Free Compound Interest Calculator - See Your Savings & Investments Grow
Compound interest is interest earned on both the initial principal and accumulated interest from previous periods. For example, $1,000 at 5% annual interest compounding monthly grows to $1,051.16 after one year (vs. $1,050 with simple interest). Over time, compound interest creates exponential growth, significantly increasing savings and investment returns.
This calculator uses the compound interest formula A = P(1 + r/n)^(nt) to show the growth potential of your savings and investments over time.
This Interest Calculator calculates both simple and compound interest growth on savings and investments. It supports various compounding frequencies (daily, monthly, quarterly, annually) and shows detailed year-by-year growth projections following standard Canadian financial calculation methods.
Standards: Compound Interest Formula, TFSA/RRSP Growth Calculations, Compounding Frequency Standards, Canadian Financial Regulations
Calculate final amount, starting principal, interest rate, or time period needed
Multiple compounding frequencies from daily to annually for accurate projections
Include regular deposits to see how consistent savings accelerate growth
See year-by-year growth breakdown showing principal and interest
Get accurate results immediately for investments, savings, and loans
No registration required, completely free interest calculator
Compound interest grows the balance by applying periodic interest to both the principal and previously accumulated interest.
Ignores fees, taxes, and withdrawals during the compounding period.
Compound Interest Formula
A = P(1 + r/n)^(nt)
Compound interest is one of the most powerful concepts in finance. Unlike simple interest, which is calculated only on the principal amount, compound interest is calculated on both the principal and accumulated interest from previous periods. This creates exponential growth over time.
Canadian financial institutions use compound interest for most savings accounts, GICs, TFSAs, and RRSPs. Understanding how compounding works helps you maximize returns and plan effectively for long-term financial goals.
Our calculator provides accurate projections for savings, investments, GICs, TFSAs, and RRSPs. Follow these steps:
Input your initial principal - the amount you're starting with or planning to invest.
Enter the annual interest rate (as a percentage) and how many years you'll be investing.
Select how often interest compounds. Daily compounding earns slightly more than monthly or annual.
Include regular monthly or annual contributions to see how they accelerate growth.
Different types of interest calculations affect how your money grows:
Calculated only on principal amount. $10,000 at 5% earns $500 yearly, totaling $15,000 after 10 years. Rarely used in real-world investments.
Calculated on principal plus accumulated interest. $10,000 at 5% grows to $16,289 after 10 years with annual compounding. Most common type.
How often interest is added. Daily (365x/year), monthly (12x), quarterly (4x), or annually (1x). More frequent = higher returns.
True annual return after compounding. 5% compounded monthly = 5.12% effective rate. Use this to compare different investments fairly.
Time is your most powerful tool. $5,000 invested at 7% at age 25 grows to $76,123 by 65. Same investment at 35 grows to only $38,697. Starting 10 years earlier doubles your money. Don't wait for perfect time or more money. Start with what you have today.
$10,000 at 5% for 20 years: annually compounded = $26,533, monthly = $27,126, daily = $27,181. Daily compounding adds $648 over annual. Always choose accounts with more frequent compounding. Small differences compound into significant gains over decades.
Withdrawing $5,000 from $50,000 portfolio at 7% doesn't just cost $5,000. Over 20 years, that $5,000 would become $19,348. You lose $14,348 in future growth. Emergency fund prevents raiding investments. Once invested, let compound interest do its work uninterrupted.
$500 monthly at 7% for 30 years becomes $612,438. Miss just 3 months yearly, total drops to $551,194. That's $61,244 lost. Automate contributions so you never miss. Dollar-cost averaging also smooths market volatility. Set and forget beats trying to time markets.
$10,000 earning 5% annually: taking interest gives $25,000 after 20 years. Reinvesting interest gives $26,533. Difference seems small, but over 40 years: $30,000 vs $70,400. Reinvesting doubles final amount. Always reinvest dividends in tax-sheltered accounts.
$500 monthly at 7% for 30 years in TFSA/RRSP: $612,438 all yours. In taxable account at 30% tax bracket: only $476,000 after-tax. TFSA/RRSP saves $136,438. Max out TFSA ($6,500/year) and RRSP (18% of income) before taxable investing. Tax-free growth compounds faster.
