Calculateur d'Objectif d'Épargne
Calculez le temps nécessaire pour atteindre votre objectif d'épargne. Entrez votre solde de départ, le montant cible, le taux d'intérêt et vos versements mensuels.
How the savings goal timeline is calculated
The calculator projects your balance month by month, adding your monthly contribution and applying interest at the stated rate. Interest is credited at the end of each month on the opening balance. This continues until the projected balance reaches or exceeds your goal. The result is the number of months until you hit the target, shown as years and months.
What this doesn't include
The projection assumes a fixed rate, fixed monthly contribution, and no withdrawals. In practice, savings rates change - particularly for variable-rate accounts. Tax on interest is also not included: in many countries, savings interest above a threshold is subject to income tax, which reduces the effective rate. Check whether a tax-sheltered account (ISA in the UK, TFSA in Canada, offset account in Australia) is available for your goal - the tax saving can meaningfully accelerate your timeline.
Why your bank's projection may show a different date
Banks calculate interest based on the daily balance in most countries, applying the daily rate (annual rate ÷ 365) to each day's balance. This can produce slightly different results than monthly compounding at the same stated rate. For standard savings accounts, the difference over typical goal timelines is small - usually less than one month. For longer timelines with larger balances, the difference grows.
Frequently asked questions
How does compound interest help me reach my savings goal faster?
With compound interest, the interest you earn in each period is added to your balance and earns interest itself in subsequent periods. Over time, this acceleration becomes substantial. £10,000 at 5% grows to £16,289 after 10 years with compound interest - compared to £15,000 with simple interest. The longer your timeline, the larger this difference becomes. Regular monthly contributions amplify the effect because each contribution starts earning interest from the day it is deposited.
What savings rate should I use?
Use the rate your savings account, ISA, GIC, or investment account will actually pay. For a savings account or fixed-term deposit, use the AER (Annual Equivalent Rate) or effective rate, not the nominal rate. For an investment goal, a long-run average of 5–7% is commonly used for globally diversified equity portfolios, though this is speculative and involves risk that a savings account does not.
What if I miss a monthly contribution?
Missing one contribution delays your goal slightly. The calculator assumes consistent monthly contributions - if you skip a month, your actual timeline will be a month or so longer than shown. The most important thing is consistency over time, not perfection. A missed month matters far less than permanently reducing your monthly savings amount.
Can I use this to plan for a house deposit?
Yes. Set the goal amount to your target deposit, enter any existing savings, set the expected savings rate (use a high-interest savings account or ISA rate), and enter your monthly savings amount. The timeline shows when you will reach the deposit target. Note that if property prices are rising, your target may also increase - adjust the goal periodically to reflect current prices.
How is the monthly contribution calculated if I set the goal and timeline?
If you know the goal and timeline but not the required monthly savings, use the annuity formula in reverse: the required monthly payment = (goal − current balance × (1 + r)^n) × r / ((1 + r)^n − 1), where r is the monthly rate and n is the number of months. This calculator takes the contribution as an input and shows the resulting timeline - you can adjust the contribution until the timeline matches your target date.
Add this calculator to your site
Free to use. The embed is under 40KB, carries no ads and no tracking, and inherits your page's background. The code includes a link back to this page.
The repayment engines behind this site are tested against worked examples published by FRED, the Bank of Canada, the Bank of England and the Reserve Bank of Australia. Found an error? Contact us