Investment Calculator
Calculate how your investments can grow over time. Model different scenarios with varying contribution amounts, return rates, and time horizons to plan for your financial goals.
Formula:FV = PV(1+r)^n + PMT × [(1+r)^n - 1] / r
Investment Projection
Future Value
$343,778
Total Interest
$213,778
164% gain
Total Contributions$130,000
Inflation-Adjusted Value$190,342
Effective Annual Return19.3%
Value Breakdown
Initial$10,000
Contributions$120,000
Interest Earned$213,778
Investment Goal
Select a preset or customize your plan
Initial Investment
Your starting balance
0100,000
Monthly Contributions
Regular deposits to your investment
05,000
Annual contribution: $6,000
Growth Parameters
Expected returns and time horizon
8%
1%15%
20 years
1 years50 years
3%
0%10%
Portfolio Growth Over Time
Visual projection of your investment growth
Yearly Breakdown
Year-by-year investment projections
| Year | Balance | Contributions | Interest | Inflation Adjusted |
|---|---|---|---|---|
| 1 | $17,055 | $16,000 | $1,055 | $16,558 |
| 3 | $32,970 | $28,000 | $4,970 | $30,172 |
| 5 | $51,637 | $40,000 | $11,637 | $44,542 |
| 7 | $73,531 | $52,000 | $21,531 | $59,787 |
| 9 | $99,210 | $64,000 | $35,210 | $76,036 |
| 11 | $129,329 | $76,000 | $53,329 | $93,430 |
| 13 | $164,655 | $88,000 | $76,655 | $112,122 |
| 15 | $206,088 | $100,000 | $106,088 | $132,280 |
| 17 | $254,685 | $112,000 | $142,685 | $154,089 |
| 19 | $311,684 | $124,000 | $187,684 | $177,749 |
| 20 | $343,778 | $130,000 | $213,778 | $190,342 |
Investment Strategy Tips
Best practices for growing your wealth
Start Early
Time is your greatest asset. Starting 10 years earlier can double your ending balance due to compound growth.
Stay Consistent
Regular monthly contributions build wealth steadily. Even small amounts add up significantly over time.
Diversify
Spread investments across asset classes to reduce risk while maintaining growth potential.
Keep Costs Low
High fees compound too - against you. A 1% fee can cost hundreds of thousands over a lifetime.
What if you invested more monthly?
$0$500$5,000
Future Value
$343,778
Personalized Insights
2 insights based on your inputs
Compound Growth Working
Your investment earnings ($213,778) exceed total contributions!
Long-Term Power
With 20 years of growth, compound interest does the heavy lifting. Time is your greatest asset.
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Frequently Asked Questions
An investment calculator helps you project how your money can grow over time based on initial investment, regular contributions, expected return rate, and time horizon. It uses compound growth formulas to estimate future portfolio value, helping you plan for financial goals.
Historically, the S&P 500 has averaged about 10% annually before inflation (7% after). However, returns vary by investment type: stocks (8-12%), bonds (4-6%), real estate (8-12%), savings accounts (1-4%). Conservative estimates use 6-7%, aggressive use 8-10%.
Inflation reduces the purchasing power of your money over time. At 3% inflation, $100,000 in 20 years buys what $55,000 does today. Real returns = nominal returns minus inflation. A 7% return with 3% inflation gives 4% real return.
Statistically, lump sum investing outperforms dollar-cost averaging about 2/3 of the time because markets tend to rise. However, DCA reduces risk of investing at a market peak and provides psychological comfort. For most people, regular monthly investing through DCA is practical and effective.
A common guideline is to invest 10-20% of your gross income. At minimum, contribute enough to get your employer 401k match (typically 3-6%). The 50/30/20 rule suggests 20% for savings/investments. Start with what you can afford and increase over time.
Compound growth means earning returns on your returns. $10,000 growing at 8% becomes $21,589 in 10 years and $46,610 in 20 years - more than doubling in the second decade due to compounding. Time is the most important factor in wealth building.
How this works
Calculations are run entirely in your browser. No inputs are sent to our servers and no account is required. Formulas follow standard US definitions from the IRS and the CFPB where applicable; international users should confirm local tax and regulatory rules apply.
What this tool can’t do
When to consult a professional
This is a software engineering tool, not financial advice. Run the math here, then take the result to a certified financial planner, CPA, or your bank before making a decision that materially affects your money.
Sources
- [1]Consumer Financial Protection Bureau (CFPB)Official sourceconsumerfinance.govAccessed Apr 21, 2026
US consumer finance regulator; authoritative on mortgage disclosures, APR rules, credit cards.
Joseph OrdunaFounder & Software Engineer
Full-stack software engineer specializing in embedded systems, web architecture, and AI/ML. Founder of Practical Web Tools. Built the gesture-controlled drone IP acquired by KD Interactive (Aura Drone, sold on Amazon).
Investment Projection
Future Value
$343,778
Total Interest
$213,778
164% gain
Total Contributions$130,000
Inflation-Adjusted Value$190,342
Effective Annual Return19.3%
Value Breakdown
Initial$10,000
Contributions$120,000
Interest Earned$213,778