Savings goal calculator
Find the monthly contribution needed to reach a target balance by a chosen month.
Use the selected decimal separator and no thousands separators. Amounts: 0–1e12. Interest: 0–100%. Duration: 1–1200 whole months. Results round to two decimal places; calculations retain full floating-point precision.
Illustrative calculations, not personal financial advice. Constant user-entered rates; no taxes, fees, market data or guarantees.
Calculated on your device. Financial entries are not uploaded or saved.
Calculation schedule
Table values are rounded for display. CSV contains every row; displayed rounded rows may not sum exactly.
Formula and worked example
The starting balance grows for n months. The remaining target is divided by the future-value factor for monthly contributions. With a zero starting balance, target 12000, zero interest and 12 months, the required monthly contribution is 1000.
Questions and assumptions
What if the starting balance already reaches the target?
The required contribution is zero when the assumed future value of the starting balance meets or exceeds the target. The result may exceed the target in this case. Contributions are constant, monthly, and use your selected timing. A rounded contribution is only a display approximation; actual deposits rounded to cents can leave a small shortfall.