How to use this calculator
Use the same currency for your current savings and your goal. The estimate assumes contributions at month-end and monthly compounding.
If the existing balance and assumed growth already reach the goal, the required contribution is zero. Taxes, fees and inflation are excluded; uncertain returns are not guaranteed savings.
The formula
Monthly saving = max(0, [T − P(1 + r)^n] × r ÷ [(1 + r)^n − 1]). At 0%: max(0, (T − P) ÷ n).
A worked example
To grow 1,000 into 10,000 in 24 months without interest, save 375 at the end of each month.
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