Cardiovascular endurance is an important component in physical fitness in which the heart system, blood vessels and lungs function optimally in a state of rest and work in taking oxygen and channeling oxygen to the active tissue so that it can be used in the body's metabolic processes. The decline in the cardiovascular work system causes the heart-lung system not to work optimally, this will lead to the onset of degenerative diseases, namely low physical activity which will usually affect heart disease, chest pain and stroke. Harvard Bench Test (Harvard Step Test) is a method often used to measure the ability of cardiovascular endurance. This study was conducted at Harvard University, USA, so this test started with the name Harvard. This method uses a stopwatch, metronome, stethoscope and calculator for calculating the fitness index formula by going up and down the bench for 5 minutes then testing the pulse for 3 times, calculating formulas and looking at a table of fitness categories. In this final project, the Harvard step test is made easier with an ATMega8 microcontroller-based device, automatically guiding the test sequence starting from the up and down of the bench to the end of the fitness category. pulse using the finger sensor and therein there are calculation formula program, table of fitness category and viewer media using 2x16 LCD. The results of the tool performance testing by measuring the fitness index value obtained an average comparison of 44,76 and an average of 44,91 tools. It was concluded that this tool could function properly.