Engine Efficiency
This calculator computes engine thermal efficiency (ηth) based on specific fuel consumption (sfc). It also works the other way around, to calculate sfc based on the ηth value. The relationship between these parameters is explained in the Technology Guide paper on Engine Fundamentals.
Enter a number in any field and hit “Enter”—or click anywhere outside the field—to complete the calculation. An asterisk (*) will appear if your data is out of range.