Calculator Inputs
Example Data Table
This sample shows how yearly balances may progress using a moderate deposit plan and steady long-term growth assumptions.
| Year | Starting Balance | Annual Contribution | Ending Balance | Inflation Adjusted Balance |
|---|---|---|---|---|
| 1 | $10,000.00 | $6,000.00 | $17,101.38 | $16,684.27 |
| 5 | $41,925.57 | $6,364.85 | $52,388.94 | $46,119.72 |
| 10 | $91,478.86 | $7,027.57 | $106,864.19 | $83,337.15 |
Formula Used
The calculator converts the annual return into an effective monthly rate based on the selected compounding schedule. It then adjusts growth for management fees and taxes.
Effective monthly gross rate: ((1 + annual rate / compounding periods) ^ (compounding periods / 12)) - 1
Effective monthly net rate: ((1 + (annual rate - fee) / compounding periods) ^ (compounding periods / 12)) - 1
Monthly ending balance: Previous balance + contribution + after tax monthly growth
After tax growth: Net monthly growth - (net monthly growth × tax rate)
Inflation adjusted value: Ending balance / ((1 + inflation rate) ^ years)
Beginning-of-month contributions are added before growth. End-of-month contributions are added after growth. Annual contribution growth increases the monthly deposit every new year.
How to Use This Calculator
Enter your starting investment amount first. Add your expected monthly contribution and estimated annual return.
Select how often the investment compounds. Then include any fee drag, inflation rate, tax rate, and optional annual increase in contributions.
Choose whether deposits happen at the beginning or end of each month. Add a target balance if you want goal tracking.
Press Calculate Projection. The results appear above the form, followed by a chart and downloadable report options.
Use the inflation adjusted value to compare future wealth in today’s money. This helps avoid overly optimistic planning assumptions.
Frequently Asked Questions
1) What does this calculator estimate?
It estimates how an investment may grow over time using your starting amount, recurring deposits, compounding schedule, taxes, fees, inflation, and contribution growth assumptions.
2) Why is inflation included?
Inflation shows the future balance in present-value terms. A large nominal balance may buy less in the future, so real value gives a more practical planning view.
3) What is the difference between nominal and real value?
Nominal value is the projected ending balance. Real value adjusts that balance for inflation, showing approximate purchasing power in today’s dollars.
4) How do management fees affect projections?
Fees reduce the effective growth rate before compounding completes. Even small annual fees can lower long-term balances significantly across many years.
5) Why does contribution timing matter?
Deposits made earlier have more time to compound. Beginning-of-month contributions usually create slightly higher ending balances than end-of-month contributions.
6) Does this calculator guarantee future returns?
No. It provides a structured estimate using your assumptions. Actual market performance, taxes, costs, and contribution behavior can differ from projections.
7) What does CAGR mean here?
CAGR is the compound annual growth rate implied by the projection. It summarizes average yearly growth over the full investment horizon.
8) When should I use annual contribution growth?
Use it when you expect your monthly deposits to rise over time, such as after salary increases, business expansion, or planned saving improvements.