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Calculators :: Financial :: Compound Interest Calculator

Compound Interest is calculated on the initial payment and also on the interest of previous periods.

Example: Suppose you give \$100 to a bank which pays you 10% compound interest at the end of every year. After one year you will have \$100 + 10% = \$110, and after two years you will have \$110 + 10% = \$121.

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Compound Interest Calculator

Enter principal, interest rate and time to calculate how much money you will get at the end of the investment time. The calculator will generate explanation on how to find interest.

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Select variable you want to find and enter known variables. The calculator will find unknown variable and it will generate an explanation on how the calculation is done.

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Compound Interest Problems

This is a list of the example problems which can be solved by using this calculator.

Problems with unknown interest and amount

Example 1: What will a deposit of \$4,500 at 7% compounded yearly interest be worth if left in the bank for 9 years?

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Example 2: What will a deposit of $3,500 at 10% compounded monthly be worth if left in the bank for 8 years?

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Problems with unknown principal

Example 3: How much money would you need to deposit today at 8% annual interest compounded monthly to have \$1200 in the account after 12 years?

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Example 4: Find the present value of \$1,000 to be received at the end of 2 years at a 12% nominal annual interest rate compounded quarterly.

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Problems with unknown interest rate

Example 5: What annual interest rate is implied if you lend someone $1,700 and are repaid $1,910 in two years?

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Example 6: Suppose that a savings account is compounded monthly with a principal of \$1350. After 8 months, the amount increased to \$1424. What was the per annum interest rate?

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Example with unknown time period

Example 7: How long does it take for \$4,300 to grow into \$2,720 at 9% compounded quarterly?

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