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Savings Calculator

Calculate how much your savings will grow over time with compound interest and regular monthly deposits.
Decision Context
Page-specific guidance for using this result in a real planning decision.

This calculator turns a savings goal into a repeatable plan by connecting starting balance, monthly deposits, rate assumptions, and time.

Use it for emergency funds, travel budgets, down payments, education savings, or any target where consistent deposits matter more than investment complexity.

Look at both time-to-goal and total contributions so you can see whether your plan is being driven primarily by habit, interest, or unrealistic timing assumptions.

Methodology, assumptions, and limitations

Savings growth is modeled from the opening balance, regular deposits, rate, and time horizon. The calculation distinguishes money contributed from interest earned to make the plan easier to evaluate.

Assumptions
  • Deposits occur consistently.
  • The stated rate remains unchanged.
  • Interest compounds at the selected frequency.
Limitations
  • Bank rates can change over time.
  • Inflation reduces future purchasing power.
  • Withdrawal penalties, taxes, and account limits are not modeled automatically.

Sources and standards

Related calculators

Compound Interest CalculatorRetirement Calculator
Calculator
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Analysis
Interpretation of the current calculator output

Enter values to see detailed analysis and insights.

How to Use

Step-by-step instructions
  1. 1Enter the amount you are starting with.
  2. 2Input the amount you plan to deposit every month.
  3. 3Set how many years you plan to save.
  4. 4Input the expected annual interest rate your account earns.
  5. 5Review your final balance and see how much was generated purely from interest.

Compound Savings (Future Value)

The total savings amount (A) combines the future value of your initial principal (P) and the future value of your monthly deposits (PMT), both compounding over time.
A = P(1+r/n)^(nt) + PMT[((1+r/n)^(nt) - 1) / (r/n)]

Variables:

ATotal final balance
PInitial starting deposit
PMTRegular monthly contribution
rAnnual interest rate (decimal)
nCompounds per year (12)
tTime in years

Example

Saving for 10 years at 5%

Inputs:

Starting Deposit:$1,000
Monthly Deposit:$200
Time Period:10 Years
Interest Rate:5%

Steps:

  1. 1.Total deposits = $1,000 initial + ($200 * 120 months)
  2. 2.Total deposits = $25,000
  3. 3.Apply compound interest formula calculated monthly.
  4. 4.Interest exponentially increases your balance.
Result:
$32,503 Final Balance ($7,503 free interest)

Frequently Asked Questions

Does this compound monthly or annually?

Because most people contribute to savings accounts monthly, this calculator defaults to monthly compounding to align perfectly with your monthly deposits.

What is APY vs APR?

APR is the simple interest rate. APY is the Annual Percentage Yield, which takes compounding into account. This calculator asks for the base rate (similar to APR) and calculates the compounding for you.