Investment Return Calculator
Estimate the future value of any investment by entering your starting balance, regular contributions, expected annual return, and time horizon. See total gains, ROI, and a year-by-year breakdown instantly in your browser.
Future Value
$20,096.61
Total Invested
$10,000.00
Net Gain
$10,096.61
ROI
101.0%
| Year | Balance | Invested | Gain |
|---|---|---|---|
| 1 | $10,722.90 | $10,000.00 | $722.90 |
| 2 | $11,498.06 | $10,000.00 | $1,498.06 |
| 3 | $12,329.26 | $10,000.00 | $2,329.26 |
| 4 | $13,220.54 | $10,000.00 | $3,220.54 |
| 5 | $14,176.25 | $10,000.00 | $4,176.25 |
| 6 | $15,201.06 | $10,000.00 | $5,201.06 |
| 7 | $16,299.94 | $10,000.00 | $6,299.94 |
| 8 | $17,478.26 | $10,000.00 | $7,478.26 |
| 9 | $18,741.77 | $10,000.00 | $8,741.77 |
| 10 | $20,096.61 | $10,000.00 | $10,096.61 |
Quick answer
An investment return calculator computes how much an investment will grow over time using compound interest. Enter the initial principal, any recurring contributions, the expected annual interest rate, and the number of years. The calculator applies the compound interest formula to produce a final future value, total amount invested, net gain, and return on investment (ROI) percentage. For example, export const batch4Tools: ToolContent[] = 0,000 invested at 7% per year for 10 years grows to approximately export const batch4Tools: ToolContent[] = 9,672—a gain of $9,672 with no additional contributions.
Formula & method
FV = P × (1 + r)^n + C × [(1 + r)^n − 1] / r
- FV — Future value (total balance at end of period)
- P — Principal (initial investment)
- C — Periodic contribution amount (monthly or annual)
- r — Interest rate per compounding period (annual rate ÷ 12 for monthly)
- n — Total number of compounding periods (years × 12 for monthly)
Future value with lump-sum principal P and periodic contributions C, where r is the rate per period and n is the total number of periods. When C = 0 this reduces to the basic compound-interest formula.
ROI = (FV − Total Invested) / Total Invested × 100%
- ROI — Return on investment (%)
- FV — Future value
- Total Invested — Principal plus all periodic contributions made
Return on investment expresses the net gain as a percentage of the total capital contributed.
Examples
- Input
- principal: 10000 | monthlyContribution: 0 | annualRate: 7 | years: 10
- Result
- Future Value: export const batch4Tools: ToolContent[] = 9,671.51 | Net Gain: $9,671.51 | ROI: 96.7%
- Why
- Using FV = 10,000 × (1.07)^10 = 10,000 × 1.96715 = export const batch4Tools: ToolContent[] = 9,671.51. The export const batch4Tools: ToolContent[] = 0,000 lump sum nearly doubles over 10 years at a 7% annual return with no additional contributions, demonstrating the power of long-term compounding.
- Input
- principal: 5000 | monthlyContribution: 200 | annualRate: 6 | years: 20
- Result
- Future Value: export const batch4Tools: ToolContent[] = 08,959.20 | Total Invested: $53,000 | Net Gain: $55,959.20 | ROI: 105.6%
- Why
- Monthly rate = 6% / 12 = 0.5%. Lump-sum portion: 5,000 × (1.005)^240 = export const batch4Tools: ToolContent[] = 6,550.68. Annuity portion: 200 × [(1.005)^240 − 1] / 0.005 = $92,408.52. Total = export const batch4Tools: ToolContent[] = 08,959.20. The $53,000 invested more than doubles, with compounding interest generating over $55,959 in gains.
