About the compound interest calculator
Compound interest means you earn interest on your interest. Over long periods the effect is dramatic, which is why starting early matters so much. Enter your starting amount, rate and time to see the final value and the interest earned.
Formula used
A = P × (1 + r/n)^(n×t)
How to use
Fill in the fields above and the results update instantly. Change any value to compare scenarios. Results are estimates for planning and education and may differ from figures provided by banks, tax offices or doctors.
Frequently asked questions
What is the difference from simple interest?
Simple interest is only on the principal; compound interest is also on previously earned interest.
Which compounding frequency is best?
More frequent compounding gives slightly higher returns, but the rate matters far more.