Investment Calculator
Calculate future investment portfolio value, total return on investment (ROI), and annual compound growth with regular additions.
Input Parameters
Live Result
Details
Steps
Calculate total principal capital invested
Apply future value formula with monthly compound contributions
Extract pure compound investment growth yield
Quick Answer & Understanding Your Result
An Investment Calculator projects future investment portfolio valuation, total net profit, and compound annual growth rates (CAGR) across stocks, bonds, index funds, and real estate.
Core Investment Metrics
- Future Portfolio Value: Total market value of your invested capital at the end of the investment horizon.
- Return on Investment (ROI %): Total capital gain expressed as a percentage of total invested capital (ROI = Net Profit ÷ Invested × 100%).
- Dollar-Cost Averaging (DCA): Making systematic recurring monthly additions to lower average purchase price volatility.
Asset Allocation & Planning
- Stock Market Index Funds (S&P 500): Modeling historical 8% to 10% average annual returns over multi-decade horizons.
- Retirement Planning: Forecasting financial independence nest eggs across taxable and tax-advantaged accounts.
Enter initial investment, monthly contribution, expected annual return, and years above to simulate your investment growth instantly.
Formula & Calculation Logic
Mathematical FormulaPortfolio compounding rules:
- Accounts for compounding on initial capital P and recurring dollar-cost averaging deposits PMT.
- Calculates net capital gains by subtracting total cumulative cash contributions from final balance.
Step-by-Step Guide
Enter Starting Capital (P)
Input initial portfolio investment amount (e.g. $10,000).
Enter Monthly Addition & Return Rate
Input monthly recurring investment (e.g. $500) and expected annual return (e.g. 9%).
View Total Valuation & ROI
Receive final portfolio balance, net gains, and annualized ROI percentage.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| $10,000 Initial + $500/Month at 9% for 20 Years | Total cash invested = $130,000; compound gains generated $262,050.28 in profit. | ||
| $5,000 Initial + $1,000/mo @ 10% for 25 Years (S&P 500) | Provides instant quantitative evaluation for comparative practical analysis. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
US SEC - Investor.gov Compound Interest and Investment Planning
FINRA - Smart Investing Guidelines
Standard: ISO / W3C / IETF Authoritative Domain Standard
Formula: Future Value = P × (1 + r)ᵗ + PMT × [((1 + r/n)ⁿᵗ - 1) / (r/n)]
Last Reviewed: August 21, 2026
Primary Source: US SEC - Investor.gov Compound Interest and Investment Planning
Reference Document: FINRA - Smart Investing Guidelines
Computation Privacy: 100% client-side 0ms computation, zero data retention
Calculated financial results are modeled based on standard financial and mathematical formulas. For actual contracts or commercial loans, official amortizations will depend on lender-specific terms, fees, and regulatory provisions.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.