Compound vs Simple Interest 1 Compound vs. Simple Interest With compound interest your investment grows exponentially. You earn INTEREST on INTEREST! Enter your investment amount and the number of years you will let your investment grow. My investment amount. $ Number of years I will let my investment grow. Choose 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 Click here to produce graph October 16, 2014 Income CalulatorsInvestmentRetirement PlanningSavings Calulators Related Projects Income Calculator