If an organism's diploid number is 12, its haploid number is 6. The haploid number is typically half the diploid number. The haploid number reflects the number of chromosomes making up a complete set found in the nucleus of a cell.
Different organisms have different numbers of chromosomes making up a complete set. In humans, one set contains 23 chromosomes, so the haploid number for humans is 23. Haploid cells are the result of meiosis. Human sex cells are haploid, but all other cells in the body are diploid. Diploid cells have two complete sets of chromosomes, one set donated from each parent. In humans, that number is 46.