Free compound interest calculator with monthly contributions. See how your money grows over time with daily, monthly, quarterly, or annual compounding. Includes visual growth chart, year-by-year breakdown table, Rule of 72, and compounding frequency comparison.
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Compound interest is interest calculated on both the initial principal and accumulated interest from previous periods. It makes your money grow exponentially over time.
A = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) - 1) / (r/n)], where P is principal, r is annual rate, n is compounding frequency, t is years, and PMT is periodic contribution.
A quick way to estimate how long it takes to double your money: divide 72 by the annual interest rate. For example, at 8% interest, money doubles in approximately 9 years.
Yes! More frequent compounding (daily vs annually) yields slightly more interest. The calculator shows a comparison across all frequencies.
Using the Compound Interest Calculator is simple: visit the tool page, enter your data or input into the provided fields, and get instant results. No downloads, installations, or sign-ups are required. The tool runs directly in your web browser for maximum convenience.
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Free compound interest calculator with monthly contributions. See how your money grows over time with daily, monthly, quarterly, or annual compounding. Includes visual growth chart, year-by-year breakdown table, Rule of 72, and compounding frequency comparison.
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| Year | Deposits | Interest | Balance |
|---|---|---|---|
| 1 | $12,400.00 | $801.42 | $13,201.42 |
| 2 | $14,800.00 | $1,834.27 | $16,634.27 |
| 3 | $17,200.00 | $3,115.28 | $20,315.28 |
| 4 | $19,600.00 | $4,662.39 | $24,262.39 |
| 5 | $22,000.00 | $6,494.83 | $28,494.83 |
| 6 | $24,400.00 | $8,633.24 | $33,033.24 |
| 7 | $26,800.00 | $11,099.74 | $37,899.74 |
| 8 | $29,200.00 | $13,918.03 | $43,118.03 |
| 9 | $31,600.00 | $17,113.55 | $48,713.55 |
| 10 | $34,000.00 | $20,713.58 | $54,713.58 |