Compound Interest Calculator
Estimate how a starting balance and regular monthly deposits may grow when returns compound over time. Adjust the assumptions to compare scenarios.
Enter your assumptions
Change any value to update the estimate immediately.
Model: The entered effective annual return is converted to an equivalent monthly rate. Deposits are made at the end of each month and earn no growth during that month.
Illustrative estimate
Projected balance
After 10 years
CA$32,501.53
Total deposited
CA$25,000.00
Starting balance plus monthly deposits.
Estimated growth
CA$7,501.53
Balance minus deposits; can be negative.
Excludes taxes, fees, inflation and changing returns. Actual results vary.
What this estimate includes
The calculator applies an equivalent monthly growth rate to the balance, then adds each monthly deposit at month end. It separates your total deposits from hypothetical growth so you can see how much of the result comes from your contributions.
For example, use a starting balance of 1,000, add 200 monthly, enter a hypothetical 5% annual return and choose 10 years. The result is a scenario only; it does not predict market performance. It excludes investment fees, taxes and inflation. Compound growth means returns can be earned on both the original balance and earlier returns; see Investor.gov's compound interest calculator for another planning reference.
Want to see a worked example? Read the compound interest calculator guide →