Simple vs Compound Calculator
Simple vs Compound Interest Calculator
Compare how much extra growth compound interest may produce versus simple interest over the same time period.
Outputs
Results
Enter your numbers and click calculate.
Year-by-year table
A yearly summary of balance, contributions and interest.
| Year | Deposits | Withdrawals | Interest | Tax / fees | End balance |
|---|
What if I start 5 years earlier?
Calculate to see the comparison.
Simple vs compound interest
Calculate to see the comparison.
Excel formula
Copy a formula based on your current inputs.
=FV(...)Growth chart
Visualise how your balance builds from the starting amount plus accrued interest.
Month-by-month table
Click a year to expand the monthly breakdown.
Guide
How this calculator works
Simple interest is calculated only on the original amount. Compound interest adds earned interest back into the balance, so the next period earns interest on a larger amount. The results panel includes a simple versus compound comparison automatically.
You can still change every input: currency, interest rate, years and months, compounding frequency, contribution timing, inflation and tax or fees. Use the share URL button to save a pre-filled version of the result.
FAQ