Calculate the future value of an investment with or without regular contributions. Shows the power of compounding over time.
Investment Details
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Future Value
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Total Gain
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Future Value
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Total Contributed
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Interest Earned
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Return Multiple
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Initial Investment
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Regular Contributions
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Total Contributed
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Interest Earned
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Future Value
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Return Multiple
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FAQ
How is future value calculated?
FV = PV × (1+r)^n + PMT × [(1+r)^n − 1] / r. Where PV = present value, r = period rate, n = total periods, PMT = regular payment. Compounding frequency matters significantly.
What is the rule of 72?
Divide 72 by the annual interest rate to estimate years to double. At 8%: 72/8 = 9 years to double. At 6%: 72/6 = 12 years. It's a quick mental math estimation.
Why does compounding frequency matter?
Monthly compounding grows faster than annual. $10,000 at 8% for 20 years: Annual = $46,610. Monthly = $49,268. Daily = $49,530. More frequent compounding = slightly higher returns.
Small contributions make a huge difference over time — how?
Due to compound interest, $500/month at 8% for 20 years becomes $294,510 — but you only contributed $120,000. The extra $174,510 is pure compound interest. Starting early multiplies this effect dramatically.