Compound interest calculator
Explore how your starting balance, regular contributions, time and return assumptions affect your projected savings.
Your numbers
Your result
Example scenarioProjected balance after 20 years
5.00% hypothetical annual return · C$250 added each month
Try a different scenario
See the balance at returns 1 percentage point lower and higher.
Or save these inputs, change a number and compare with your saved scenario.
Why this number?
Your return is an effective annual rate, converted to monthly growth using i = (1 + r)^(1/12) − 1. The balance grows monthly. End-of-month contributions are added after growth; beginning-of-month contributions are added before it.
Result breakdown, line by line
Values use the assumptions above and the exact inputs entered. Compare scenarios before making a decision.
Planning estimate. Rate and return assumptions can change the result.
How is this calculated?Money Figures · Compound interest calculator · Model v0.1.6 · Values in Canadian dollars
Charts, table & comparisonsTake a closer look at your result.
Your projection
SHOWING OUR WORK
Assumptions & methodology
Return convention
Your return is an effective annual rate, converted to monthly growth using i = (1 + r)^(1/12) − 1. The balance grows monthly. End-of-month contributions are added after growth; beginning-of-month contributions are added before it.
Growth and buying power
Contributions = starting balance + monthly contribution × number of months. Growth = projected balance − contributions. Today's purchasing power = future balance / (1 + inflation rate)^years. This is an illustration of constant inflation, not an inflation forecast.
Limits
Returns are hypothetical and constant; markets vary and losses are possible. The model does not calculate tax, TFSA or RRSP contribution room, benefit clawbacks, trading costs, varying returns or changing contributions. Enter a return after fees if you want to reflect management costs.
A worked example
Start with C$10,000, add C$250 at the end of each month and explore a hypothetical 5% annual return over 20 years. Compare the total contributed with the projected growth.
Understand the result
RRSP or TFSA? Start with two tax rates
See how equal-cost RRSP and TFSA comparisons change with future withdrawal tax, refund reinvestment and contribution-room assumptions.
Read guideBuild a monthly savings plan
Set a Canadian savings target, choose a timeline and see how a return assumption changes the monthly amount you need to contribute.
Read guideImportant: planning estimate, not financial advice
Money Figures provides general calculator estimates based on the inputs and assumptions shown. It does not consider your full financial circumstances and is not financial, tax, investment, lending or legal advice. Results do not guarantee lender, insurer, government or tax treatment. Confirm material decisions with the relevant institution or an appropriately qualified professional.
Your next money decision
Make the savings assumption realistic
Compare several returns and a zero-return case. Actual investing costs, taxes and market outcomes may differ.
Explore the next tool or guide →Sources
Sources checked: 2026-10-09. Targeted technical check: 2026-10-11. Financial model v0.1.6; release v0.2.9. Independent financial review is pending. Calculation standards · Change history.