Calculators » Finance » Compound Interest

Compound Interest Calculator

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.



Annual Interest Rate (%):

Time Period:

Compounding Interval:

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

Sample calculations

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%

Compound interest formula

The formula for compound interest:
A = P(1+r/n)⌊nt⌋
CI = A-P
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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