7 pasos para calcular el ROI en tu estrategia de Social Media / 7 Steps to calculating the ROI of your SM
How to calculate Lifetime Value of a customer: Starbucks case study – Infographic by KissMetrics
Compound interest is a simple math formula. (Trying to beat interest rates and S&P annually)
Celsius and Fahrenheit conversion charts with an easy-to-remember formula.
Calorie calculator based on your height and weight = the calories you need daily