Projected balance and inflation-adjusted value
Future value combines your initial amount, annual contributions, and modeled gain or loss. Total contributions includes the initial investment. Return on contributions is gain divided by that total; it is a whole-period ratio, not an annualized, time-weighted, or cash-flow-adjusted return. Inflation-adjusted value expresses the ending amount in today’s purchasing power. Annual contribution used is the entered amount or the calculated unrounded contribution. A goal already covered by the initial balance needs no additional contributions; the projected value can then exceed the goal.
To annualize growth between two values with no intervening contributions, use the CAGR Calculator rather than treating contributed cash as investment gain.
The formula
The entered return is applied once per year as an annual growth rate; 10% multiplies a balance by 1.10. Start-year contributions participate in that year’s growth or loss, while end-year contributions are added afterward. Inflation-adjusted value is future value divided by (1 + annual inflation)^years. Negative returns down to -99% are supported. In contribution mode, the goal minus the projected initial balance is divided by the accumulated value of one unit contributed each year. The result is floored at zero. This recurrence also handles zero and negative returns without dividing by the return rate. The goal is a nominal future amount, not today’s purchasing power.
Worked example
Starting with 10,000, adding 1,000 at each year-end, and earning 10% gives 14,200 after two years. With 2% inflation, that equals about 13,648.60 in today’s money.
How to use this calculator
- Choose future value or annual contribution, then enter the initial investment and whole number of years.
- Enter your annual contribution or nominal future goal. Set the annual return and, in additional options, contribution timing and inflation.
- Review the live result, annual contribution used, total deposits and value in today’s money; inspect the annual balances.
Nominal and real value
A larger future number can buy less if prices rise. The inflation-adjusted result estimates present purchasing power, not a guaranteed price index outcome.
Keep nominal return and inflation assumptions internally consistent.
Sequence risk is hidden
A constant rate creates a smooth line, while actual markets rise and fall. With contributions or withdrawals, the order of returns can affect the ending value.
Use several return scenarios rather than treating one rate as a forecast.
Assumptions & limitations
What this calculation assumes
- One return and inflation rate each year.
- Fixed annual contribution.
- No taxes, fees, or withdrawals.
What to keep in mind
- Market volatility is not modeled.
- Return on contributions is not a time-weighted performance measure.
- Inflation varies by person and period.
Common questions
What is inflation-adjusted value?
It expresses the future amount in approximate today-money purchasing power.
How does contribution timing change the result?
A start-year contribution experiences one more annual return period. It produces more at a positive return, less at a negative return, and the same amount at zero return.
Can annual return be negative?
Yes, above −100%, for loss scenarios.
Can this be used as a future value calculator?
Yes, for one initial balance and fixed annual contributions. Set the annual contribution to zero for a single starting amount. Monthly contributions use a different schedule; use the SIP or compound interest calculator for that task.
How much should I contribute each year to reach a goal?
Choose Annual contribution and enter the desired future amount. The result uses the chosen return and contribution timing. If the initial investment alone reaches the goal, it shows zero additional contribution rather than a withdrawal.
Sources & further reading
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