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Compound Interest Calculator Canada 2026 (Free Tool)
Free Canadian compound interest calculator. See how monthly contributions grow over time. Includes TFSA/RRSP-aware compounding and Rule of 72 doubling time.
Interactive calculator
The Canadian compound interest calculator
See exactly how compound growth turns small contributions into real wealth. Updates as you type.
Final balance
$0
Total contributed
$0
Compound growth
$0
Money doubles every
0 years (Rule of 72)
How to use this calculator
The compound interest calculator above projects how your investments grow over time based on:
- Starting amount — your current balance
- Monthly contribution — what you’ll add each month
- Years — your time horizon
- Annual return — expected rate of return on your investments
- Compounding frequency — how often interest is added back to the principal
The “doubling time” output uses the Rule of 72 — divide 72 by your annual return percentage to estimate how many years your money takes to double.
Why compound interest matters more than amount
A common mistake: people focus on how much they’re saving, when time is the bigger lever.
| Saving plan | Total contributed | Final value (7%) |
|---|---|---|
| $500/month for 30 years (start at 25) | $180,000 | $609,000 |
| $1,000/month for 20 years (start at 35) | $240,000 | $522,000 |
| $2,000/month for 10 years (start at 45) | $240,000 | $345,000 |
Same total contributed in two of these examples ($240K), but the earlier-starter ends up with $264,000 more wealth — purely from giving compound interest more time to work.
Where to compound your money tax-efficiently in Canada
The biggest free lunch in Canadian personal finance is shielding compound growth from tax:
- TFSA — tax-free growth and withdrawals. The canonical first registered account.
- RRSP — tax-deferred growth. Best for high-income earners.
- FHSA — tax-deductible AND tax-free for first home. Best for first-time home buyers.
- Non-registered — fully taxed. Last resort.
For any compound projection longer than 5 years, prioritize TFSA/RRSP/FHSA over non-registered accounts. The 30%+ annual tax drag in non-registered accounts compounds against you the same way returns compound for you.
What investment delivers each return rate?
| Expected return | What gets you there in Canada |
|---|---|
| 2-3% | Standard savings accounts (Big 5 banks) |
| 3.5-4.5% | High-interest savings (EQ Bank, Wealthsimple Cash) |
| 4-5% | Canadian GICs, government bonds |
| 5-6% | Balanced ETFs (XBAL, VBAL — 60% equity / 40% bonds) |
| 6-8% | Diversified equity ETFs (XEQT, VEQT) |
| 8-10% | US large-cap heavy (VFV, ZSP) — historically, not guaranteed |
For most Canadians, the realistic long-term return assumption is 6-7% in a diversified equity portfolio. Use higher rates only if you specifically expect US large-cap dominance to continue.
Read next
- TFSA Calculator — TFSA-specific projections with tax-free benefit
- RRSP Calculator — RRSP with tax refund modeling
- How to Invest in Canada — beginner playbook
- Best Canadian ETFs — what to invest in for compound growth
- TFSA Explained — why tax-free compounding wins
Frequently asked questions
How is compound interest calculated?
Compound interest is calculated using the formula A = P(1 + r/n)^(nt) + PMT × ((1 + r/n)^(nt) - 1) / (r/n), where P is starting amount, r is annual rate, n is compounding periods per year, t is years, and PMT is regular contribution per period. The calculator above handles this math automatically based on your inputs.
What's the Rule of 72?
The Rule of 72 estimates how many years it takes for an investment to double: divide 72 by your annual return rate (as a percentage). At 7% return: 72 ÷ 7 = ~10.3 years to double. At 9%: 72 ÷ 9 = 8 years. At 4%: 72 ÷ 4 = 18 years. It's a quick mental shortcut for compound growth that's accurate within ~10% for typical investment return rates.
Does compound frequency really matter?
Yes, but the difference is smaller than people expect. $10,000 at 7% for 30 years: annual compounding = $76,123; monthly = $80,931; daily = $81,651. Monthly vs daily is ~$700 difference over 30 years. Most Canadian ETFs and funds compound monthly via reinvested distributions. GICs typically compound annually unless specified otherwise.
What return rate should I use for projections?
Conservative: 4% (cash, GICs, bonds). Moderate: 6-7% (diversified equity ETFs like XEQT, VFV). Aggressive: 8-10% (US large-cap historical, less reliable for very long horizons). Most retirement planners use 6-7% for long-term equity portfolios. The calculator's default is 7%.
Should I use real or nominal returns?
For long-term planning, use real returns (after inflation, ~5-6%) so the projected value reflects today's purchasing power. For short-term goals or comparing investments, nominal returns (before inflation, ~7-8%) are fine. The calculator uses nominal — subtract 2% for real-return projections in 2026.
How does compound interest work in a TFSA vs non-registered account?
Inside a TFSA, all compound growth is tax-free — you keep 100% of the returns. In a non-registered account, dividends and realized capital gains are taxed each year, which reduces the compound base by ~30% on average. Over 30 years, this 'tax drag' costs ~30-40% of your final balance vs the same money in a TFSA.
Can I use this for mortgage payments?
Not directly — this calculator is for investment growth (positive compounding). Mortgage amortization uses similar math but in reverse. For mortgage calculations, use a dedicated mortgage calculator that accounts for principal-and-interest payments and amortization schedules.
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