Investing

Compound Interest Calculator

Project how an investment may grow from starting money, monthly contributions, time, and return assumptions.

Before you calculate

What compounding interest means.

Compound interest means your money can earn a return, then that return can start earning a return too. Over long periods, the growth can become a larger share of the final value than the money you personally contributed. The exact path depends on time, contribution habits, fees, taxes, account type, and whether the return assumption is realistic.

Main assumptions

Inputs are editable and should be updated with your real income, rates, province, fees, or account limits. Calculations are simplified and may not include every tax credit, lender rule, fee, eligibility condition, or timing detail. Verify official numbers before acting. This tool is educational and is not financial, tax, legal, mortgage, or investment advice.

Basics

How compound interest works

Compound interest means returns can earn returns of their own over time.

Why starting early matters

More time gives compounding more years to work, even when monthly contributions are modest.

TFSA investing examples

A TFSA can shelter investment growth from tax, but contribution room rules still apply.

Frequently asked questions

Does this guarantee returns?+

No. Investment returns can be positive or negative.

Should I use inflation?+

You can lower the return assumption if you want a rough after-inflation projection.

Disclaimer

Estimate only. This tool is for informational purposes and does not replace professional financial, tax, legal, mortgage, or immigration advice. Always verify official figures before making decisions.

See also

Page details

Author: Canooq editorial team

Updated: May 28, 2026

Cite: Canooq.ca, Compound Interest Calculator