Compound interest calculator with graph help

 Settings Remark Nominal interest rate (R) The nominal interest rate (R) is expressed as percentage (%) per year. The interest rate may contain max two digits after its decimal point. The interest rate entered may contain a comma (,) or point (.) as a decimal point separator. Correct entered interest rates 5.25 5,25 4 Incorrect entered interest rates 5.041 The nominal interest rate (R) is specified per year. If the time period (T) is set to another unit than year for example weeks, the calculator will adjust the time period accordingly. Example 1: How time period will be adjusted: Interest rate = 5% per year Time period = 7 weeks 52 weeks equals 1 year Thus 7 weeks equals 7/52 = 0.1346 years Example 2: How time period will be adjusted: Interest rate = 5% per year Time period = 2 quarters 4 quarters equals 1 year Thus 2 quarters equals 2/4 = 0.5 year Example 3: How time period will be adjusted: Interest rate = 5% year Time period = 5 bi-weeklies 26 bi-weeklies equals 1 year Thus 5 bi-weeklies equals 5/26 = 0.1923 year The compound interest equation: R = N * ((FV / P)1 / (N * T)   - 1) or R = N * ((I / P) + 1)1 / (N * T)   - 1) where: FV = Future value I = Interest amount P = Principal initial amount R = Nominal interest rate per year (as a decimal, not in percentage) T = Time period in years N = Number of compounding periods in one year