ESALs Calculator calculates the Equivalent Standard Axle Load. The Equivalent Standard Axle Load (ESAL) formula is used to calculate the Traffic Load Equivalency Factor (also known as the ESALs) based on the load magnitude, load repetitions, and structural coefficient. The formula for ESAL calculation is as follows:

ESALs = (Load Magnitude × Load Repetitions) / Structural Coefficient

Where:

• ESALs is the Traffic Load Equivalency Factor, representing the equivalent number of standard 18,000 lb (80 kN) single axle loads.
• Load Magnitude is the weight of the axle or load (in pounds).
• Load Repetition is the number of times that a particular axle or load passes over the pavement during its design life.
• Structural Coefficient is a factor that accounts for the relative damage caused by different types of axles.

This formula allows pavement engineers to estimate the pavement distress caused by various traffic loads by converting them into equivalent standard loads for design and analysis purposes.