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Compound Interest Calculator

See exactly how much your money grows over time — and how much faster it compounds with regular contributions.

✓ Formula verified June 2026✓ 30 currencies✓ No signup required
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Annual rate

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Investment period

Regular Contributions

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Scenario B

Worked Examples

The 30-year retirement plan

$10,000 invested at 7% compounded monthly for 30 years grows to $81,165. The interest earned ($71,165) is 7× the original investment — a result of patience, not luck.

UAE savings account at 3.5%

AED 50,000 in a UAE savings account at 3.5% compounded annually for 10 years becomes AED 70,530. Even at lower rates, compounding still adds AED 20,530 without additional deposits. Planning to leave your UAE job? Calculate your end-of-service benefit with the UAE Gratuity Calculator.

Doubling time — the Rule of 72

At 6% compounded annually, your money doubles every 12 years (72 ÷ 6 = 12). At 9%, it doubles every 8 years. The difference of 3 percentage points halves the time to double.

Frequently Asked Questions

~6 min read
What is compound interest?▾
Compound interest is interest calculated on both your initial principal and the accumulated interest from previous periods. Unlike simple interest (which only applies to the principal), compound interest grows exponentially — the longer you wait, the faster it grows.
How often should interest compound?▾
The more frequently interest compounds, the more you earn. Daily compounding yields slightly more than monthly, which yields more than annually. For most savings accounts and mortgages, monthly compounding is standard.
What is the compound interest formula?▾
A = P(1 + r/n)^(nt), where A is the final amount, P is the principal, r is the annual interest rate as a decimal, n is the number of times interest compounds per year, and t is the number of years.
What is doubling time?▾
The Rule of 72 estimates how long it takes to double your money: divide 72 by the annual interest rate. At 6%, your money doubles in approximately 12 years (72 ÷ 6 = 12).
Is compound interest the same as APY?▾
APY (Annual Percentage Yield) accounts for compounding effects within a year. If a savings account has a 5% annual rate compounded monthly, the APY is slightly higher at ~5.12%. Calcureal shows the true compounded result directly.
Can I use this for UAE dirhams (AED)?▾
Yes. The formula works for any currency. The calculator will display results in AED if your device is detected as being in the UAE, or you can switch currency manually.
Can I model regular deposits or withdrawals?▾
Yes — switch the 'Regular Contributions' toggle to Deposits, Withdrawals, or Both. You can also set an annual deposit increase (by % or fixed amount) to model salary-linked contributions.
What is APY vs nominal rate?▾
The nominal rate is the stated annual interest rate. APY (Annual Percentage Yield) is the effective rate after accounting for compounding frequency within the year. A 5% nominal rate compounded monthly gives a 5.12% APY. Calcureal displays both.

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For informational purposes only. Not financial advice. Consult a qualified financial advisor before making investment decisions. Formula last verified June 2026. See our Privacy Policy for data handling.