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Calculators » Finance » Compound Interest

Our online tools will provide quick answers to your calculation and conversion needs. On this page, you can calculate **compound interest** over a given period of time using different compounding intervals viz., daily, monthly, quarterly, half-yearly and yearly.

Android: Use this compound interest calculator offline with our all-in-one calculator app.

**Ex 1.** What is the compound interest of 75000 at 7.9% per annum compounded semi-annually in 3 years?

**Ans.** Set Principal = 75000, Time period = 3 years, Compounded Half-yearly. Pressing calculate gives you Accrued Amount: 94625.51, Total Interest: 19625.51

**Ex 3.** In how many years will a amount double itself at 10% interest rate compounded quarterly?

**Ans.** Select "solve for time period". Set Amount = 2, Principal = 1, Interest rate = 10%, Compounded Quarterly. On pressing calculate, you get the answer which is 7.02 year(s)

**Ex 4.** If interest is compounded annually, find the rate at which a amount doubles itself in 5 years?

**Ans.** Select "solve for interest rate". Set Amount = 2, Principal = 1, Time Period = 5 years, Compounded Yearly. On pressing calculate, you get the answer which is 14.87%

The formula for compound interest:

A = P(1+r/n)^{⌊nt⌋}

CI = A-P

Where,

CI = Compound Interest

A = Final amount

P = Principal (Initial Investment)

t = Total time in years

n = Number of compounding periods per year

r = Annual interest rate

⌊nt⌋ means that nt is rounded down to the nearest integer.

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