Investment Growth Calculator
Calculate how your investments grow over time with compound returns and inflation-adjusted projections.
Your Investment
Market Assumptions
Inflation Sensitivity
See how different inflation rates affect your purchasing power
Yearly Breakdown
| Year | Nominal Value | Real Value | Contributions | Interest |
|---|---|---|---|---|
| 1 | 1,650,000 | 1,617,647 | 600,000 | 50,000 |
| 2 | 2,332,500 | 2,241,926 | 600,000 | 132,500 |
| 3 | 3,049,125 | 2,873,259 | 600,000 | 249,125 |
| 4 | 3,801,581 | 3,512,073 | 600,000 | 401,581 |
| 5 | 4,591,660 | 4,158,808 | 600,000 | 591,660 |
| 6 | 5,421,243 | 4,813,909 | 600,000 | 821,243 |
| 7 | 6,292,305 | 5,477,831 | 600,000 | 1,092,305 |
| 8 | 7,206,921 | 6,151,037 | 600,000 | 1,406,921 |
| 9 | 8,167,267 | 6,834,004 | 600,000 | 1,767,267 |
| 10 | 9,175,630 | 7,527,213 | 600,000 | 2,175,630 |
Monthly Breakdown (First 12 Months)
| Month | Nominal Value | Real Value | Contributions | Interest |
|---|---|---|---|---|
| 1 | 1,054,074 | 1,052,336 | 50,000 | 4,074 |
| 2 | 1,108,369 | 1,104,716 | 50,000 | 8,369 |
| 3 | 1,162,884 | 1,157,141 | 50,000 | 12,884 |
| 4 | 1,217,622 | 1,209,611 | 50,000 | 17,622 |
| 5 | 1,272,583 | 1,262,126 | 50,000 | 22,583 |
| 6 | 1,327,767 | 1,314,686 | 50,000 | 27,767 |
| 7 | 1,383,177 | 1,367,291 | 50,000 | 33,177 |
| 8 | 1,438,812 | 1,419,942 | 50,000 | 38,812 |
| 9 | 1,494,674 | 1,472,639 | 50,000 | 44,674 |
| 10 | 1,550,763 | 1,525,382 | 50,000 | 50,763 |
| 11 | 1,607,081 | 1,578,172 | 50,000 | 57,081 |
| 12 | 1,663,629 | 1,631,009 | 50,000 | 63,629 |
How It Works
This calculator projects the future value of your investments using compound returns, then adjusts for inflation to show the real purchasing power.
- P — Initial investment
- r — Expected annual return (as a decimal)
- t — Investment period (years)
- PMT — Annual contribution (monthly × 12)
The real value shows what your future money is worth in today's purchasing power after accounting for inflation.
Example
If you invest ¥1,000,000 and add ¥50,000/month for 20 years at 6%: nominal value is ¥23.3M, but after 2% inflation it is worth ¥15.7M in today's money. Inflation cuts ~33% of the purchasing power.
This calculator runs entirely in your browser. No data is sent to any server.
Disclaimer
This is for informational and educational purposes only. Past performance does not guarantee future results.
Investment Growth Calculator: Guide
- Intent
- Project investment growth with inflation-adjusted real returns. See both nominal and real (inflation-adjusted) future values side by side.
- What it does
- Calculates nominal and inflation-adjusted (real) future values of an investment with monthly contributions, showing both side by side.
- Key features
- Nominal value projection, Inflation-adjusted real value, Yearly breakdown table, Contributions vs growth breakdown
- Privacy
- Everything runs locally in your browser. No data is uploaded.
- Best for
- Understanding the real purchasing power of future savings after inflation
- Planning retirement with realistic inflation-adjusted projections
- Comparing nominal returns vs actual spending power
- Why this tool
- Shows nominal and real values side by side for clear comparison
- Yearly breakdown helps visualize the impact of inflation over time
- Local-only: no sensitive data uploads
How to use
- 1Enter your initial investment and monthly contribution.
- 2Set your expected annual return rate and expected inflation rate.
- 3Choose your investment period in years.
- 4Review the nominal vs real value comparison and yearly table.
Common mistakes
- Inflation rates are historical averages; actual future inflation will vary.
- Expected returns are not guaranteed; past performance does not predict future results.
- This calculator does not include taxes, fees, or trading costs.