Future Value Calculator
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What Your Result Means
- Future Value: The projected total balance at the end of the investment period, combining your starting amount, contributions, and compound interest.
- Total Contributions: The sum of your initial deposit plus all recurring contributions over the full time period — this is the money you actually put in.
- Total Interest Earned: The difference between the future value and your total contributions. This represents the growth generated purely by compound interest.
- Growth Factor: How many times your contributed dollars have multiplied. A factor of 2.0x means your money doubled; 1.5x means it grew by 50%.
How This Calculator Works
You enter a starting balance, an annual interest rate, the number of years, and optional recurring contributions. The tool applies the standard future value formula: FV = PV × (1 + r)^n for the lump sum, plus the future value of an annuity formula for contributions. It assumes a fixed rate with no taxes, fees, or inflation adjustment.
Quick Questions
What interest rate should I use?
It depends on the investment. High-yield savings accounts typically offer 4–5%, while historical stock market returns average roughly 7–10% annually before inflation. Use a conservative estimate for planning purposes.
Does compounding frequency really matter?
Yes, but the difference is often small. Monthly compounding earns slightly more than annual compounding at the same rate. The gap grows with higher rates and longer time horizons.
Does this account for inflation?
No. The result is in nominal (future) dollars. To estimate real purchasing power, subtract an assumed inflation rate (typically 2–3%) from your interest rate before calculating.
What is the time value of money?
It's the principle that a dollar today is worth more than a dollar in the future because today's dollar can earn interest. Future value calculations quantify exactly how much more today's dollar will be worth later.
Can I use this for retirement planning?
It's a useful starting point. For a more complete picture, you'd also want to factor in taxes, varying contribution amounts, employer matching, and inflation — which a dedicated retirement calculator handles.
Sources
- SEC Investor.gov — Compound Interest Calculator (official compound interest reference)
- CFPB — Save for Retirement (retirement savings guidance)
- Wikipedia — Future Value (future value formula derivation)
Method & review
Estimate only. Results reflect your inputs and standard formulas. Double-check important decisions independently.