Most Canadians wait until 30s-40s to invest seriously. Every year delayed costs exponentially. Waiting from 25 to 35 to invest $5,000 costs $37,426 by retirement. Most people will never catch up. Start immediately, even with $50 monthly. Time in market beats timing market.
Many think 'only $200 monthly isn't worth it.' Wrong. $200 monthly at 7% for 35 years becomes $349,496. That daily coffee ($5) invested equals $70,000+ by retirement. Small consistent contributions compound into life-changing wealth. Don't dismiss small amounts.
Cashing RRSP for car, taking TFSA for vacation destroys compounding. $10,000 withdrawn at 30, earning 7%, costs $109,660 by 65. That vacation costs six figures. Maintain separate emergency fund (3-6 months expenses) so you never touch long-term investments. Compounding needs uninterrupted time.
$100,000 at 7% with 2% fees (5% net) for 25 years: $338,635. Same at 0.5% fees (6.5% net): $501,135. High fees cost $162,500. Canadian mutual funds average 2-2.5% fees. ETFs average 0.1-0.5%. Fees compound negatively. Every 1% in fees cuts final wealth by ~25%.
Interest calculated only on principal, not on accumulated interest. $10,000 at 5% simple interest earns $500 yearly, totaling $15,000 after 10 years. Rarely used in real world. Most loans and investments use compound interest instead. Simple interest is linear growth.
Interest calculated on principal plus accumulated interest. $10,000 at 5% compounded annually: year 1 earns $500 (on $10,000), year 2 earns $525 (on $10,500), year 3 earns $551 (on $11,025). After 10 years total is $16,289. Compound interest is exponential growth.
Original amount invested or borrowed before interest. On $10,000 investment, $10,000 is principal. Interest is calculated as percentage of principal plus any accumulated interest. Larger principal means more dollars earned in interest. Doubling principal doubles interest earned each period.
Percentage charged or earned annually. At 5%, you earn $5 per year per $100 invested. Higher rates dramatically increase final amount. $10,000 at 5% for 30 years becomes $43,219. At 7% becomes $76,123. At 10% becomes $174,494. Rate matters enormously over time.
How often interest is calculated and added to principal. Annual (once yearly), semi-annual (twice), quarterly (4×), monthly (12×), daily (365×), continuous (infinite). More frequent compounding increases growth. $10,000 at 5% for 20 years: annually = $26,533, monthly = $27,126, daily = $27,181.
Actual yearly return including compounding effects. 5% rate compounded monthly has 5.12% APY. 5% compounded daily has 5.13% APY. APY always equals or exceeds stated rate. Use APY to compare investments with different compounding frequencies. Higher APY means better return.
Money available now is worth more than same amount in future because it can earn interest. $10,000 today at 7% becomes $19,672 in 10 years. $10,000 in 10 years is worth only $5,083 today. Time value explains why early investing matters. Compound interest increases money's value exponentially over time.
Quick way to estimate doubling time: divide 72 by interest rate. At 6%, money doubles in 12 years (72÷6). At 8%, doubles in 9 years. At 10%, doubles in 7.2 years. Not exact but close enough for planning. Shows power of higher returns and importance of time.
True annual rate after accounting for compounding. 5% nominal rate compounded monthly is 5.12% effective rate. This is same as APY. Effective rate is what you actually earn or pay. Always compare effective rates, not nominal rates, when choosing investments or loans.
Mathematical limit where interest compounds infinitely often. $10,000 at 5% continuously compounded for 20 years becomes $27,183 (vs $27,181 daily). Used in theoretical finance and some bonds. Provides maximum possible return for given rate. Real-world difference from daily compounding is negligible.
This calculator is based on the following authoritative sources and research:
Important Note: Interest calculations are based on mathematical formulas and standard compounding methods. Actual returns may vary based on market conditions, fees, taxes, and account terms. Consult with financial advisors for personalized investment advice.
Everything you need to know about interest calculations
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