Savings Calculator

Before you enter your numbers

Enter the balance available now and the monthly amount you can save. The rate field uses a nominal annual rate with monthly compounding. If a bank quotes APY, convert it to the equivalent nominal monthly-compounding rate rather than entering it unchanged when precision matters.

• Starting savings
• Monthly deposit
• Years
• Annual interest rate

Input reference

• Starting savings: The current balance committed to this goal. Use a recent statement and exclude money reserved for unrelated goals. This starting value is already invested, so do not also enter it as a recurring contribution.
• Monthly deposit: New money added at the end of each month. Convert annual saving to a monthly amount by dividing by 12. This page does not schedule skipped months or one-time deposits automatically.
• Years: The duration of the calculation in years. Longer periods give growth or withdrawals more time to operate. This is a chosen modeling horizon, not a prediction of an investment term or your lifetime.
• Annual interest rate: An assumed nominal annual rate, divided by 12 in monthly projections. It is held constant. It is not a guaranteed yield, and the default should be replaced with an assumption suited to your scenario.

Formula and calculation method

The model applies annual rate / 12 monthly and adds contributions at month end. For an APY expressed as decimal a, the equivalent nominal annual rate is 12 × [(1 + a)^(1/12) − 1]. Interest remains in the account and compounds.

Worked example

At zero interest, 2,000 already saved plus 250 monthly for two years totals 8,000. With interest, the projected balance is higher, provided the assumed rate actually applies throughout and fees do not offset the interest.

How to interpret the result

The result panel reports future savings, total deposits and interest earned.

Variable-rate accounts can change their rate, promotional rates can expire, and withdrawal conditions may apply. The model omits tax on interest, account charges and deposit-insurance eligibility. Check the protection limit and institution rules in your jurisdiction instead of assuming every balance is protected.

How regular deposits build savings

The calculator grows the starting balance at the annual interest rate and adds a regular monthly deposit. The results separate your total deposits from interest earned so you can see how much of the final balance came from saving versus compounding.

For short-term cash goals, use a realistic deposit or savings-account rate rather than a stock-market return. If the account rate can change, test a lower-rate scenario as well.

Plan for rate changes and irregular saving

An introductory savings rate may not last for the full horizon. Compare the promotional assumption with a lower ongoing rate, or divide the calculation into separate periods. A single long-term result based on a temporary offer can misrepresent what the account might earn.

Missing deposits can matter more than small rate differences for a short-term goal. Compare a lower monthly amount or a shorter saving period before chasing a higher assumed rate. Keep funds needed immediately separate if access restrictions or withdrawal penalties would make the savings unavailable.

Use a savings rate that matches the account, not an investment return

Cash savings goals usually call for a bank or credit-union rate assumption rather than a stock-market return. If the account rate is promotional or variable, compare a lower ongoing rate. For short horizons, the amount you deposit often matters much more than a small difference in interest rate.

Keep emergency cash and planned spending money accessible. A higher advertised rate is not automatically better if it requires a lock-up, minimum balance or conditions that make the money unavailable when the goal arrives.

Use The Result In The Next Calculation

If the ending balance is tied to a specific goal, use the savings goal calculator to solve for the required monthly deposit. Use the APY or CD calculator when the account quote is stated as APY or a fixed term instead of a nominal rate.