See how your investments could grow over time. Enter your initial investment, monthly contributions, and expected return rate to project your portfolio value. Includes dividend income tracking and reinvestment options.
Investment returns are how money grows in a portfolio over time. Unlike a savings account paying fixed interest, real-world investments combine price appreciation, dividend income, and the compounding of reinvested distributions. The math projects forward what a starting balance plus regular contributions could become if returns continue at an assumed rate.
This calculator models initial investment + monthly contributions over a chosen time horizon, with separate handling for dividend yield and a toggle for dividend reinvestment. The output shows final portfolio value, contributions vs growth split, and the long-term effect of reinvestment.
Historical context: the S&P 500 has returned about 10% nominal (7% real after inflation) per year over the last century. Bond-heavy portfolios return 4–6%. International stocks have returned similar to U.S. stocks long-run but with different decade-by-decade winners. Diversified balanced portfolios (60/40 stocks/bonds) typically return 7–8% nominal.
Any single-rate projection hides the variability: actual annual returns swing from −37% (2008) to +37% (1995). Plan for averages but expect any particular year to differ substantially.
$5K initial + $400/mo for 30 years at 8% return + 2% dividend reinvested. Final balance: ≈ $810,000 Total contributions: $149,000 Growth: $661,000 (82% of final balance) The "magic" of compounding shows up in the final decade — about half the total growth happens after year 20.
Same scenario but front-loaded losses: −30%, −5%, +20% for first 3 years, then 8% steady. Final balance: ≈ $590,000 The math averages can be the same, but early losses (especially on a high starting balance) cost dramatically. Sequence-of-returns risk is the biggest hidden risk in early retirement.
Use this for long-horizon investment planning: retirement accumulation, financial-independence targets, college savings, generational wealth modeling.
Important caveats: - A constant assumed return doesn't capture market volatility. Real outcomes vary by 30%+ depending on the actual sequence of returns over your time horizon. - Returns shown are pre-tax. Long-term capital gains and qualified dividends get preferential rates (0/15/20%); ordinary dividends and short-term gains get regular brackets. - The calculator uses nominal returns. To plan in today's dollars, subtract inflation (typically 3%). - Real-world investing has costs: expense ratios, trading fees, advisor fees. A 1% advisor fee compounded over 30 years can consume 25%+ of the final balance.
For specific account types or strategies, see compound interest (basic math), retirement savings (with retirement-specific framing), or 401(k) calculator (employer match modeling).
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Final Balance
$456,990
Total Growth
$326,990
Total Contributions
$130,000
Total Dividends
$65,311
| Year | Balance | Contributions | Growth | Dividends |
|---|---|---|---|---|
| 1 | $17,384.19 | $16,000.00 | $1,384.19 | $276.47 |
| 2 | $25,542.69 | $22,000.00 | $3,542.69 | $707.59 |
| 3 | $34,556.67 | $28,000.00 | $6,556.67 | $1,309.59 |
| 4 | $44,515.86 | $34,000.00 | $10,515.86 | $2,100.37 |
| 5 | $55,519.35 | $40,000.00 | $15,519.35 | $3,099.74 |
| 6 | $67,676.67 | $46,000.00 | $21,676.67 | $4,329.56 |
| 7 | $81,108.79 | $52,000.00 | $29,108.79 | $5,814.01 |
| 8 | $95,949.38 | $58,000.00 | $37,949.38 | $7,579.77 |
| 9 | $112,346.16 | $64,000.00 | $48,346.16 | $9,656.36 |
| 10 | $130,462.28 | $70,000.00 | $60,462.28 | $12,076.35 |
| 11 | $150,478.05 | $76,000.00 | $74,478.05 | $14,875.78 |
| 12 | $172,592.65 | $82,000.00 | $90,592.65 | $18,094.40 |