Petaflop is a unit of measurement used to measure the performance of floating point unit, or FPU Processor. It can also be written as "petaFLOPS" or "PFLOPS." Since FLOPS stands for "Floating Point Operations Per Second", the term "petaflops" can be either singular (one petaflop) or multiple (two or more petaflops.) A petaflop is equal to 1,000 teraflops, or 1,000,000,000,000,000 FLOPS.

Petaflops are rarely used to measure the performance of a single computer, since only the fastest supercomputers run more than one petaflops. Therefore petaflops are most commonly used for the calculation of the processing power of multiple computers. In addition, since only measures flops floating point calculations, petaflops is not necessarily a good indicator of the overall performance of a computer. Other factors, such as the clock speed of the processor, the system bus speed, and the amount of RAM memory can also affect the speed at which the computer can perform calculations