The Monthly Savings Plan Calculator estimates the contribution needed each month to reach a future savings target. It accounts for an existing balance, the time available, and an optional expected return, making it useful for emergency funds, major purchases, education costs, or other planned goals.
The result is a planning contribution rather than a guarantee. Actual returns, fees, taxes, and skipped deposits can change the outcome, so conservative assumptions are generally more useful for short-term goals.
1. Set the target amount
Enter the total balance you want to have at the end of the plan.
2. Enter current savings
Include only money already assigned to this goal.
3. Choose the time horizon
Provide the number of months available before the target date.
4. Add an expected annual return
Use 0% for cash savings or a conservative rate appropriate to the account.
5. Review the monthly contribution
Compare the required deposit with your budget and adjust the goal or timeline if necessary.
Formula
Monthly rate r = Annual return / 12Future value of current savings = Current savings × (1 + r)^nRequired monthly contribution = (Target - Future value of current savings) × r / ((1 + r)^n - 1)If r = 0:Required monthly contribution = (Target - Current savings) / nWhere
Assumptions
Contributions are made at the end of each month and the return compounds monthly. Taxes, account fees, and changing interest rates are not included unless reflected in the return assumption.
Required monthly contribution based on the values entered.
Results are estimates and may differ from payroll, tax, legal, investment, or accounting systems.
• Target amount: $18,000
• Current savings: $3,000
• Time horizon: 24 months
• Expected annual return: 3.6%
Monthly rate = 3.6% / 12 = 0.3% = 0.003
Future value of current savings = $3,000 × (1.003)^24 = $3,223.48
Required contribution = ($18,000 - $3,223.48) × 0.003 / ((1.003)^24 - 1)
Required contribution = $593.72 per month
Required monthly savings: approximately $593.72
Saving about $593.72 at the end of each month would be expected to reach $18,000 in 24 months under the stated return assumption.
Use the expected net annual yield, not an advertised rate that may change. For a conservative plan, using 0% or a lower estimate provides a buffer.
That means the current balance is already sufficient to meet the target under the entered assumptions. No additional monthly contribution is mathematically required.
Yes. This model assumes deposits at month-end. Deposits made at the beginning of each month would earn one additional month of growth and slightly reduce the required amount.
Yes, but the expected return is uncertain. For market investments, test several return scenarios rather than relying on a single forecast.
A longer period spreads the remaining target across more deposits and allows more time for compounding, if a positive return is assumed.