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Compound Interest Calculator Canada
Project Canadian savings or investment growth from a starting balance, recurring contributions, time horizon, return, and compounding frequency.
Basics
What is compound interest?
Project how an investment may grow from starting money, monthly contributions, time, and return assumptions. The calculator grows the starting balance at the selected rate, adds recurring contributions, and repeats that process for each compounding period through the time horizon. It separates total money contributed from growth so the source of the final value stays visible.
With the values entered, the calculator estimates projected ending balance of $116,322. This scenario uses initial investment of $5,000, monthly contribution of $250, interest or return rate of 5%, and time horizon of 20 years. The supporting results show total contributions of $65,000 and total growth earned of $51,322, which makes the main drivers easier to compare. Compound growth rewards time, consistency, and realistic return assumptions. Compare projected final value with total contributions and total growth. The result is most useful for deciding how much time and monthly saving you need; treat the return rate as a scenario, not a promise, especially when the money is needed soon.
Formula or decision method
Compound-balance formula
For each monthly period, the calculator uses: next balance = current balance × (1 + annual return ÷ 12) + monthly contribution. Principal is the starting $5,000. The contribution is added after each month's growth. The nominal return does not remove inflation, tax, or investment fees.
Data provenance
Use your latest account statement for the starting balance and a scheduled transfer you can sustain for the monthly contribution. The return is a user-selected scenario, not a Canooq forecast. The growth formula is account-neutral, but tax treatment is not: TFSA growth and withdrawals are generally tax-free, RRSP contributions may reduce taxable income and withdrawals are generally taxable, qualifying FHSA contributions may be deductible and qualifying home withdrawals tax-free, while non-registered investment income and gains may be taxable.
Sensitivity test
| Input | Calculated result |
|---|---|
| 4% annual return | $102,807 |
| 5% annual return | $116,322 |
| 6% annual return | $132,061 |
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.
What if I miss contributions sometimes?
Use a lower monthly contribution or run a second case with skipped months. A repeatable amount beats a perfect amount you cannot keep.
What if the money is needed soon?
Use a safer return assumption for short timelines. Money needed soon usually should not depend on stock-market growth.
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.
Disclaimer
Compound growth depends on contribution timing, fees, taxes, account type, and whether the return assumption holds. Use this estimate to compare savings habits, then verify rates and product terms before investing.
See also
- All calculators
- All templates
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- FIRE Calculator — Enter what you earn, what you spend, and what you have invested to see the earliest age you can retire in Canada and the annual spending your money supports for life, with CPP, OAS, RRSP, TFSA, and income tax included.
- Resignation Letter
- Resume Builder
- Retirement Calculator — See how much money a month you would have if you stopped working at a given age, split into savings, CPP, OAS, and pension, with the CPP-at-60-65-70 trade-off costed out.
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Page details
Author: Thomas Tremblay
Updated: August 6, 2026
Cite: Canooq.ca, Compound Interest Calculator
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