How to use the Compound Interest Calculator
Fill in the fields on the left. Results, charts and the breakdown update instantly as you type or move a slider. Pick your country at the top of the page to switch currency.
Formula
A = P × (1 + r/n)^(n·t) + monthly contributions compounded at the same rate
Frequently asked questions
How often should interest compound?
More frequent compounding earns slightly more. Daily vs monthly makes a small difference; the rate and time matter far more.
What is the effective annual rate?
The actual yearly growth after compounding, e.g. 12% compounded monthly is 12.68% per year.
Results are estimates for information only and are not financial, tax or legal advice. Tax rules, interest rates and fees change, so confirm important numbers with your bank, employer or a qualified adviser. Read our disclaimer.