Monthly Savings Calculator
See the future value of a starting balance plus a fixed monthly saving amount.
Quick answer
Enter starting savings, a regular monthly deposit, annual interest rate and time. The result separates money contributed from estimated interest.
Formula used
The calculator applies monthly interest to the existing balance and adds each monthly deposit at the end of the month.
Worked example
Saving $250 monthly for five years contributes $15,000, plus the starting balance. A positive constant rate adds estimated interest over the same period.
How to interpret the result
The projection assumes every deposit is made, the rate stays constant and there are no withdrawals, taxes or fees.
Sources and methodology
Investor.gov compound interest calculator · Consumer Financial Protection Bureau: saving. Sources explain general concepts; ToolGemini calculations use only the values you enter and the formula shown above.
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Frequently asked questions
When is the monthly deposit added?
At the end of each month. Depositing at the beginning would produce a slightly higher result.
What rate should I enter?
Use a conservative annual rate relevant to the account or scenario, not a promotional headline you may not keep.
Can I use zero interest?
Yes. Enter zero to see the result from contributions alone.