Weigh the newspaper and write the weight in pounds. This is important because the gross caloric value is measured in Btu/lbs.
Multiply the value from the previous step by 7,540 in order to determine the number of Btus obtained by burning the quantity of newspaper. This is the mean gross-caloric value for newspaper, and it represents the energy liberated by a single pound.
Calculate to convert the Btu value into the preferred unit for measuring energy. Use an online calculator or convert using this formula: 1 Btu = 252.164401 Calories.