Investing
Investment Calculator
Model where consistent investing leads. Enter a starting amount, a monthly contribution, and an expected return to project your portfolio's value over time — split between the money you put in and the growth the market added, with a year-by-year table of the journey.
The S&P 500 has averaged ~10% nominal over the long run; diversified portfolios less. Fees subtract directly.
Projected portfolio value
$548,915
- Money you invested
- $160,000
- Market growth
- $388,915
- Share of final value from growth
- 70.85%
Past ~20 years, compounding usually contributes more than you do.
Portfolio by year
| Year | Value | Invested | Growth |
|---|---|---|---|
| 1 | $17,055 | $16,000 | $1,055 |
| 2 | $24,695 | $22,000 | $2,695 |
| 3 | $32,970 | $28,000 | $4,970 |
| 4 | $41,932 | $34,000 | $7,932 |
| 5 | $51,637 | $40,000 | $11,637 |
| 6 | $62,148 | $46,000 | $16,148 |
| 7 | $73,531 | $52,000 | $21,531 |
| 8 | $85,859 | $58,000 | $27,859 |
| 9 | $99,210 | $64,000 | $35,210 |
| 10 | $113,669 | $70,000 | $43,669 |
| 11 | $129,329 | $76,000 | $53,329 |
| 12 | $146,288 | $82,000 | $64,288 |
| 13 | $164,655 | $88,000 | $76,655 |
| 14 | $184,546 | $94,000 | $90,546 |
| 15 | $206,088 | $100,000 | $106,088 |
| 16 | $229,419 | $106,000 | $123,419 |
| 17 | $254,685 | $112,000 | $142,685 |
| 18 | $282,049 | $118,000 | $164,049 |
| 19 | $311,684 | $124,000 | $187,684 |
| 20 | $343,778 | $130,000 | $213,778 |
| 21 | $378,537 | $136,000 | $242,537 |
| 22 | $416,180 | $142,000 | $274,180 |
| 23 | $456,948 | $148,000 | $308,948 |
| 24 | $501,099 | $154,000 | $347,099 |
| 25 | $548,915 | $160,000 | $388,915 |
How this calculator works
Growth compounds monthly at your expected return with contributions at month-end, in exact cents — a standard deterministic projection. Real portfolios experience volatility and sequence-of-returns risk that a single-rate model cannot show.
Results are pre-tax and pre-inflation. Long-horizon planning in today's dollars: use a real return (nominal minus ~3%).
Try an example
Frequently asked questions
What return should I expect from investing?
US large-cap stocks have averaged about 10% a year nominal (roughly 7% after inflation) over the past century — with brutal individual years on both sides. Diversified stock/bond portfolios land lower. Model 6–8%, subtract your fund fees, and treat anything above as upside.
Is a smooth average return realistic?
No single year is average — markets lurch (+30% one year, −20% another) and only average out over decades. A constant-return projection is the right planning tool for long horizons, but expect the real path to be jagged. That's the price of the returns.
What is dollar-cost averaging?
Investing a fixed amount on a schedule regardless of prices — exactly what the monthly contribution here models. You automatically buy more shares when prices are low and fewer when high, and more importantly, you remove timing decisions that most investors get wrong.
How much do fees matter?
Enormously at scale: a 1% annual fee on an 8% return doesn't cost 1% — it compounds. Over 30 years it can consume a quarter of the final balance. Re-run this calculator at 7% vs 8% to see your own number; broad index funds under 0.1% make the problem nearly vanish.
Should I invest a lump sum or spread it out?
Historically, investing a windfall immediately beats spreading it out about two-thirds of the time (markets rise more often than they fall). Spreading over 6–12 months trades a bit of expected return for regret protection — a reasonable, human choice.
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Disclaimer: DayCents provides this calculator for educational purposes only. Results are estimates based on your inputs and the stated assumptions — they are not financial advice, a quote, or an offer of credit. Consult a qualified financial professional before making major money decisions.