How to use our future value calculator
- Choose a currency symbol for display.
- Enter present value, interest rate, rate type, and compounding frequency.
- Set the investment duration in years and months.
- Optional: add periodic contributions — none, deposits only, withdrawals only, or both — with frequency, timing (beginning or end of period), and annual growth rates.
- Click Calculate — future value, accumulated interest, APY, time-weighted return, and breakdown table or chart update together.
Need to judge profitability from cash flows instead? Switch to the IRR Calculator using the tabs above the form.
How to calculate future value
This calculator combines compound interest on your starting balance with the future value of a series of equal periodic payments. When deposits are made at the end of each compounding period (the most common case), the contribution portion uses the ordinary annuity formula:
Deposits at end of each period (ordinary annuity); PMT = payment, r = annual rate, n = compounds per year, t = years
Your total future value equals the compounded present value plus the future value of all contributions (minus withdrawals), with interest applied each period according to your compounding setting.
Worked example
$10,000 present value, 5% yearly rate compounded monthly, 4 years, with $100 deposited at the end of each month:
- Estimated future value ≈ $17,510.44
- Accumulated interest ≈ $2,710.44
- Additional deposits = $4,800.00
- Effective annual rate (APY) ≈ 5.12%
- Time-weighted return ≈ 22.09% over the full period
Deposits at beginning vs end
Contributions at the beginning of each period earn one extra compounding interval compared with end-of-period deposits. The toggle mirrors annuity-due vs ordinary-annuity math.
Time-weighted return
The time-weighted return (TWR) links period-by-period growth on your balance (excluding the effect of deposit timing on headline totals). It helps compare investment performance when you add money along the way.
Examples and use cases
Real-world use cases
- 401(k) projection: An employee models $8,000 present balance plus $300 monthly deposits at 6% for 25 years before retirement.
- Lump-sum vs DCA: Someone compares beginning-of-month vs end-of-month deposit timing on the same contribution schedule.
- Goal planning: A saver works backward from a $50,000 target to see whether current deposits and rate reach the goal in 8 years.
Related tools
For a broader compound-interest workspace with inflation and tax options, try the Compound Interest Calculator. To convert a nominal rate into APY for comparison, see the APY Calculator.