Compound Interest Calculator

How to calculate your interest

To begin your calculation, enter your starting amount along with the annual interest rate and the start date (assuming it isn’t today). Then, enter a number of years, months or days that the calculation is to run. Once you click the ‘calculate’ button, the simple interest calculator will show you:

  • The interest accrued
  • Your final value
  • The split of final value


Compound Interest Formula With Examples

Simple interest calculator formula

Our calculator uses the following formula:

FV = P(1 + rt)


  • FV = Final value (principal + interest)
  • P = Principal (starting amount)
  • r = Annual interest rate (as decimal)
  • t = time period (in years)

Should you wish to work out the total interest only, simply calculate FV – P.


Example interest calculation

If an amount of $5,000 is invested at a yearly interest rate of 5%, with no compounding (simple interest), its value after 3 years can be calculated as follows…

P = 5000.
r = 5/100 = 0.05 (decimal).
t = 3.

Plugging those figures into the formula gives the following:

FV = 5000 * (1 + (0.05 * 3))

FV = 5000 * 1.15 = 5750

The balance after 3 years is therefore 5,750.





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