Personal Finance • Wealth Accumulation

Compound Interest & Investment Growth Calculator

Forecast how principal and regular monthly contributions compound into financial freedom over 5 to 40 years.

100% Free Online Real-Time Calculations Client-Side Privacy Guaranteed

Compound Interest & Investment Growth Calculator

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Check live exchange rates, 7-day trend sparklines, and international wire transfer spreads.

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How This Calculator Works & Financial Methodology

Where P is starting principal, r is annual return rate, n is compounding frequency, t is time in years, and PMT represents monthly contribution.

Compound Interest Formula

A = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) - 1) / (r/n)]

Frequently Asked Questions

What is the Rule of 72?
Divide 72 by your expected annual return percentage to approximate how many years it will take for your money to double (e.g. at 8% return, 72 / 8 = 9 years).
Does compounding frequency make a large difference?
Monthly compounding yields slightly higher returns than annual compounding because interest is credited and reinvested 12 times a year instead of once.
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