Finance
Compound Interest Calculator
Estimate future value and interest earned with compound interest.
Compound Interest Calculator
Result
Ready
Guide
Compound Interest Calculator basics
Estimate how a balance grows when interest is added back over time.
Formula
How the calculation works
Future value
P x (1 + r/n)^(n x t)Interest earned
Future value - PrincipalExample
Example calculation
$1,000 at 5% for 10 years
$1,647.01 with monthly compounding
Notes
Assumptions
- Rate is entered as an annual percentage.
- Taxes, fees, inflation, and deposits are not included.
FAQ
Compound Interest Calculator FAQ
What is the Compound Interest Calculator for?
It uses the fields on this page and applies the formula shown below the result. Check the assumptions before using the number outside the page.
Can I use decimals?
Yes. Decimal inputs are supported unless the field represents a count.
How should I use the result?
Treat it as a calculator result, not a full plan. Round it or adjust it when the real situation calls for it.
Sources. Standard compound interest formula.
Disclaimer. Use this result as a check or starting point. For finance, health, engineering, or purchasing decisions, verify the numbers before acting on them.