Compound Interest Calculator
MathCalculate compound interest with regular monthly contributions, adjustable compounding frequency and final amount, total principal and effective return rate.
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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.
How to Use
- Open the Compound Interest Calculator tool
- Enter the values to calculate
- Adjust the output options as needed
- Click the Calculate button; results appear in real time
- Copy or export the result
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.