The parity of a binary number is based on whether it contains an even or odd number of 1 (or set) bits. This means a number has odd parity if the number of 1 bits in the binary number is an odd number. Similarly, a number has even parity if the number of 1 bits in the binary number is an even number. Parity is used to ensure that data is transmitted without error, and other tasks regarding error detection and correction. This calculator is meant to make calculating parity a lot easier!