Compound Interest Calculator

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

1. Open the Compound Interest Calculator tool page
2. Enter or paste your data into the input area
3. View the real-time results and use the copy button to get the output

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