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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 (CI)** over a given period of time using different compounding frequencies viz., daily, monthly, quarterly, half-yearly and yearly.

You can solve for all four variables viz., **A**, **P**, **t** and **r** involved in compound interest calculation using this calculator.

**Ex 1.** What is the compound interest of 75000 at 7.9% per annum compounded annually in 5 years?

**Ans.** Accrued Amount: 109690.37, Total Interest: 34690.37

**Ex 2.** How much will I earn if I invest 1000 for 20 years at 8% interest rate compounded monthly?

**Ans.** Accrued Amount: 4926.8, Total Interest: 3926.8

**Ex 3.** In how many years will 10000 become 20000 at 10% interest rate compounded quarterly?

**Ans.** Solving for time period gives 7.02 year(s)

**Ex 4.** At what rate will 10000 become 20000 in 5 years with yearly compounding?

**Ans.** Solving for interest rate gives 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.

This calculator will help you visualize the power of compounding or compound annual growth rate (CAGR) when planning your finances.

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