Savings Goal Calculator
Work out how much to save each month to reach your savings goal.
Input Data
Results
Savings accumulation: principal vs interest
At a glance:The Savings Goal Calculator works backwards to find the monthly saving needed to reach a target by a set date. It combines two forces: your current savings grow at the expected annual return to a future value, and the gap between the target and that future value is solved with a future-value-of-an-annuity formula into the required monthly contribution. A larger gap, shorter term or lower return means a higher monthly saving. This reverse planning is especially useful in Hong Kong for concrete goals such as a mortgage down payment, child's education, travel fund or emergency money.
Formula
Grow current savings by compounding: P × (1 + r)^n (r monthly rate, n months).
Solve monthly contribution for the gap: PMT = (Target − FV of principal) × r ÷ ((1 + r)^n − 1).
Interest contribution = Target − current savings − total monthly contributions.
How to Use
- Enter the target amount and current savings.
- Set the expected annual return and term.
- The required monthly saving is shown instantly.
FAQ
What does the monthly saving required mean?
It is the fixed amount you must set aside each month to reach your target by the chosen date, given your current savings and expected annual return. It already accounts for the future value your existing savings will grow to.
Why does a longer term lower the monthly saving?
More time lets both your current savings and monthly contributions compound longer, so each dollar works harder. Doubling the term usually more than halves the required monthly amount, depending on the return rate.
How does the expected annual return affect the result?
A higher assumed return lowers the monthly saving needed, because more of the target is met by investment growth. Using an overly optimistic rate, however, risks falling short — base it on a realistic, conservative estimate.
Does this include inflation?
No. The calculator works in today's dollars; it does not discount for inflation. For long horizons, a real (inflation-adjusted) return may be more meaningful, or add a buffer to your target.
Is the interest contribution guaranteed?
No. Returns are not guaranteed; the interest shown is an illustration based on the rate you enter. Actual results depend on the performance of the savings or investment vehicle you use.
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References
Content review: Calculatorism Finance Team. Results are for reference only; please refer to the relevant authorities for the official figures.