Compound Interest Calculator
Compound interest means earning interest on your interest. This calculator projects a balance forward over a number of years and shows how much of the final figure is your original money and how much is growth.
Free, no signupRuns entirely in your browser
Input
Result
- Future Value (Total)
- $22196.40
- Total Interest Earned
- $12196.40
- Initial Principal
- $10000.00
- Yearly Projection
- Year 1: $10830.00 Year 2: $11728.88 Year 3: $12702.37 Year 4: $13756.66 Year 5: $14898.46 Year 6: $16135.02 Year 7: $17474.22 Year 8: $18924.57 Year 9: $20495.30 Year 10: $22196.40
About
What the Compound Interest Calculator does
The effect is unintuitive because it is exponential, not linear. Money doubles roughly every 72 divided by the interest rate in years — at 6%, about twelve years. The bulk of the growth happens late, which is why starting date matters more than contribution size over long horizons.
How it works
Using the Compound Interest Calculator
- 1Enter the starting principal.
- 2Enter the annual interest rate.
- 3Enter the number of years to project.
- 4The balance is compounded forward across the period.
- 5The final balance and the total interest earned are shown.
Use cases
What people use it for
- Projecting savings or pension growth
- Comparing two savings rates over a long period
- Seeing the cost of delaying investment by a few years
- Understanding how a debt grows if left unpaid
FAQ
Frequently asked questions
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