In this box, enter the numerical value of the input, expressed in terms of the original units. In this case, we want to convert 20,000 BTU/lb, so we enter "20000" For examples, click here or on the "Examples" link from the Unit Conversion home page. In the Excel add-in, this box can be used to select a cell containing the numerical input.
The image below is clickable... click on any feature to see an explanation of its use.