- Input
- principal: 50000 | monthlyContribution: 0 | annualRate: 4 | years: 5
- Result
- Future Value: $60,832.65 | Net Gain: export const batch4Tools: ToolContent[] = 0,832.65 | ROI: 21.7%
- Why
- FV = 50,000 × (1.04)^5 = 50,000 × 1.21665 = $60,832.65. A conservative 4% annual return on a $50,000 bond portfolio produces over export const batch4Tools: ToolContent[] = 0,800 in gains over 5 years—solid growth with lower risk than equities.
- Input
- principal: 1000 | monthlyContribution: 500 | annualRate: 8 | years: 30
- Result
- Future Value: $756,115.45 | Total Invested: export const batch4Tools: ToolContent[] = 81,000 | Net Gain: $575,115.45 | ROI: 317.7%
- Why
- Monthly rate = 8% / 12 ≈ 0.6667%. Lump-sum: 1,000 × (1.006667)^360 = export const batch4Tools: ToolContent[] = 0,935.73. Annuity: 500 × [(1.006667)^360 − 1] / 0.006667 = $745,179.72. Total = $756,115.45. Consistent $500/month contributions over 30 years turn export const batch4Tools: ToolContent[] = 81,000 in contributions into over $756,000—a 317.7% ROI illustrating the transformative effect of time and compounding.
Frequently asked questions
What is a realistic annual return rate to use?
Historically, the US stock market (S&P 500) has averaged roughly 7–10% annually before inflation. A conservative diversified portfolio might use 5–6%, while an aggressive all-equity portfolio may use 8–10%. Bond-heavy portfolios typically range from 3–5%. Adjust the rate to match your actual investment allocation and risk tolerance.
How does compound interest differ from simple interest?
Simple interest earns returns only on the original principal. Compound interest earns returns on both the principal AND the accumulated interest, so your gains snowball over time. For example, export const batch4Tools: ToolContent[] = 0,000 at 7% simple interest for 10 years gives export const batch4Tools: ToolContent[] = 7,000, while compound interest gives export const batch4Tools: ToolContent[] = 9,671—a $2,671 difference from compounding alone.
Should I use monthly or annual compounding?
Monthly compounding is more accurate for most modern investment accounts, savings accounts, and 401(k)s where contributions and interest accrue monthly. Annual compounding is simpler and roughly equivalent for long horizons. This calculator uses monthly compounding when you enter monthly contributions, and annual compounding for lump-sum-only scenarios.
Does this calculator account for taxes or inflation?
No—this calculator shows nominal, pre-tax returns. To estimate real (inflation-adjusted) returns, subtract the expected inflation rate (historically ~2–3%) from your annual rate input. For example, enter 5% instead of 7% to approximate a 2% inflation environment. Tax treatment varies by account type (taxable, IRA, 401k) and is outside this tool's scope.
What is ROI and how is it calculated here?
ROI (Return on Investment) is the net gain expressed as a percentage of total capital invested. The formula is: ROI = (Future Value − Total Invested) / Total Invested × 100%. Total Invested = your initial principal plus all periodic contributions you made over the time horizon. A 100% ROI means you doubled your money.
How can I maximise my investment returns?
The biggest levers are: (1) Start early—time is the most powerful factor due to compounding. (2) Contribute consistently—even small monthly additions compound significantly over decades. (3) Minimise fees—a 1% annual expense ratio can reduce a 30-year portfolio by 25%+. (4) Diversify—broad index funds reduce single-stock risk. (5) Reinvest dividends—this is already captured in a total-return rate assumption.
Sources & references
- https://www.investor.gov/financial-tools-calculators/calculators/compound-interest-calculator
- https://www.sec.gov/investor/tools/mfcc/get-started.htm
- https://www.investopedia.com/terms/c/compoundinterest.asp
External references open in a new tab. We are independent and not affiliated with these organizations.
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- ✓ Formula and method shown above
Provided “as is” for general information only — results may be inaccurate, so verify before you rely on them. No warranty; use at your own risk.
Built and reviewed by HIFreeTools against the formula shown above and any authoritative references cited on this page. See our methodology and editorial standards.
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