Geometric Mean Calculator - Fecal Coliform Reporting. Wastewater Sludge (biosolids) Production Estimating Calculator . TNTC Calculation . Nitrification - Alkalinity ... Fractions Calculator. This page is about converting a fraction (i.e. a ratio of two numbers, also called a rational number) into a decimal fraction and the patterns that occur in such a decimal fraction. Combine standard function types using arithmetic operations