Monthly Savings Calculator
Estimate how your savings could grow with an initial balance, regular monthly deposits and interest. See your projected balance, total deposits and estimated interest earned, and adjust your deposits and interest assumptions to compare scenarios.
Results
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Projected Savings Balance
Growth above contributions is modeled interest under your chosen assumptions, not a guaranteed investment return.
Savings growth over time
Yearly savings projection
| Year | Total Deposits During Year | Interest Earned During Year | Year-End Savings Balance |
|---|
Monthly growth schedule
Each month: interest = opening balance × monthly rate; closing balance = opening balance + interest + deposit. The deposit is added after that month's interest, so it starts earning interest the following month.
| Month | Opening Balance | Interest Earned | Monthly Deposit | Closing Balance |
|---|
How Monthly Savings Are Calculated
The calculator follows these steps, using deposits made at the end of each month:
- Convert the annual rate to a monthly decimal rate.
- Convert the years into monthly periods.
- Grow the initial balance with monthly interest.
- Accumulate the regular end-of-month deposits.
- Add the two parts to get the projected balance.
- Report total deposits separately from modeled interest.
r = APR / (100 × 12)
n = 12 × years
FV = P × (1 + r)^n + C × ((1 + r)^n − 1) / r (r > 0)
FV = P + C × n (r = 0)
Total contributed = P + C × n
Interest earned = FV − (P + C × n)
P is the initial balance, C the monthly deposit, r the monthly rate, n the number of months and FV the projected balance. The zero-rate case is separate because the annuity term divides by r. With a 0% rate the balance grows only through the initial amount and deposits.
Timing matters. A deposit made at the end of a month earns nothing that month and begins earning the next month, so earlier deposits earn more interest than later ones. All figures here, including the chart and tables, use this same assumption. Other inputs equal, a higher assumed rate gives a higher projected balance, but the rate is only an assumption.
What Is a Monthly Savings Calculator?
A monthly savings calculator estimates the future value of an initial balance plus regular monthly deposits. It shows the combined effect of saving consistently and earning interest, so you can see how a plan might look years from now.
The result is a mathematical estimate based on the numbers you enter, not a guarantee of future results.
How to Use the Monthly Savings Calculator
- Initial Savings Balance: enter what you have already saved.
- Monthly Savings Deposit: enter the amount you plan to add each month.
- Annual Interest Rate: enter the rate you want to assume.
- Savings Period: enter whole years from 1 to 100.
- Display Currency: pick how amounts are formatted.
Press Calculate Monthly Savings to see the projected balance, total contributions and estimated interest. The chart shows the balance against your contributions over time, and the yearly table breaks each year into deposits, interest and year-end balance. Changing the currency changes the display only; it does not convert your balance with exchange rates.
How Monthly Savings Grow Over Time
Three things build the final balance: the starting balance, the recurring deposits and the accumulated interest. Regular deposits steadily raise the balance. In a monthly-compounding model, interest is earned on the existing balance each month, which includes interest from earlier months, so growth builds on itself.
Formula for Calculating Monthly Savings
For a positive rate, FV = P(1 + r)^n + C((1 + r)^n − 1)/r, where r is the annual rate divided by 100 and by 12, and n is the number of months. With r = 0, FV = P + C × n, because the formula would otherwise divide by zero. The model assumes monthly compounding and deposits at the end of each month.
Example of a Monthly Savings Calculation
Take an initial balance of $1,000, a monthly deposit of $200, a 5% annual rate, 10 years, monthly compounding, end-of-month deposits and no fees or taxes. There are 120 deposits totalling $24,000, so total money contributed is $25,000. The monthly rate is 0.4167%.
The projected balance is about $32,703.47, so estimated interest earned is about $7,703.47. The final balance is exactly the money contributed plus the modeled interest.
How Interest Rates Affect Savings Growth
With the deposit, balance and period unchanged, a higher assumed rate increases the projected balance, because compounding lets earlier interest earn further interest. Try the same plan at different rates to compare. The rate is an input assumption, and real account rates can change, so no particular rate or increase should be expected.
How Monthly Deposits Affect Your Savings
Raising the monthly deposit raises both total contributions and the interest those deposits can earn. Lowering it does the opposite. Deposit timing matters too, since money added earlier has more time to earn interest. The calculator illustrates the arithmetic; it does not recommend any particular deposit.
How the Savings Period Affects Your Future Balance
With a positive deposit and rate, a longer period usually produces a higher balance, because there are more deposits and more months of compounding. A longer horizon does not remove uncertainty about future rates, fees or account terms.
What Is the Difference Between Contributions and Interest Earned?
The initial balance is what you start with; total monthly deposits are the deposit times the number of months; total money contributed is the sum of both. Estimated interest earned is the projected balance minus that sum. In the example, $25,000 is contributed and about $7,703.47 is modeled interest, together making about $32,703.47.
What This Monthly Savings Calculator Includes and Excludes
It estimates future value from monthly deposits and a fixed, monthly-compounded rate. It excludes:
- taxes on interest;
- account fees and charges;
- withdrawals;
- changes in interest rates;
- missed, delayed or irregular deposits;
- inflation and changes in purchasing power;
- market fluctuations or investment losses;
- any other account-specific rules.
For real-world outcomes, refer to the terms of your actual account or product.
How to Interpret Your Savings Projection
The projected balance is the estimated total at the end of the period. It is larger than what you deposit because part of it is modeled interest. The yearly table shows how each year contributes. Treat all figures as estimates that depend on your assumptions and on real account conditions.
Frequently asked questions
How do I calculate my monthly savings?
Enter your initial balance, monthly deposit, annual interest rate and savings period, then press Calculate. The calculator applies a monthly-compounding future-value model.
How much will I save by depositing money every month?
It depends on the starting balance, the deposit amount, the number of deposits and the assumed interest rate. The calculator estimates the result from those inputs.
Does the calculator include compound interest?
Yes. It models monthly compounding: interest is applied to the existing balance each month, then the end-of-month deposit is added.
Can I use the calculator with 0% interest?
Yes. With 0% interest the future balance equals the initial savings plus all monthly deposits.
What happens if I increase my monthly deposit?
Increasing the deposit generally increases the projected final balance, assuming the other inputs stay the same.
Does the calculator include my existing savings?
Yes. The initial savings balance is included and earns interest throughout the selected period.
Are monthly deposits assumed to happen at the beginning or end of each month?
At the end of each month. Deposits made at the beginning would earn extra interest and give a different result.
Does the calculator include taxes or savings account fees?
No. The model excludes taxes, fees, withdrawals and other account-specific costs.
Is the projected savings balance guaranteed?
No. It is a mathematical estimate based on your inputs and stated assumptions. Actual outcomes may differ if rates, deposit timing, fees or account conditions change.
Can I calculate my savings in different currencies?
The currency selector changes the display format only. It does not convert your savings or apply exchange rates.
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This calculator provides estimates based on the initial balance, monthly deposit, assumed annual interest rate and period you enter. It assumes a constant rate compounded monthly, with deposits at the end of each month and no withdrawals, taxes, fees or inflation adjustments. Results are mathematical projections for educational purposes only. They are not guaranteed financial outcomes, an offer from any institution, or personalized financial advice.