(nt), supports monthly contributions (added to principal each month before compounding), and lets you set the annual rate, compounding frequency (yearly/quarterly/monthly/daily) and term, while showing total principal, total interest and return rate. Great for retirement, dollar-cost averaging and savings goals. All math runs locally. Tip: Bookmark this tool for quick access whenever you need mathematical calculations. All computation happens locally in your browser with instant results.
Use Cases
- DCA projection — Enter a monthly contribution and expected annual rate to see the balance and interest share in ten years.
- Savings reverse check — Tweak principal and rate to see whether your current pace hits a target amount on time.
- Loan compounding compare — Compare daily vs yearly compounding to grasp the real cost gap.
- Education fund — Simulate a monthly education fund accumulating over years and quantify long-term compounding.
- Inflation hedge — Subtract inflation from the expected return to estimate real purchasing-power growth.
- Mortgage comparison — Compare total interest paid at different compounding frequencies to understand the true cost of a loan.
- Crypto staking estimate — Estimate growth of a staked token amount with daily compounding to project returns over a lock period.
FAQ
How are monthly contributions handled?
They are added to principal each month and then compounded at the chosen frequency, closely matching real dollar-cost averaging.
Which compounding frequency is most accurate?
Higher frequency compounds more; daily compounding best matches bank wealth products and money-market funds.
Should I enter nominal or real rate?
Enter the nominal annual rate; the tool converts it to a periodic rate automatically. Adjust for inflation yourself if needed.
Can it model losses?
Yes. Enter a negative annual rate to simulate a loss; the return rate will show negative.
Are fees included?
No. This is a pure compound-interest model without purchase, management or redemption fees, so real returns will be slightly lower.
Any browser compatibility requirements?
This tool works in all modern browsers (Chrome, Firefox, Edge, Safari). No plugins or extensions required.
Can I use it offline?
After initial load, most features work offline. The core logic runs entirely in your browser with no network dependency.