Advanced Investment Growth Calculator
Project how an investment portfolio may grow over time. Add recurring contributions, fees, taxes, inflation, and up to three scenarios to see which assumptions actually move the result.
Scenario 1
Set the baseline path you want the other scenarios to compare against.
Scenario 2
Turn this on when you want to compare a second path against your baseline.
Scenario 3
Add a third path when you want to compare one more outcome side by side.
Advanced assumptions
Adjust contribution timing, fees, taxes, inflation, and display settings when you want more realism.
$448,009
in 25 years (nominal money)
Manual assumption: 7.0% gross, 7.0% effective after fees and taxes
Growth chart
Net portfolio path after fees, shown year by year.
Summary metrics
Shown in nominal money. Gross return is 7.0% and effective annual return after fees and taxes is 7.0%.
$448,009
$160,000
$288,009
7.0%
35.7%
64.3%
Year 18
Year 18
Cost and contribution impact
Gross vs net return, plus how contribution timing shapes the ending result.
7.0%
7.0%
7.0%
$0
$0
$0
$0
$237,303
$86,009
Milestone table
Key checkpoint years shown in nominal money.
Portfolio checkpoints
Read across each year to compare value, invested capital, and gain mix.
- Portfolio value
- $16,925
- Total contributed
- $16,000
- Total gains
- $925
- Portfolio value
- $49,825
- Total contributed
- $40,000
- Total gains
- $9,825
- Portfolio value
- $105,681
- Total contributed
- $70,000
- Total gains
- $35,681
- Portfolio value
- $293,900
- Total contributed
- $130,000
- Total gains
- $163,900
- Portfolio value
- $448,009
- Total contributed
- $160,000
- Total gains
- $288,009
| Year | Portfolio value | Total contributed | Total gains | Gains as % of value |
|---|---|---|---|---|
| Year 1 | $16,925 | $16,000 | $925 | 5.5% |
| Year 5 | $49,825 | $40,000 | $9,825 | 19.7% |
| Year 10 | $105,681 | $70,000 | $35,681 | 33.8% |
| Year 20 | $293,900 | $130,000 | $163,900 | 55.8% |
| Year 25 | $448,009 | $160,000 | $288,009 | 64.3% |
Scenario insights
Net return after costs
This scenario starts from 7.0% gross annual return, annual fees of 0.00%, and lands at 7.0% effective annual return after fees and taxes.
Nominal vs today's money
Results are currently shown in nominal money using 2.5% inflation. Final projected value is $448,009.
Contribution and cost context
Over 25 years, monthly contributions and cost drag compound together. Direct fees plus taxes total $0, while the ending-value opportunity cost is $0.
Want to understand the math?
How to interpret this result
The final portfolio value is a model output based on the assumptions entered above. It is not a forecast.
Read the result in three parts:
- Total contributed — the money added by you.
- Total gains — the growth produced by the return assumption.
- Final portfolio value — contributions plus growth after any selected fees, taxes, or inflation settings.
A strong result can come from high returns, large contributions, long time horizons, or a mix of all three. The useful part is seeing which input matters most.
What to watch
Time horizon
Longer periods give compounding more time to matter. Shorter periods depend much more on the money you contribute yourself.
Return assumption
A 1% change in expected annual return can create a large difference over 20–30 years. Use conservative, baseline, and optimistic scenarios rather than relying on one number.
Fees
Fees reduce the return that stays invested. Even a small annual fee can become material over long periods.
Inflation
Nominal results show the future account balance. Inflation-adjusted results estimate what that balance may be worth in today’s purchasing power.
Contributions
Recurring contributions often matter more than people expect. Increasing contributions over time can change the result more than chasing a higher return assumption.
A simple way to use this calculator
Run three scenarios:
- conservative return
- baseline return
- optimistic return
Then change only one input at a time: contribution amount, time horizon, fee level, or inflation setting.
If the result only works with optimistic assumptions, treat the plan carefully.
Related reading
Methodology
Want the formulas and assumptions?
FAQ
Is this calculator a prediction?
No. It uses the assumptions you enter to model a possible path. Real investment returns will vary.
What return rate should I use?
Use a range. A conservative, baseline, and optimistic scenario is more useful than one precise number.
Should I include inflation?
Yes, if the result is for long-term planning. Inflation-adjusted values are usually more useful for understanding future purchasing power.
Why do small changes create big differences?
Because returns, fees, and inflation compound over time. Small annual differences can become large over decades.
Does the calculator include market volatility?
No. It uses average return assumptions. Use lower-return scenarios to stress-test the plan.
Should I use nominal or real values?
Use nominal values for future account balances. Use real values when thinking about lifestyle or purchasing power.