Estimate the monthly contribution needed to reach a target balance. The result assumes monthly contributions and monthly compounding.
Decision guide
Turn the monthly result into a resilient plan
A savings-goal calculation solves for the recurring amount needed to bridge a starting balance and a future target under an assumed rate. The answer is sensitive to deadline, contribution timing, and return. Build a plan that can still work if the rate is lower or one or two deposits are missed.
Use three contribution scenarios
For a five-year goal, calculate the required monthly deposit with your expected rate, then repeat at zero growth and at a lower rate. The zero-growth result is a useful ceiling because it shows what your cash flow must do without help from interest. Round the chosen deposit upward instead of budgeting to the cent.
Before you decide
Keep an emergency fund separate from the goal.
Use an after-fee rate assumption.
Add known one-time deposits on their expected dates.
Review progress at least when the rate or deadline changes.
Method and limitations
This calculator is a planning aid, not a guarantee. Investor.gov models contributions, time, rate, and rate variance as separate inputs for the same reason. For a market-based goal, consider downside scenarios; for a deposit account, verify APY, variable-rate terms, withdrawal limits, and insurance coverage.