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Commerce · September 1, 2026

CompoundFX: Compound Interest Calculator

Know what you’ll have and what it takes to get there.

What it does

CompoundFX goes beyond a basic compound interest calculator. Project investment growth or set a goal, like $1M by age 60, and solve for the rate, time, starting principal, or contribution needed to get there. Compare scenarios, account for inflation, taxes, and fees, and explore interactive charts and year-by-year results. The web calculator is free and private, with no sign-up required.

Compound interest is interest on your deposit plus past interest. Project your growth with this free compound interest calculator — private, no sign-up.

Compound interest is interest calculated on your initial deposit plus all previously earned interest. Because each period's interest is added to the balance before the next calculation, your money grows exponentially rather than linearly. Monthly contributions compound monthly, so the frequency is locked to monthly while you're contributing. The Power of Compounding You contributed $82,000 but earned $243,159 in interest. Unlock unlimited scenarios, goal planning, and PDF reports with CompoundFX. Free to download. Optional one-time Pro upgrade. No subscription. Unlike simple interest, compound interest earns interest on both your initial investment and the interest that accumulates over…from compound-interest-calculator.app

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